From f0938109f995adf7b4b0b4adbe652d9881549cee Mon Sep 17 00:00:00 2001 From: Peter Eisentraut Date: Wed, 30 Aug 2017 23:38:08 -0400 Subject: [PATCH] Generated columns This is an SQL-standard feature that allows creating columns that are computed from expressions rather than assigned, similar to a view but on a column basis. --- doc/src/sgml/catalogs.sgml | 11 + doc/src/sgml/information_schema.sgml | 10 +- doc/src/sgml/ref/copy.sgml | 3 +- doc/src/sgml/ref/create_table.sgml | 46 +++- src/backend/access/common/tupdesc.c | 5 + src/backend/catalog/genbki.pl | 3 + src/backend/catalog/heap.c | 93 +++++-- src/backend/catalog/index.c | 1 + src/backend/catalog/information_schema.sql | 8 +- src/backend/commands/copy.c | 12 +- src/backend/commands/indexcmds.c | 24 +- src/backend/commands/tablecmds.c | 45 +++- src/backend/commands/trigger.c | 36 +++ src/backend/commands/typecmds.c | 6 +- src/backend/executor/execMain.c | 7 +- src/backend/nodes/copyfuncs.c | 2 + src/backend/nodes/equalfuncs.c | 2 + src/backend/nodes/outfuncs.c | 9 + src/backend/parser/gram.y | 26 +- src/backend/parser/parse_agg.c | 11 + src/backend/parser/parse_expr.c | 5 + src/backend/parser/parse_func.c | 12 + src/backend/parser/parse_utilcmd.c | 87 ++++++- src/backend/replication/logical/worker.c | 2 +- src/backend/rewrite/rewriteHandler.c | 122 +++++++++- src/backend/utils/cache/lsyscache.c | 32 +++ src/backend/utils/cache/relcache.c | 1 + src/bin/pg_dump/pg_dump.c | 39 ++- src/bin/pg_dump/pg_dump.h | 1 + src/bin/pg_dump/t/002_pg_dump.pl | 39 +++ src/bin/psql/describe.c | 28 ++- src/include/catalog/catversion.h | 2 +- src/include/catalog/heap.h | 5 +- src/include/catalog/pg_attribute.h | 23 +- src/include/catalog/pg_class.h | 2 +- src/include/nodes/parsenodes.h | 12 +- src/include/parser/kwlist.h | 2 + src/include/parser/parse_node.h | 3 +- src/include/rewrite/rewriteHandler.h | 3 +- src/include/utils/lsyscache.h | 1 + src/test/regress/expected/create_table_like.out | 46 ++++ src/test/regress/expected/generated.out | 309 ++++++++++++++++++++++++ src/test/regress/parallel_schedule | 2 +- src/test/regress/serial_schedule | 1 + src/test/regress/sql/create_table_like.sql | 14 ++ src/test/regress/sql/generated.sql | 192 +++++++++++++++ 46 files changed, 1262 insertions(+), 83 deletions(-) create mode 100644 src/test/regress/expected/generated.out create mode 100644 src/test/regress/sql/generated.sql diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml index ef7054cf26..f5fb5e9291 100644 --- a/doc/src/sgml/catalogs.sgml +++ b/doc/src/sgml/catalogs.sgml @@ -1140,6 +1140,17 @@ <structname>pg_attribute</> Columns + + attgenerated + char + + + If a zero byte (''), then not a generated column. + Otherwise, s = stored, v = + virtual. + + + attisdropped bool diff --git a/doc/src/sgml/information_schema.sgml b/doc/src/sgml/information_schema.sgml index e07ff35bca..3b7dd3ac17 100644 --- a/doc/src/sgml/information_schema.sgml +++ b/doc/src/sgml/information_schema.sgml @@ -1648,13 +1648,19 @@ <literal>columns</literal> Columns is_generated character_data - Applies to a feature not available in PostgreSQL + + If the column is a generated column, then ALWAYS, + else NEVER. + generation_expression character_data - Applies to a feature not available in PostgreSQL + + If the column is a generated column, then the generation expression, + else null. + diff --git a/doc/src/sgml/ref/copy.sgml b/doc/src/sgml/ref/copy.sgml index 8de1150dfb..f08fc7d518 100644 --- a/doc/src/sgml/ref/copy.sgml +++ b/doc/src/sgml/ref/copy.sgml @@ -103,7 +103,8 @@ Parameters An optional list of columns to be copied. If no column list is - specified, all columns of the table will be copied. + specified, all columns of the table excepted generated columns will be + copied. diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml index e9c2c49533..a0e9751a93 100644 --- a/doc/src/sgml/ref/create_table.sgml +++ b/doc/src/sgml/ref/create_table.sgml @@ -62,6 +62,7 @@ NULL | CHECK ( expression ) [ NO INHERIT ] | DEFAULT default_expr | + GENERATED ALWAYS AS ( generation_expr ) [ VIRTUAL | STORED ] | GENERATED { ALWAYS | BY DEFAULT } AS IDENTITY [ ( sequence_options ) ] | UNIQUE index_parameters | PRIMARY KEY index_parameters | @@ -82,7 +83,7 @@ and like_option is: -{ INCLUDING | EXCLUDING } { DEFAULTS | CONSTRAINTS | IDENTITY | INDEXES | STORAGE | COMMENTS | ALL } +{ INCLUDING | EXCLUDING } { DEFAULTS | CONSTRAINTS | IDENTITY | GENERATED | INDEXES | STORAGE | COMMENTS | ALL } and partition_bound_spec is: @@ -530,6 +531,12 @@ Parameters sequence is created for each identity column of the new table, separate from the sequences associated with the old table. + + Generated columns will only become generated columns in the new table + if INCLUDING GENERATED is specified, which will copy + the generation expression and the virtual/stored choice. Otherwise, the + new column will be a regular base column. + Not-null constraints are always copied to the new table. CHECK constraints will be copied only if @@ -562,7 +569,7 @@ Parameters INCLUDING ALL is an abbreviated form of - INCLUDING DEFAULTS INCLUDING IDENTITY INCLUDING CONSTRAINTS INCLUDING INDEXES INCLUDING STORAGE INCLUDING COMMENTS. + INCLUDING DEFAULTS INCLUDING IDENTITY INCLUDING GENERATED INCLUDING CONSTRAINTS INCLUDING INDEXES INCLUDING STORAGE INCLUDING COMMENTS. Note that unlike INHERITS, columns and @@ -676,6 +683,31 @@ Parameters + + GENERATED ALWAYS AS ( generation_expr ) [ VIRTUAL | STORED ]generated column + + + This clause creates the column as a generated + column. The column cannot be written to, and when read it + will be computed from the specified expression. + + + + When VIRTUAL is specified, the column will be + computed when it is read, and it will not occupy any storage. + When STORED is specified, the column will be computed + on write and will be stored on disk. VIRTUAL is the + default. + + + + The generation expression can refer to other columns in the table, but + not other generated columns. Any functions and operators used must be + immutable. References to other tables are not allowed. + + + + GENERATED { ALWAYS | BY DEFAULT } AS IDENTITY [ ( sequence_options ) ] @@ -1832,6 +1864,16 @@ Multiple Identity Columns + + Generated Columns + + + The options VIRTUAL and STORED are + not standard but are also used by other SQL implementations. The SQL + standard does not specify the storage of generated columns. + + + <literal>LIKE</> Clause diff --git a/src/backend/access/common/tupdesc.c b/src/backend/access/common/tupdesc.c index 4436c86361..aae3735697 100644 --- a/src/backend/access/common/tupdesc.c +++ b/src/backend/access/common/tupdesc.c @@ -114,6 +114,7 @@ CreateTupleDescCopy(TupleDesc tupdesc) att->attnotnull = false; att->atthasdef = false; att->attidentity = '\0'; + att->attgenerated = '\0'; } desc->tdtypeid = tupdesc->tdtypeid; @@ -226,6 +227,7 @@ TupleDescCopyEntry(TupleDesc dst, AttrNumber dstAttno, dstAtt->attnotnull = false; dstAtt->atthasdef = false; dstAtt->attidentity = '\0'; + dstAtt->attgenerated = '\0'; } /* @@ -372,6 +374,8 @@ equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2) return false; if (attr1->attidentity != attr2->attidentity) return false; + if (attr1->attgenerated != attr2->attgenerated) + return false; if (attr1->attisdropped != attr2->attisdropped) return false; if (attr1->attislocal != attr2->attislocal) @@ -531,6 +535,7 @@ TupleDescInitEntry(TupleDesc desc, att->attnotnull = false; att->atthasdef = false; att->attidentity = '\0'; + att->attgenerated = '\0'; att->attisdropped = false; att->attislocal = true; att->attinhcount = 0; diff --git a/src/backend/catalog/genbki.pl b/src/backend/catalog/genbki.pl index 2eebb061b7..8a2b79e972 100644 --- a/src/backend/catalog/genbki.pl +++ b/src/backend/catalog/genbki.pl @@ -446,6 +446,7 @@ sub emit_pgattr_row atttypmod => '-1', atthasdef => 'f', attidentity => '', + attgenerated => '', attisdropped => 'f', attislocal => 't', attinhcount => '0', @@ -475,12 +476,14 @@ sub emit_schemapg_row # Replace empty string by zero char constant $row->{attidentity} ||= '\0'; + $row->{attgenerated} ||= '\0'; # Supply appropriate quoting for these fields. $row->{attname} = q|{"| . $row->{attname} . q|"}|; $row->{attstorage} = q|'| . $row->{attstorage} . q|'|; $row->{attalign} = q|'| . $row->{attalign} . q|'|; $row->{attidentity} = q|'| . $row->{attidentity} . q|'|; + $row->{attgenerated} = q|'| . $row->{attgenerated} . q|'|; # We don't emit initializers for the variable length fields at all. # Only the fixed-size portions of the descriptors are ever used. diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c index 45ee9ac8b9..441ef7d637 100644 --- a/src/backend/catalog/heap.c +++ b/src/backend/catalog/heap.c @@ -67,6 +67,7 @@ #include "parser/parse_collate.h" #include "parser/parse_expr.h" #include "parser/parse_relation.h" +#include "parser/parsetree.h" #include "storage/lmgr.h" #include "storage/predicate.h" #include "storage/smgr.h" @@ -144,37 +145,37 @@ static List *insert_ordered_unique_oid(List *list, Oid datum); static FormData_pg_attribute a1 = { 0, {"ctid"}, TIDOID, 0, sizeof(ItemPointerData), SelfItemPointerAttributeNumber, 0, -1, -1, - false, 'p', 's', true, false, '\0', false, true, 0 + false, 'p', 's', true, false, '\0', '\0', false, true, 0 }; static FormData_pg_attribute a2 = { 0, {"oid"}, OIDOID, 0, sizeof(Oid), ObjectIdAttributeNumber, 0, -1, -1, - true, 'p', 'i', true, false, '\0', false, true, 0 + true, 'p', 'i', true, false, '\0', '\0', false, true, 0 }; static FormData_pg_attribute a3 = { 0, {"xmin"}, XIDOID, 0, sizeof(TransactionId), MinTransactionIdAttributeNumber, 0, -1, -1, - true, 'p', 'i', true, false, '\0', false, true, 0 + true, 'p', 'i', true, false, '\0', '\0', false, true, 0 }; static FormData_pg_attribute a4 = { 0, {"cmin"}, CIDOID, 0, sizeof(CommandId), MinCommandIdAttributeNumber, 0, -1, -1, - true, 'p', 'i', true, false, '\0', false, true, 0 + true, 'p', 'i', true, false, '\0', '\0', false, true, 0 }; static FormData_pg_attribute a5 = { 0, {"xmax"}, XIDOID, 0, sizeof(TransactionId), MaxTransactionIdAttributeNumber, 0, -1, -1, - true, 'p', 'i', true, false, '\0', false, true, 0 + true, 'p', 'i', true, false, '\0', '\0', false, true, 0 }; static FormData_pg_attribute a6 = { 0, {"cmax"}, CIDOID, 0, sizeof(CommandId), MaxCommandIdAttributeNumber, 0, -1, -1, - true, 'p', 'i', true, false, '\0', false, true, 0 + true, 'p', 'i', true, false, '\0', '\0', false, true, 0 }; /* @@ -186,7 +187,7 @@ static FormData_pg_attribute a6 = { static FormData_pg_attribute a7 = { 0, {"tableoid"}, OIDOID, 0, sizeof(Oid), TableOidAttributeNumber, 0, -1, -1, - true, 'p', 'i', true, false, '\0', false, true, 0 + true, 'p', 'i', true, false, '\0', '\0', false, true, 0 }; static const Form_pg_attribute SysAtt[] = {&a1, &a2, &a3, &a4, &a5, &a6, &a7}; @@ -624,6 +625,7 @@ InsertPgAttributeTuple(Relation pg_attribute_rel, values[Anum_pg_attribute_attnotnull - 1] = BoolGetDatum(new_attribute->attnotnull); values[Anum_pg_attribute_atthasdef - 1] = BoolGetDatum(new_attribute->atthasdef); values[Anum_pg_attribute_attidentity - 1] = CharGetDatum(new_attribute->attidentity); + values[Anum_pg_attribute_attgenerated - 1] = CharGetDatum(new_attribute->attgenerated); values[Anum_pg_attribute_attisdropped - 1] = BoolGetDatum(new_attribute->attisdropped); values[Anum_pg_attribute_attislocal - 1] = BoolGetDatum(new_attribute->attislocal); values[Anum_pg_attribute_attinhcount - 1] = Int32GetDatum(new_attribute->attinhcount); @@ -1901,7 +1903,7 @@ heap_drop_with_catalog(Oid relid) */ Oid StoreAttrDefault(Relation rel, AttrNumber attnum, - Node *expr, bool is_internal) + Node *expr, bool is_internal, bool generated_col) { char *adbin; char *adsrc; @@ -1988,7 +1990,22 @@ StoreAttrDefault(Relation rel, AttrNumber attnum, /* * Record dependencies on objects used in the expression, too. */ - recordDependencyOnExpr(&defobject, expr, NIL, DEPENDENCY_NORMAL); + if (generated_col) + /* + * Generated column: Dropping anything that the generation expression + * refers automatically drops the generated column. + */ + recordDependencyOnSingleRelExpr(&colobject, expr, RelationGetRelid(rel), + DEPENDENCY_AUTO, + DEPENDENCY_AUTO, false); + else + /* + * Normal default: Dropping anything that the default refers to + * requires CASCADE and drops the default only. + */ + recordDependencyOnSingleRelExpr(&defobject, expr, RelationGetRelid(rel), + DEPENDENCY_NORMAL, + DEPENDENCY_NORMAL, false); /* * Post creation hook for attribute defaults. @@ -2153,7 +2170,7 @@ StoreConstraints(Relation rel, List *cooked_constraints, bool is_internal) { case CONSTR_DEFAULT: con->conoid = StoreAttrDefault(rel, con->attnum, con->expr, - is_internal); + is_internal, false); break; case CONSTR_CHECK: con->conoid = @@ -2252,7 +2269,8 @@ AddRelationNewConstraints(Relation rel, expr = cookDefault(pstate, colDef->raw_default, atp->atttypid, atp->atttypmod, - NameStr(atp->attname)); + NameStr(atp->attname), + atp->attgenerated); /* * If the expression is just a NULL constant, we do not bother to make @@ -2269,7 +2287,8 @@ AddRelationNewConstraints(Relation rel, (IsA(expr, Const) &&((Const *) expr)->constisnull)) continue; - defOid = StoreAttrDefault(rel, colDef->attnum, expr, is_internal); + defOid = StoreAttrDefault(rel, colDef->attnum, expr, is_internal, + (atp->attgenerated != '\0')); cooked = (CookedConstraint *) palloc(sizeof(CookedConstraint)); cooked->contype = CONSTR_DEFAULT; @@ -2617,6 +2636,46 @@ SetRelationNumChecks(Relation rel, int numchecks) heap_close(relrel, RowExclusiveLock); } +/* + * Check for references to generated columns + */ +static bool +check_nested_generated_walker(Node *node, void *context) +{ + ParseState *pstate = context; + + if (node == NULL) + return false; + else if (IsA(node, Var)) + { + Var *var = (Var *) node; + Oid relid; + AttrNumber attnum; + + relid = getrelid(var->varno, pstate->p_rtable); + attnum = var->varattno; + + if (relid && attnum && get_attgenerated(relid, attnum)) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("cannot use generated column \"%s\" in column generation expression", + get_attname(relid, attnum)), + errdetail("A generated column cannot reference another generated column."), + parser_errposition(pstate, var->location))); + + return false; + } + else + return expression_tree_walker(node, check_nested_generated_walker, + (void *) context); +} + +static void +check_nested_generated(ParseState *pstate, Node *node) +{ + check_nested_generated_walker(node, pstate); +} + /* * Take a raw default and convert it to a cooked format ready for * storage. @@ -2634,7 +2693,8 @@ cookDefault(ParseState *pstate, Node *raw_default, Oid atttypid, int32 atttypmod, - char *attname) + char *attname, + char attgenerated) { Node *expr; @@ -2643,17 +2703,20 @@ cookDefault(ParseState *pstate, /* * Transform raw parsetree to executable expression. */ - expr = transformExpr(pstate, raw_default, EXPR_KIND_COLUMN_DEFAULT); + expr = transformExpr(pstate, raw_default, attgenerated ? EXPR_KIND_GENERATED_COLUMN : EXPR_KIND_COLUMN_DEFAULT); /* * Make sure default expr does not refer to any vars (we need this check * since the pstate includes the target table). */ - if (contain_var_clause(expr)) + if (!attgenerated && contain_var_clause(expr)) ereport(ERROR, (errcode(ERRCODE_INVALID_COLUMN_REFERENCE), errmsg("cannot use column references in default expression"))); + if (attgenerated) + check_nested_generated(pstate, expr); + /* * transformExpr() should have already rejected subqueries, aggregates, * window functions, and SRFs, based on the EXPR_KIND_ for a default diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c index c7b2f031f0..7b8ca2ce6f 100644 --- a/src/backend/catalog/index.c +++ b/src/backend/catalog/index.c @@ -354,6 +354,7 @@ ConstructTupleDescriptor(Relation heapRelation, to->attnotnull = false; to->atthasdef = false; to->attidentity = '\0'; + to->attgenerated = '\0'; to->attislocal = true; to->attinhcount = 0; to->attcollation = collationObjectId[i]; diff --git a/src/backend/catalog/information_schema.sql b/src/backend/catalog/information_schema.sql index 236f6be37e..f0c8b2dec8 100644 --- a/src/backend/catalog/information_schema.sql +++ b/src/backend/catalog/information_schema.sql @@ -299,7 +299,7 @@ CREATE VIEW attributes AS CAST(c.relname AS sql_identifier) AS udt_name, CAST(a.attname AS sql_identifier) AS attribute_name, CAST(a.attnum AS cardinal_number) AS ordinal_position, - CAST(pg_get_expr(ad.adbin, ad.adrelid) AS character_data) AS attribute_default, + CAST(pg_get_expr(ad.adbin, ad.adrelid, true) AS character_data) AS attribute_default, CAST(CASE WHEN a.attnotnull OR (t.typtype = 'd' AND t.typnotnull) THEN 'NO' ELSE 'YES' END AS yes_or_no) AS is_nullable, -- This column was apparently removed between SQL:2003 and SQL:2008. @@ -656,7 +656,7 @@ CREATE VIEW columns AS CAST(c.relname AS sql_identifier) AS table_name, CAST(a.attname AS sql_identifier) AS column_name, CAST(a.attnum AS cardinal_number) AS ordinal_position, - CAST(pg_get_expr(ad.adbin, ad.adrelid) AS character_data) AS column_default, + CAST(CASE WHEN a.attgenerated = '' THEN pg_get_expr(ad.adbin, ad.adrelid, true) END AS character_data) AS column_default, CAST(CASE WHEN a.attnotnull OR (t.typtype = 'd' AND t.typnotnull) THEN 'NO' ELSE 'YES' END AS yes_or_no) AS is_nullable, @@ -745,8 +745,8 @@ CREATE VIEW columns AS CAST(seq.seqmin AS character_data) AS identity_minimum, CAST(CASE WHEN seq.seqcycle THEN 'YES' ELSE 'NO' END AS yes_or_no) AS identity_cycle, - CAST('NEVER' AS character_data) AS is_generated, - CAST(null AS character_data) AS generation_expression, + CAST(CASE WHEN a.attgenerated <> '' THEN 'ALWAYS' ELSE 'NEVER' END AS character_data) AS is_generated, + CAST(CASE WHEN a.attgenerated <> '' THEN pg_get_expr(ad.adbin, ad.adrelid, true) END AS character_data) AS generation_expression, CAST(CASE WHEN c.relkind IN ('r', 'p') OR (c.relkind IN ('v', 'f') AND diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c index cfa3f059c2..13e2a15d86 100644 --- a/src/backend/commands/copy.c +++ b/src/backend/commands/copy.c @@ -3039,12 +3039,12 @@ BeginCopyFrom(ParseState *pstate, fmgr_info(in_func_oid, &in_functions[attnum - 1]); /* Get default info if needed */ - if (!list_member_int(cstate->attnumlist, attnum)) + if (!list_member_int(cstate->attnumlist, attnum) && !att->attgenerated) { /* attribute is NOT to be copied from input */ /* use default value if one exists */ Expr *defexpr = (Expr *) build_column_default(cstate->rel, - attnum); + attnum, true); if (defexpr != NULL) { @@ -4719,6 +4719,8 @@ CopyGetAttnums(TupleDesc tupDesc, Relation rel, List *attnamelist) { if (TupleDescAttr(tupDesc, i)->attisdropped) continue; + if (TupleDescAttr(tupDesc, i)->attgenerated) + continue; /* TODO: could be a COPY option */ attnums = lappend_int(attnums, i + 1); } } @@ -4743,6 +4745,12 @@ CopyGetAttnums(TupleDesc tupDesc, Relation rel, List *attnamelist) continue; if (namestrcmp(&(att->attname), name) == 0) { + if (att->attgenerated) + ereport(ERROR, + (errcode(ERRCODE_INVALID_COLUMN_REFERENCE), + errmsg("column \"%s\" is a generated column", + name), + errdetail("Generated columns cannot be used in COPY."))); attnum = att->attnum; break; } diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c index b61aaac284..655a58e4d8 100644 --- a/src/backend/commands/indexcmds.c +++ b/src/backend/commands/indexcmds.c @@ -596,6 +596,8 @@ DefineIndex(Oid relationId, /* * We disallow indexes on system columns other than OID. They would not * necessarily get updated correctly, and they don't seem useful anyway. + * + * Also disallow generated columns in indexes. (could be implemented) */ for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++) { @@ -605,10 +607,16 @@ DefineIndex(Oid relationId, ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("index creation on system columns is not supported"))); + + if (get_attgenerated(relationId, attno)) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("index creation on generated columns is not supported"))); } /* - * Also check for system columns used in expressions or predicates. + * Also check for system and generated columns used in expressions or + * predicates. */ if (indexInfo->ii_Expressions || indexInfo->ii_Predicate) { @@ -617,14 +625,20 @@ DefineIndex(Oid relationId, pull_varattnos((Node *) indexInfo->ii_Expressions, 1, &indexattrs); pull_varattnos((Node *) indexInfo->ii_Predicate, 1, &indexattrs); - for (i = FirstLowInvalidHeapAttributeNumber + 1; i < 0; i++) + i = -1; + while ((i = bms_next_member(indexattrs, i)) >= 0) { - if (i != ObjectIdAttributeNumber && - bms_is_member(i - FirstLowInvalidHeapAttributeNumber, - indexattrs)) + AttrNumber attno = i + FirstLowInvalidHeapAttributeNumber; + + if (attno < 0 && attno != ObjectIdAttributeNumber) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("index creation on system columns is not supported"))); + + if (get_attgenerated(relationId, attno)) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("index creation on generated columns is not supported"))); } } diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 0f08245a67..60cdd936b3 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -722,6 +722,9 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId, if (colDef->identity) attr->attidentity = colDef->identity; + + if (colDef->generated) + attr->attgenerated = colDef->generated; } /* @@ -5270,6 +5273,7 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel, attribute.attnotnull = colDef->is_not_null; attribute.atthasdef = false; attribute.attidentity = colDef->identity; + attribute.attgenerated = colDef->generated; attribute.attisdropped = false; attribute.attislocal = colDef->is_local; attribute.attinhcount = colDef->inhcount; @@ -5355,7 +5359,7 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel, if (relkind != RELKIND_VIEW && relkind != RELKIND_COMPOSITE_TYPE && relkind != RELKIND_FOREIGN_TABLE && attribute.attnum > 0) { - defval = (Expr *) build_column_default(rel, attribute.attnum); + defval = (Expr *) build_column_default(rel, attribute.attnum, true); if (!defval && DomainHasConstraints(typeOid)) { @@ -7147,6 +7151,41 @@ ATAddForeignKeyConstraint(AlteredTableInfo *tab, Relation rel, */ checkFkeyPermissions(pkrel, pkattnum, numpks); + /* + * Foreign keys on generated columns are not yet implemented. + */ + for (i = 0; i < numpks; i++) + { + if (get_attgenerated(RelationGetRelid(pkrel), pkattnum[i])) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("foreign key constraints referencing generated columns are not supported"))); + } + for (i = 0; i < numfks; i++) + { + if (get_attgenerated(RelationGetRelid(rel), fkattnum[i])) + { + /* + * Check restrictions on UPDATE/DELETE actions, per SQL standard + */ + if (fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETNULL || + fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETDEFAULT || + fkconstraint->fk_upd_action == FKCONSTR_ACTION_CASCADE) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("invalid ON UPDATE action for foreign key constraint containing generated column"))); + if (fkconstraint->fk_del_action == FKCONSTR_ACTION_SETNULL || + fkconstraint->fk_del_action == FKCONSTR_ACTION_SETDEFAULT) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("invalid ON DELETE action for foreign key constraint containing generated column"))); + + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("foreign key constraints on generated columns are not supported"))); + } + } + /* * Look up the equality operators to use in the constraint. * @@ -9031,7 +9070,7 @@ ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel, */ if (attTup->atthasdef) { - defaultexpr = build_column_default(rel, attnum); + defaultexpr = build_column_default(rel, attnum, true); Assert(defaultexpr); defaultexpr = strip_implicit_coercions(defaultexpr); defaultexpr = coerce_to_target_type(NULL, /* no UNKNOWN params */ @@ -9372,7 +9411,7 @@ ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel, RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, true, true); - StoreAttrDefault(rel, attnum, defaultexpr, true); + StoreAttrDefault(rel, attnum, defaultexpr, true, false); } ObjectAddressSubSet(address, RelationRelationId, diff --git a/src/backend/commands/trigger.c b/src/backend/commands/trigger.c index da0850bfd6..853db162d2 100644 --- a/src/backend/commands/trigger.c +++ b/src/backend/commands/trigger.c @@ -43,6 +43,7 @@ #include "parser/parse_relation.h" #include "parser/parsetree.h" #include "pgstat.h" +#include "rewrite/rewriteHandler.h" #include "rewrite/rewriteManip.h" #include "storage/bufmgr.h" #include "storage/lmgr.h" @@ -100,6 +101,7 @@ static void AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo, List *recheckIndexes, Bitmapset *modifiedCols, TransitionCaptureState *transition_capture); static void AfterTriggerEnlargeQueryState(void); +static void check_modified_virtual_generated(TupleDesc tupdesc, HeapTuple tuple); /* @@ -536,6 +538,11 @@ CreateTrigger(CreateTrigStmt *stmt, const char *queryString, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("BEFORE trigger's WHEN condition cannot reference NEW system columns"), parser_errposition(pstate, var->location))); + if (get_attgenerated(RelationGetRelid(rel), var->varattno) && TRIGGER_FOR_BEFORE(tgtype)) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("BEFORE trigger's WHEN condition cannot reference NEW generated columns"), + parser_errposition(pstate, var->location))); break; default: /* can't happen without add_missing_from, so just elog */ @@ -2401,6 +2408,8 @@ ExecBRInsertTriggers(EState *estate, ResultRelInfo *relinfo, TupleTableSlot *newslot = estate->es_trig_tuple_slot; TupleDesc tupdesc = RelationGetDescr(relinfo->ri_RelationDesc); + check_modified_virtual_generated(tupdesc, newtuple); + if (newslot->tts_tupleDescriptor != tupdesc) ExecSetSlotDescriptor(newslot, tupdesc); ExecStoreTuple(newtuple, newslot, InvalidBuffer, false); @@ -2878,6 +2887,8 @@ ExecBRUpdateTriggers(EState *estate, EPQState *epqstate, TupleTableSlot *newslot = estate->es_trig_tuple_slot; TupleDesc tupdesc = RelationGetDescr(relinfo->ri_RelationDesc); + check_modified_virtual_generated(tupdesc, newtuple); + if (newslot->tts_tupleDescriptor != tupdesc) ExecSetSlotDescriptor(newslot, tupdesc); ExecStoreTuple(newtuple, newslot, InvalidBuffer, false); @@ -3270,6 +3281,7 @@ TriggerEnabled(EState *estate, ResultRelInfo *relinfo, oldContext = MemoryContextSwitchTo(estate->es_query_cxt); tgqual = stringToNode(trigger->tgqual); + tgqual = (Node *) expand_generated_columns_in_expr((Expr *) tgqual, relinfo->ri_RelationDesc); /* Change references to OLD and NEW to INNER_VAR and OUTER_VAR */ ChangeVarNodes(tgqual, PRS2_OLD_VARNO, INNER_VAR, 0); ChangeVarNodes(tgqual, PRS2_NEW_VARNO, OUTER_VAR, 0); @@ -5499,3 +5511,27 @@ pg_trigger_depth(PG_FUNCTION_ARGS) { PG_RETURN_INT32(MyTriggerDepth); } + +/* + * Check whether a trigger modified a virtual generated column and error if + * so. + */ +static void +check_modified_virtual_generated(TupleDesc tupdesc, HeapTuple tuple) +{ + int i; + + for (i = 0; i < tupdesc->natts; i++) + { + if (TupleDescAttr(tupdesc, i)->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL) + { + bool isnull; + + fastgetattr(tuple, i + 1, tupdesc, &isnull); + if (!isnull) + ereport(ERROR, + (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED), + errmsg("trigger modified virtual generated column value"))); + } + } +} diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c index 7ed16aeff4..25abcee86b 100644 --- a/src/backend/commands/typecmds.c +++ b/src/backend/commands/typecmds.c @@ -912,7 +912,8 @@ DefineDomain(CreateDomainStmt *stmt) defaultExpr = cookDefault(pstate, constr->raw_expr, basetypeoid, basetypeMod, - domainName); + domainName, + 0); /* * If the expression is just a NULL constant, we treat it @@ -2172,7 +2173,8 @@ AlterDomainDefault(List *names, Node *defaultRaw) defaultExpr = cookDefault(pstate, defaultRaw, typTup->typbasetype, typTup->typtypmod, - NameStr(typTup->typname)); + NameStr(typTup->typname), + 0); /* * If the expression is just a NULL constant, we treat the command diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c index 2946a0edee..4ed838abec 100644 --- a/src/backend/executor/execMain.c +++ b/src/backend/executor/execMain.c @@ -53,7 +53,7 @@ #include "miscadmin.h" #include "optimizer/clauses.h" #include "parser/parsetree.h" -#include "rewrite/rewriteManip.h" +#include "rewrite/rewriteHandler.h" #include "storage/bufmgr.h" #include "storage/lmgr.h" #include "tcop/utility.h" @@ -1807,6 +1807,7 @@ ExecRelCheck(ResultRelInfo *resultRelInfo, Expr *checkconstr; checkconstr = stringToNode(check[i].ccbin); + checkconstr = expand_generated_columns_in_expr(checkconstr, rel); resultRelInfo->ri_ConstraintExprs[i] = ExecPrepareExpr(checkconstr, estate); } @@ -2268,6 +2269,10 @@ ExecBuildSlotValueDescription(Oid reloid, if (att->attisdropped) continue; + /* ignore virtual generated columns; they are always null here */ + if (att->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL) + continue; + if (!table_perm) { /* diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c index f9ddf4ed76..8ceaa556bc 100644 --- a/src/backend/nodes/copyfuncs.c +++ b/src/backend/nodes/copyfuncs.c @@ -2814,6 +2814,7 @@ _copyColumnDef(const ColumnDef *from) COPY_NODE_FIELD(raw_default); COPY_NODE_FIELD(cooked_default); COPY_SCALAR_FIELD(identity); + COPY_SCALAR_FIELD(generated); COPY_NODE_FIELD(collClause); COPY_SCALAR_FIELD(collOid); COPY_NODE_FIELD(constraints); @@ -2837,6 +2838,7 @@ _copyConstraint(const Constraint *from) COPY_NODE_FIELD(raw_expr); COPY_STRING_FIELD(cooked_expr); COPY_SCALAR_FIELD(generated_when); + COPY_SCALAR_FIELD(generated_kind); COPY_NODE_FIELD(keys); COPY_NODE_FIELD(exclusions); COPY_NODE_FIELD(options); diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c index 8d92c03633..5be63d2f54 100644 --- a/src/backend/nodes/equalfuncs.c +++ b/src/backend/nodes/equalfuncs.c @@ -2544,6 +2544,7 @@ _equalColumnDef(const ColumnDef *a, const ColumnDef *b) COMPARE_NODE_FIELD(raw_default); COMPARE_NODE_FIELD(cooked_default); COMPARE_SCALAR_FIELD(identity); + COMPARE_SCALAR_FIELD(generated); COMPARE_NODE_FIELD(collClause); COMPARE_SCALAR_FIELD(collOid); COMPARE_NODE_FIELD(constraints); @@ -2565,6 +2566,7 @@ _equalConstraint(const Constraint *a, const Constraint *b) COMPARE_NODE_FIELD(raw_expr); COMPARE_STRING_FIELD(cooked_expr); COMPARE_SCALAR_FIELD(generated_when); + COMPARE_SCALAR_FIELD(generated_kind); COMPARE_NODE_FIELD(keys); COMPARE_NODE_FIELD(exclusions); COMPARE_NODE_FIELD(options); diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c index 9ee3e23761..0ff1b00f24 100644 --- a/src/backend/nodes/outfuncs.c +++ b/src/backend/nodes/outfuncs.c @@ -2801,6 +2801,7 @@ _outColumnDef(StringInfo str, const ColumnDef *node) WRITE_NODE_FIELD(raw_default); WRITE_NODE_FIELD(cooked_default); WRITE_CHAR_FIELD(identity); + WRITE_CHAR_FIELD(generated); WRITE_NODE_FIELD(collClause); WRITE_OID_FIELD(collOid); WRITE_NODE_FIELD(constraints); @@ -3452,6 +3453,14 @@ _outConstraint(StringInfo str, const Constraint *node) WRITE_CHAR_FIELD(generated_when); break; + case CONSTR_GENERATED: + appendStringInfoString(str, "GENERATED"); + WRITE_NODE_FIELD(raw_expr); + WRITE_STRING_FIELD(cooked_expr); + WRITE_CHAR_FIELD(generated_when); + WRITE_CHAR_FIELD(generated_kind); + break; + case CONSTR_CHECK: appendStringInfoString(str, "CHECK"); WRITE_BOOL_FIELD(is_no_inherit); diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y index 7d0de99baf..ff586533c6 100644 --- a/src/backend/parser/gram.y +++ b/src/backend/parser/gram.y @@ -570,7 +570,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query); opt_frame_clause frame_extent frame_bound %type opt_existing_window_name %type opt_if_not_exists -%type generated_when override_kind +%type generated_when override_kind opt_virtual_or_stored %type PartitionSpec OptPartitionSpec %type part_strategy %type part_elem @@ -669,7 +669,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query); SAVEPOINT SCHEMA SCHEMAS SCROLL SEARCH SECOND_P SECURITY SELECT SEQUENCE SEQUENCES SERIALIZABLE SERVER SESSION SESSION_USER SET SETS SETOF SHARE SHOW SIMILAR SIMPLE SKIP SMALLINT SNAPSHOT SOME SQL_P STABLE STANDALONE_P - START STATEMENT STATISTICS STDIN STDOUT STORAGE STRICT_P STRIP_P + START STATEMENT STATISTICS STDIN STDOUT STORAGE STORED STRICT_P STRIP_P SUBSCRIPTION SUBSTRING SYMMETRIC SYSID SYSTEM_P TABLE TABLES TABLESAMPLE TABLESPACE TEMP TEMPLATE TEMPORARY TEXT_P THEN @@ -680,7 +680,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query); UNTIL UPDATE USER USING VACUUM VALID VALIDATE VALIDATOR VALUE_P VALUES VARCHAR VARIADIC VARYING - VERBOSE VERSION_P VIEW VIEWS VOLATILE + VERBOSE VERSION_P VIEW VIEWS VIRTUAL VOLATILE WHEN WHERE WHITESPACE_P WINDOW WITH WITHIN WITHOUT WORK WRAPPER WRITE @@ -3403,6 +3403,17 @@ ColConstraintElem: n->location = @1; $$ = (Node *)n; } + | GENERATED generated_when AS '(' a_expr ')' opt_virtual_or_stored + { + Constraint *n = makeNode(Constraint); + n->contype = CONSTR_GENERATED; + n->generated_when = $2; + n->raw_expr = $5; + n->cooked_expr = NULL; + n->generated_kind = $7; + n->location = @1; + $$ = (Node *)n; + } | REFERENCES qualified_name opt_column_list key_match key_actions { Constraint *n = makeNode(Constraint); @@ -3425,6 +3436,12 @@ generated_when: | BY DEFAULT { $$ = ATTRIBUTE_IDENTITY_BY_DEFAULT; } ; +opt_virtual_or_stored: + STORED { $$ = ATTRIBUTE_GENERATED_STORED; } + | VIRTUAL { $$ = ATTRIBUTE_GENERATED_VIRTUAL; } + | /*EMPTY*/ { $$ = ATTRIBUTE_GENERATED_VIRTUAL; } + ; + /* * ConstraintAttr represents constraint attributes, which we parse as if * they were independent constraint clauses, in order to avoid shift/reduce @@ -3492,6 +3509,7 @@ TableLikeOption: DEFAULTS { $$ = CREATE_TABLE_LIKE_DEFAULTS; } | CONSTRAINTS { $$ = CREATE_TABLE_LIKE_CONSTRAINTS; } | IDENTITY_P { $$ = CREATE_TABLE_LIKE_IDENTITY; } + | GENERATED { $$ = CREATE_TABLE_LIKE_GENERATED; } | INDEXES { $$ = CREATE_TABLE_LIKE_INDEXES; } | STORAGE { $$ = CREATE_TABLE_LIKE_STORAGE; } | COMMENTS { $$ = CREATE_TABLE_LIKE_COMMENTS; } @@ -14820,6 +14838,7 @@ unreserved_keyword: | STDIN | STDOUT | STORAGE + | STORED | STRICT_P | STRIP_P | SUBSCRIPTION @@ -14855,6 +14874,7 @@ unreserved_keyword: | VERSION_P | VIEW | VIEWS + | VIRTUAL | VOLATILE | WHITESPACE_P | WITHIN diff --git a/src/backend/parser/parse_agg.c b/src/backend/parser/parse_agg.c index 64111f315e..dc77720e86 100644 --- a/src/backend/parser/parse_agg.c +++ b/src/backend/parser/parse_agg.c @@ -507,6 +507,14 @@ check_agglevels_and_constraints(ParseState *pstate, Node *expr) err = _("grouping operations are not allowed in partition key expression"); break; + case EXPR_KIND_GENERATED_COLUMN: + + if (isAgg) + err = _("aggregate functions are not allowed in column generation expressions"); + else + err = _("grouping operations are not allowed in column generation expressions"); + + break; /* * There is intentionally no default: case here, so that the @@ -883,6 +891,9 @@ transformWindowFuncCall(ParseState *pstate, WindowFunc *wfunc, case EXPR_KIND_PARTITION_EXPRESSION: err = _("window functions are not allowed in partition key expression"); break; + case EXPR_KIND_GENERATED_COLUMN: + err = _("window functions are not allowed in column generation expressions"); + break; /* * There is intentionally no default: case here, so that the diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c index 6d8cb07766..cfaf4f03d6 100644 --- a/src/backend/parser/parse_expr.c +++ b/src/backend/parser/parse_expr.c @@ -1840,6 +1840,9 @@ transformSubLink(ParseState *pstate, SubLink *sublink) case EXPR_KIND_PARTITION_EXPRESSION: err = _("cannot use subquery in partition key expression"); break; + case EXPR_KIND_GENERATED_COLUMN: + err = _("cannot use subquery in column generation expression"); + break; /* * There is intentionally no default: case here, so that the @@ -3462,6 +3465,8 @@ ParseExprKindName(ParseExprKind exprKind) return "WHEN"; case EXPR_KIND_PARTITION_EXPRESSION: return "PARTITION BY"; + case EXPR_KIND_GENERATED_COLUMN: + return "GENERATED AS"; /* * There is intentionally no default: case here, so that the diff --git a/src/backend/parser/parse_func.c b/src/backend/parser/parse_func.c index 2f2f2c7fb0..76d3e1b18e 100644 --- a/src/backend/parser/parse_func.c +++ b/src/backend/parser/parse_func.c @@ -528,6 +528,15 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs, parser_errposition(pstate, location))); } + if (pstate->p_expr_kind == EXPR_KIND_GENERATED_COLUMN && + func_volatile(funcid) != PROVOLATILE_IMMUTABLE) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("cannot use function %s in column generation expression", + func_signature_string(funcname, nargs, argnames, actual_arg_types)), + errdetail("Functions used in a column generation expression must be immutable."), + parser_errposition(pstate, location))); + /* * If there are default arguments, we have to include their types in * actual_arg_types for the purpose of checking generic type consistency. @@ -2235,6 +2244,9 @@ check_srf_call_placement(ParseState *pstate, Node *last_srf, int location) case EXPR_KIND_PARTITION_EXPRESSION: err = _("set-returning functions are not allowed in partition key expressions"); break; + case EXPR_KIND_GENERATED_COLUMN: + err = _("set-returning functions are not allowed in column generation expressions"); + break; /* * There is intentionally no default: case here, so that the diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index 20586797cc..5f6bec5ed1 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -505,6 +505,7 @@ transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column) bool saw_nullable; bool saw_default; bool saw_identity; + bool saw_generated; ListCell *clist; cxt->columns = lappend(cxt->columns, column); @@ -612,6 +613,7 @@ transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column) saw_nullable = false; saw_default = false; saw_identity = false; + saw_generated = false; foreach(clist, column->constraints) { @@ -683,6 +685,41 @@ transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column) break; } + case CONSTR_GENERATED: + if (saw_generated) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("multiple generation clauses specified for column \"%s\" of table \"%s\"", + column->colname, cxt->relation->relname), + parser_errposition(cxt->pstate, + constraint->location))); + column->generated = constraint->generated_kind; + column->raw_default = constraint->raw_expr; + Assert(constraint->cooked_expr == NULL); + saw_generated = true; + + /* + * Prevent virtual generated columns from having a domain + * type. We would have to enforce domain constraints when + * columns underlying the generated column change. This could + * possibly be implemented, but it's not. + */ + if (column->generated == ATTRIBUTE_GENERATED_VIRTUAL) + { + Type ctype; + + ctype = typenameType(cxt->pstate, column->typeName, NULL); + if (((Form_pg_type) GETSTRUCT(ctype))->typtype == TYPTYPE_DOMAIN) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("virtual generated column \"%s\" cannot have a domain type", + column->colname), + parser_errposition(cxt->pstate, + column->location))); + ReleaseSysCache(ctype); + } + break; + case CONSTR_CHECK: cxt->ckconstraints = lappend(cxt->ckconstraints, constraint); break; @@ -767,6 +804,50 @@ transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column) column->colname, cxt->relation->relname), parser_errposition(cxt->pstate, constraint->location))); + + if (saw_default && saw_generated) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("both default and generation expression specified for column \"%s\" of table \"%s\"", + column->colname, cxt->relation->relname), + parser_errposition(cxt->pstate, + constraint->location))); + + if (saw_identity && saw_generated) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("both identity and generation expression specified for column \"%s\" of table \"%s\"", + column->colname, cxt->relation->relname), + parser_errposition(cxt->pstate, + constraint->location))); + + /* + * For a generated column, convert the not-null constraint into a full + * check constraint, so that the generation expression can be expanded + * at check time. + */ + if (column->is_not_null && column->generated) + { + Constraint *chk = makeNode(Constraint); + NullTest *nt = makeNode(NullTest); + ColumnRef *cr = makeNode(ColumnRef); + + cr->location = -1; + cr->fields = list_make1(makeString(column->colname)); + + nt->arg = (Expr *) cr; + nt->nulltesttype = IS_NOT_NULL; + nt->location = -1; + + chk->contype = CONSTR_CHECK; + chk->location = -1; + chk->initially_valid = true; + chk->raw_expr = (Node *) nt; + + cxt->ckconstraints = lappend(cxt->ckconstraints, chk); + + column->is_not_null = false; + } } /* @@ -1014,7 +1095,8 @@ transformTableLikeClause(CreateStmtContext *cxt, TableLikeClause *table_like_cla * Copy default, if present and the default has been requested */ if (attribute->atthasdef && - (table_like_clause->options & CREATE_TABLE_LIKE_DEFAULTS)) + (table_like_clause->options & CREATE_TABLE_LIKE_DEFAULTS || + table_like_clause->options & CREATE_TABLE_LIKE_GENERATED)) { Node *this_default = NULL; AttrDefault *attrdef; @@ -1039,6 +1121,9 @@ transformTableLikeClause(CreateStmtContext *cxt, TableLikeClause *table_like_cla */ def->cooked_default = this_default; + if (attribute->attgenerated && + (table_like_clause->options & CREATE_TABLE_LIKE_GENERATED)) + def->generated = attribute->attgenerated; } /* diff --git a/src/backend/replication/logical/worker.c b/src/backend/replication/logical/worker.c index 041f3873b9..d63121ecf7 100644 --- a/src/backend/replication/logical/worker.c +++ b/src/backend/replication/logical/worker.c @@ -253,7 +253,7 @@ slot_fill_defaults(LogicalRepRelMapEntry *rel, EState *estate, if (rel->attrmap[attnum] >= 0) continue; - defexpr = (Expr *) build_column_default(rel->localrel, attnum + 1); + defexpr = (Expr *) build_column_default(rel->localrel, attnum + 1, true); if (defexpr != NULL) { diff --git a/src/backend/rewrite/rewriteHandler.c b/src/backend/rewrite/rewriteHandler.c index ef52dd5b95..84af18ec8c 100644 --- a/src/backend/rewrite/rewriteHandler.c +++ b/src/backend/rewrite/rewriteHandler.c @@ -20,6 +20,7 @@ */ #include "postgres.h" +#include "access/htup_details.h" #include "access/sysattr.h" #include "catalog/dependency.h" #include "catalog/pg_type.h" @@ -37,6 +38,7 @@ #include "utils/builtins.h" #include "utils/lsyscache.h" #include "utils/rel.h" +#include "utils/syscache.h" /* We use a list of these to detect recursion in RewriteQuery */ @@ -823,6 +825,13 @@ rewriteTargetListIU(List *targetList, if (att_tup->attidentity == ATTRIBUTE_IDENTITY_BY_DEFAULT && override == OVERRIDING_USER_VALUE) apply_default = true; + + if (att_tup->attgenerated && !apply_default) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("cannot insert into column \"%s\"", NameStr(att_tup->attname)), + errdetail("Column \"%s\" is a generated column.", + NameStr(att_tup->attname)))); } if (commandType == CMD_UPDATE) @@ -833,9 +842,28 @@ rewriteTargetListIU(List *targetList, errmsg("column \"%s\" can only be updated to DEFAULT", NameStr(att_tup->attname)), errdetail("Column \"%s\" is an identity column defined as GENERATED ALWAYS.", NameStr(att_tup->attname)))); + + if (att_tup->attgenerated && new_tle && !apply_default) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("column \"%s\" can only be updated to DEFAULT", NameStr(att_tup->attname)), + errdetail("Column \"%s\" is a generated column.", + NameStr(att_tup->attname)))); } - if (apply_default) + if (att_tup->attgenerated) + { + /* + * virtual generated column stores a null value + */ + new_tle = NULL; + + if (att_tup->attgenerated == ATTRIBUTE_GENERATED_STORED) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("stored generated columns are not yet implemented"))); + } + else if (apply_default) { Node *new_expr; @@ -849,7 +877,7 @@ rewriteTargetListIU(List *targetList, new_expr = (Node *) nve; } else - new_expr = build_column_default(target_relation, attrno); + new_expr = build_column_default(target_relation, attrno, true); /* * If there is no default (ie, default is effectively NULL), we @@ -1109,7 +1137,7 @@ get_assignment_input(Node *node) * If there is no default, return a NULL instead. */ Node * -build_column_default(Relation rel, int attrno) +build_column_default(Relation rel, int attrno, bool allow_typdefault) { TupleDesc rd_att = rel->rd_att; Form_pg_attribute att_tup = TupleDescAttr(rd_att, attrno - 1); @@ -1139,7 +1167,7 @@ build_column_default(Relation rel, int attrno) } } - if (expr == NULL) + if (expr == NULL && allow_typdefault) { /* * No per-column default, so look for a default for the type itself. @@ -1250,7 +1278,7 @@ rewriteValuesRTE(RangeTblEntry *rte, Relation target_relation, List *attrnos) att_tup = TupleDescAttr(target_relation->rd_att, attrno - 1); if (!att_tup->attisdropped) - new_expr = build_column_default(target_relation, attrno); + new_expr = build_column_default(target_relation, attrno, true); else new_expr = NULL; /* force a NULL if dropped */ @@ -3563,6 +3591,75 @@ RewriteQuery(Query *parsetree, List *rewrite_events) } +static Node * +expand_generated_columns_in_expr_mutator(Node *node, Relation rel) +{ + if (node == NULL) + return NULL; + + if (IsA(node, Var)) + { + Var *v = (Var *) node; + Oid relid = RelationGetRelid(rel); + AttrNumber attnum = v->varattno; + + if (relid && attnum && get_attgenerated(relid, attnum) == ATTRIBUTE_GENERATED_VIRTUAL) + { + node = build_column_default(rel, attnum, false); + ChangeVarNodes(node, 1, v->varno, 0); + } + + return node; + } + else + return expression_tree_mutator(node, expand_generated_columns_in_expr_mutator, rel); +} + + +Expr * +expand_generated_columns_in_expr(Expr *expr, Relation rel) +{ + return (Expr *) expression_tree_mutator((Node *) expr, + expand_generated_columns_in_expr_mutator, + rel); +} + + +static Node * +expand_generated_columns_in_query_mutator(Node *node, List *rtable) +{ + if (node == NULL) + return NULL; + + if (IsA(node, Var)) + { + Var *v = (Var *) node; + Oid relid; + AttrNumber attnum; + + relid = getrelid(v->varno, rtable); + attnum = v->varattno; + + if (!relid || !attnum) + return node; + + if (get_attgenerated(relid, attnum) == ATTRIBUTE_GENERATED_VIRTUAL) + { + Relation rt_entry_relation = heap_open(relid, NoLock); + + node = build_column_default(rt_entry_relation, attnum, false); + ChangeVarNodes(node, 1, v->varno, 0); + + heap_close(rt_entry_relation, NoLock); + } + + return node; + } + else + return expression_tree_mutator(node, expand_generated_columns_in_query_mutator, rtable); +} + + /* * QueryRewrite - * Primary entry point to the query rewriter. @@ -3618,6 +3715,21 @@ QueryRewrite(Query *parsetree) /* * Step 3 * + * Expand generated columns. + */ + foreach(l, querylist) + { + Query *query = (Query *) lfirst(l); + + query = query_tree_mutator(query, + expand_generated_columns_in_query_mutator, + query->rtable, + QTW_DONT_COPY_QUERY); + } + + /* + * Step 4 + * * Determine which, if any, of the resulting queries is supposed to set * the command-result tag; and update the canSetTag fields accordingly. * diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c index 82763f8013..e0fd0cf8b1 100644 --- a/src/backend/utils/cache/lsyscache.c +++ b/src/backend/utils/cache/lsyscache.c @@ -836,6 +836,38 @@ get_attnum(Oid relid, const char *attname) return InvalidAttrNumber; } +/* + * get_attgenerated + * + * Given the relation id and the attribute name, + * return the "attgenerated" field from the attribute relation. + * + * Returns '\0' if not found. + * + * Since not generated is represented by '\0', this can also be used as a + * Boolean test. + */ +char +get_attgenerated(Oid relid, AttrNumber attnum) +{ + HeapTuple tp; + + tp = SearchSysCache2(ATTNUM, + ObjectIdGetDatum(relid), + Int16GetDatum(attnum)); + if (HeapTupleIsValid(tp)) + { + Form_pg_attribute att_tup = (Form_pg_attribute) GETSTRUCT(tp); + char result; + + result = att_tup->attgenerated; + ReleaseSysCache(tp); + return result; + } + else + return '\0'; +} + /* * get_attidentity * diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c index b8e37809b0..42cf22dd3b 100644 --- a/src/backend/utils/cache/relcache.c +++ b/src/backend/utils/cache/relcache.c @@ -3280,6 +3280,7 @@ RelationBuildLocalRelation(const char *relname, Form_pg_attribute datt = TupleDescAttr(rel->rd_att, i); datt->attidentity = satt->attidentity; + datt->attgenerated = satt->attgenerated; datt->attnotnull = satt->attnotnull; has_not_null |= satt->attnotnull; } diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c index 75f08cd792..88215d14e6 100644 --- a/src/bin/pg_dump/pg_dump.c +++ b/src/bin/pg_dump/pg_dump.c @@ -1970,6 +1970,11 @@ dumpTableData_insert(Archive *fout, void *dcontext) { if (field > 0) archputs(", ", fout); + if (tbinfo->attgenerated[field]) + { + archputs("DEFAULT", fout); + continue; + } if (PQgetisnull(res, tuple, field)) { archputs("NULL", fout); @@ -7846,6 +7851,7 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables) int i_attnotnull; int i_atthasdef; int i_attidentity; + int i_attgenerated; int i_attisdropped; int i_attlen; int i_attalign; @@ -7902,6 +7908,7 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables) "CASE WHEN a.attcollation <> t.typcollation " "THEN a.attcollation ELSE 0 END AS attcollation, " "a.attidentity, " + "a.attgenerated, " "pg_catalog.array_to_string(ARRAY(" "SELECT pg_catalog.quote_ident(option_name) || " "' ' || pg_catalog.quote_literal(option_value) " @@ -8015,6 +8022,7 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables) i_attnotnull = PQfnumber(res, "attnotnull"); i_atthasdef = PQfnumber(res, "atthasdef"); i_attidentity = PQfnumber(res, "attidentity"); + i_attgenerated = PQfnumber(res, "attgenerated"); i_attisdropped = PQfnumber(res, "attisdropped"); i_attlen = PQfnumber(res, "attlen"); i_attalign = PQfnumber(res, "attalign"); @@ -8031,6 +8039,7 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables) tbinfo->attstorage = (char *) pg_malloc(ntups * sizeof(char)); tbinfo->typstorage = (char *) pg_malloc(ntups * sizeof(char)); tbinfo->attidentity = (char *) pg_malloc(ntups * sizeof(char)); + tbinfo->attgenerated = (char *) pg_malloc(ntups * sizeof(char)); tbinfo->attisdropped = (bool *) pg_malloc(ntups * sizeof(bool)); tbinfo->attlen = (int *) pg_malloc(ntups * sizeof(int)); tbinfo->attalign = (char *) pg_malloc(ntups * sizeof(char)); @@ -8056,6 +8065,7 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables) tbinfo->attstorage[j] = *(PQgetvalue(res, j, i_attstorage)); tbinfo->typstorage[j] = *(PQgetvalue(res, j, i_typstorage)); tbinfo->attidentity[j] = (i_attidentity >= 0 ? *(PQgetvalue(res, j, i_attidentity)) : '\0'); + tbinfo->attgenerated[j] = (i_attgenerated >= 0 ? *(PQgetvalue(res, j, i_attgenerated)) : '\0'); tbinfo->needs_override = tbinfo->needs_override || (tbinfo->attidentity[j] == ATTRIBUTE_IDENTITY_ALWAYS); tbinfo->attisdropped[j] = (PQgetvalue(res, j, i_attisdropped)[0] == 't'); tbinfo->attlen[j] = atoi(PQgetvalue(res, j, i_attlen)); @@ -8088,7 +8098,7 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables) tbinfo->dobj.name); printfPQExpBuffer(q, "SELECT tableoid, oid, adnum, " - "pg_catalog.pg_get_expr(adbin, adrelid) AS adsrc " + "pg_catalog.pg_get_expr(adbin, adrelid, true) AS adsrc " "FROM pg_catalog.pg_attrdef " "WHERE adrelid = '%u'::pg_catalog.oid", tbinfo->dobj.catId.oid); @@ -15364,6 +15374,23 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo) tbinfo->atttypnames[j]); } + if (has_default) + { + if (tbinfo->attgenerated[j] == ATTRIBUTE_GENERATED_STORED) + appendPQExpBuffer(q, " GENERATED ALWAYS AS (%s) STORED", + tbinfo->attrdefs[j]->adef_expr); + else if (tbinfo->attgenerated[j] == ATTRIBUTE_GENERATED_VIRTUAL) + appendPQExpBuffer(q, " GENERATED ALWAYS AS (%s)", + tbinfo->attrdefs[j]->adef_expr); + else + appendPQExpBuffer(q, " DEFAULT %s", + tbinfo->attrdefs[j]->adef_expr); + } + + + if (has_notnull) + appendPQExpBufferStr(q, " NOT NULL"); + /* Add collation if not default for the type */ if (OidIsValid(tbinfo->attcollation[j])) { @@ -15378,13 +15405,6 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo) appendPQExpBufferStr(q, fmtId(coll->dobj.name)); } } - - if (has_default) - appendPQExpBuffer(q, " DEFAULT %s", - tbinfo->attrdefs[j]->adef_expr); - - if (has_notnull) - appendPQExpBufferStr(q, " NOT NULL"); } } @@ -17892,6 +17912,7 @@ fmtCopyColumnList(const TableInfo *ti, PQExpBuffer buffer) int numatts = ti->numatts; char **attnames = ti->attnames; bool *attisdropped = ti->attisdropped; + char *attgenerated = ti->attgenerated; bool needComma; int i; @@ -17901,6 +17922,8 @@ fmtCopyColumnList(const TableInfo *ti, PQExpBuffer buffer) { if (attisdropped[i]) continue; + if (attgenerated[i]) + continue; if (needComma) appendPQExpBufferStr(buffer, ", "); appendPQExpBufferStr(buffer, fmtId(attnames[i])); diff --git a/src/bin/pg_dump/pg_dump.h b/src/bin/pg_dump/pg_dump.h index e7593e6da7..1afe7d87c3 100644 --- a/src/bin/pg_dump/pg_dump.h +++ b/src/bin/pg_dump/pg_dump.h @@ -309,6 +309,7 @@ typedef struct _tableInfo char *typstorage; /* type storage scheme */ bool *attisdropped; /* true if attr is dropped; don't dump it */ char *attidentity; + char *attgenerated; int *attlen; /* attribute length, used by binary_upgrade */ char *attalign; /* attribute align, used by binary_upgrade */ bool *attislocal; /* true if attr has local definition */ diff --git a/src/bin/pg_dump/t/002_pg_dump.pl b/src/bin/pg_dump/t/002_pg_dump.pl index c492fbdc24..d1dc01fcd6 100644 --- a/src/bin/pg_dump/t/002_pg_dump.pl +++ b/src/bin/pg_dump/t/002_pg_dump.pl @@ -4986,6 +4986,45 @@ role => 1, section_post_data => 1, }, }, + 'CREATE TABLE test_table_generated' => { + all_runs => 1, + catch_all => 'CREATE ... commands', + create_order => 3, + create_sql => 'CREATE TABLE dump_test.test_table_generated ( + col1 int primary key, + col2 int generated always as (col1 * 2) + );', + regexp => qr/^ + \QCREATE TABLE test_table_generated (\E\n + \s+\Qcol1 integer NOT NULL,\E\n + \s+\Qcol2 integer GENERATED ALWAYS AS (col1 * 2)\E\n + \); + /xms, + like => { + binary_upgrade => 1, + clean => 1, + clean_if_exists => 1, + createdb => 1, + defaults => 1, + exclude_test_table => 1, + exclude_test_table_data => 1, + no_blobs => 1, + no_privs => 1, + no_owner => 1, + only_dump_test_schema => 1, + pg_dumpall_dbprivs => 1, + schema_only => 1, + section_pre_data => 1, + test_schema_plus_blobs => 1, + with_oids => 1, }, + unlike => { + exclude_dump_test_schema => 1, + only_dump_test_table => 1, + pg_dumpall_globals => 1, + pg_dumpall_globals_clean => 1, + role => 1, + section_post_data => 1, }, }, + 'CREATE STATISTICS extended_stats_no_options' => { all_runs => 1, catch_all => 'CREATE ... commands', diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c index f6049cc9e5..f6242babc8 100644 --- a/src/bin/psql/describe.c +++ b/src/bin/psql/describe.c @@ -1594,7 +1594,7 @@ describeOneTableDetails(const char *schemaname, */ printfPQExpBuffer(&buf, "SELECT a.attname,"); appendPQExpBufferStr(&buf, "\n pg_catalog.format_type(a.atttypid, a.atttypmod)," - "\n (SELECT substring(pg_catalog.pg_get_expr(d.adbin, d.adrelid) for 128)" + "\n (SELECT substring(pg_catalog.pg_get_expr(d.adbin, d.adrelid, true) for 128)" "\n FROM pg_catalog.pg_attrdef d" "\n WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef)," "\n a.attnotnull, a.attnum,"); @@ -1607,6 +1607,10 @@ describeOneTableDetails(const char *schemaname, appendPQExpBufferStr(&buf, ",\n a.attidentity"); else appendPQExpBufferStr(&buf, ",\n ''::pg_catalog.char AS attidentity"); + if (pset.sversion >= 110000) + appendPQExpBufferStr(&buf, ",\n a.attgenerated"); + else + appendPQExpBufferStr(&buf, ",\n ''::pg_catalog.char AS attgenerated"); if (tableinfo.relkind == RELKIND_INDEX) appendPQExpBufferStr(&buf, ",\n pg_catalog.pg_get_indexdef(a.attrelid, a.attnum, TRUE) AS indexdef"); else @@ -1794,6 +1798,7 @@ describeOneTableDetails(const char *schemaname, if (show_column_details) { char *identity; + char *generated; char *default_str = ""; printTableAddCell(&cont, PQgetvalue(res, i, 5), false, false); @@ -1801,16 +1806,21 @@ describeOneTableDetails(const char *schemaname, printTableAddCell(&cont, strcmp(PQgetvalue(res, i, 3), "t") == 0 ? "not null" : "", false, false); identity = PQgetvalue(res, i, 6); + generated = PQgetvalue(res, i, 7); - if (!identity[0]) - /* (note: above we cut off the 'default' string at 128) */ - default_str = PQgetvalue(res, i, 2); - else if (identity[0] == ATTRIBUTE_IDENTITY_ALWAYS) + if (identity[0] == ATTRIBUTE_IDENTITY_ALWAYS) default_str = "generated always as identity"; else if (identity[0] == ATTRIBUTE_IDENTITY_BY_DEFAULT) default_str = "generated by default as identity"; + else if (generated[0] == ATTRIBUTE_GENERATED_STORED) + default_str = psprintf("generated always as (%s) stored", PQgetvalue(res, i, 2)); + else if (generated[0] == ATTRIBUTE_GENERATED_VIRTUAL) + default_str = psprintf("generated always as (%s)", PQgetvalue(res, i, 2)); + else + /* (note: above we cut off the 'default' string at 128) */ + default_str = PQgetvalue(res, i, 2); - printTableAddCell(&cont, default_str, false, false); + printTableAddCell(&cont, default_str, false, generated[0] ? true : false); } /* Value: for sequences only */ @@ -1819,16 +1829,16 @@ describeOneTableDetails(const char *schemaname, /* Expression for index column */ if (tableinfo.relkind == RELKIND_INDEX) - printTableAddCell(&cont, PQgetvalue(res, i, 7), false, false); + printTableAddCell(&cont, PQgetvalue(res, i, 8), false, false); /* FDW options for foreign table column, only for 9.2 or later */ if (tableinfo.relkind == RELKIND_FOREIGN_TABLE && pset.sversion >= 90200) - printTableAddCell(&cont, PQgetvalue(res, i, 8), false, false); + printTableAddCell(&cont, PQgetvalue(res, i, 9), false, false); /* Storage and Description */ if (verbose) { - int firstvcol = 9; + int firstvcol = 10; char *storage = PQgetvalue(res, i, firstvcol); /* these strings are literal in our syntax, so not translated. */ diff --git a/src/include/catalog/catversion.h b/src/include/catalog/catversion.h index 0dafd6bf2a..0ee2f33d40 100644 --- a/src/include/catalog/catversion.h +++ b/src/include/catalog/catversion.h @@ -53,6 +53,6 @@ */ /* yyyymmddN */ -#define CATALOG_VERSION_NO 201707211 +#define CATALOG_VERSION_NO 201708175 #endif diff --git a/src/include/catalog/heap.h b/src/include/catalog/heap.h index cb1bc887f8..1a762a6e63 100644 --- a/src/include/catalog/heap.h +++ b/src/include/catalog/heap.h @@ -103,13 +103,14 @@ extern List *AddRelationNewConstraints(Relation rel, bool is_internal); extern Oid StoreAttrDefault(Relation rel, AttrNumber attnum, - Node *expr, bool is_internal); + Node *expr, bool is_internal, bool generated_col); extern Node *cookDefault(ParseState *pstate, Node *raw_default, Oid atttypid, int32 atttypmod, - char *attname); + char *attname, + char attgenerated); extern void DeleteRelationTuple(Oid relid); extern void DeleteAttributeTuples(Oid relid); diff --git a/src/include/catalog/pg_attribute.h b/src/include/catalog/pg_attribute.h index bcf28e8f04..5d0ae8d9d4 100644 --- a/src/include/catalog/pg_attribute.h +++ b/src/include/catalog/pg_attribute.h @@ -136,6 +136,9 @@ CATALOG(pg_attribute,1249) BKI_BOOTSTRAP BKI_WITHOUT_OIDS BKI_ROWTYPE_OID(75) BK /* One of the ATTRIBUTE_IDENTITY_* constants below, or '\0' */ char attidentity; + /* One of the ATTRIBUTE_GENERATED_* constants below, or '\0' */ + char attgenerated; + /* Is dropped (ie, logically invisible) or not */ bool attisdropped; @@ -191,7 +194,7 @@ typedef FormData_pg_attribute *Form_pg_attribute; * ---------------- */ -#define Natts_pg_attribute 22 +#define Natts_pg_attribute 23 #define Anum_pg_attribute_attrelid 1 #define Anum_pg_attribute_attname 2 #define Anum_pg_attribute_atttypid 3 @@ -207,13 +210,14 @@ typedef FormData_pg_attribute *Form_pg_attribute; #define Anum_pg_attribute_attnotnull 13 #define Anum_pg_attribute_atthasdef 14 #define Anum_pg_attribute_attidentity 15 -#define Anum_pg_attribute_attisdropped 16 -#define Anum_pg_attribute_attislocal 17 -#define Anum_pg_attribute_attinhcount 18 -#define Anum_pg_attribute_attcollation 19 -#define Anum_pg_attribute_attacl 20 -#define Anum_pg_attribute_attoptions 21 -#define Anum_pg_attribute_attfdwoptions 22 +#define Anum_pg_attribute_attgenerated 16 +#define Anum_pg_attribute_attisdropped 17 +#define Anum_pg_attribute_attislocal 18 +#define Anum_pg_attribute_attinhcount 19 +#define Anum_pg_attribute_attcollation 20 +#define Anum_pg_attribute_attacl 21 +#define Anum_pg_attribute_attoptions 22 +#define Anum_pg_attribute_attfdwoptions 23 /* ---------------- @@ -228,4 +232,7 @@ typedef FormData_pg_attribute *Form_pg_attribute; #define ATTRIBUTE_IDENTITY_ALWAYS 'a' #define ATTRIBUTE_IDENTITY_BY_DEFAULT 'd' +#define ATTRIBUTE_GENERATED_STORED 's' +#define ATTRIBUTE_GENERATED_VIRTUAL 'v' + #endif /* PG_ATTRIBUTE_H */ diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h index b256657bda..40f5cc4f18 100644 --- a/src/include/catalog/pg_class.h +++ b/src/include/catalog/pg_class.h @@ -149,7 +149,7 @@ typedef FormData_pg_class *Form_pg_class; */ DATA(insert OID = 1247 ( pg_type PGNSP 71 0 PGUID 0 0 0 0 0 0 0 f f p r 30 0 t f f f f f f t n f 3 1 _null_ _null_ _null_)); DESCR(""); -DATA(insert OID = 1249 ( pg_attribute PGNSP 75 0 PGUID 0 0 0 0 0 0 0 f f p r 22 0 f f f f f f f t n f 3 1 _null_ _null_ _null_)); +DATA(insert OID = 1249 ( pg_attribute PGNSP 75 0 PGUID 0 0 0 0 0 0 0 f f p r 23 0 f f f f f f f t n f 3 1 _null_ _null_ _null_)); DESCR(""); DATA(insert OID = 1255 ( pg_proc PGNSP 81 0 PGUID 0 0 0 0 0 0 0 f f p r 29 0 t f f f f f f t n f 3 1 _null_ _null_ _null_)); DESCR(""); diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h index 5f2a4a75da..fce66ee0b3 100644 --- a/src/include/nodes/parsenodes.h +++ b/src/include/nodes/parsenodes.h @@ -647,6 +647,7 @@ typedef struct ColumnDef Node *raw_default; /* default value (untransformed parse tree) */ Node *cooked_default; /* default value (transformed expr tree) */ char identity; /* attidentity setting */ + char generated; /* attgenerated setting */ CollateClause *collClause; /* untransformed COLLATE spec, if any */ Oid collOid; /* collation OID (InvalidOid if not set) */ List *constraints; /* other constraints on column */ @@ -669,9 +670,10 @@ typedef enum TableLikeOption CREATE_TABLE_LIKE_DEFAULTS = 1 << 0, CREATE_TABLE_LIKE_CONSTRAINTS = 1 << 1, CREATE_TABLE_LIKE_IDENTITY = 1 << 2, - CREATE_TABLE_LIKE_INDEXES = 1 << 3, - CREATE_TABLE_LIKE_STORAGE = 1 << 4, - CREATE_TABLE_LIKE_COMMENTS = 1 << 5, + CREATE_TABLE_LIKE_GENERATED = 1 << 3, + CREATE_TABLE_LIKE_INDEXES = 1 << 4, + CREATE_TABLE_LIKE_STORAGE = 1 << 5, + CREATE_TABLE_LIKE_COMMENTS = 1 << 6, CREATE_TABLE_LIKE_ALL = PG_INT32_MAX } TableLikeOption; @@ -2044,6 +2046,7 @@ typedef enum ConstrType /* types of constraints */ CONSTR_NOTNULL, CONSTR_DEFAULT, CONSTR_IDENTITY, + CONSTR_GENERATED, CONSTR_CHECK, CONSTR_PRIMARY, CONSTR_UNIQUE, @@ -2082,7 +2085,8 @@ typedef struct Constraint bool is_no_inherit; /* is constraint non-inheritable? */ Node *raw_expr; /* expr, as untransformed parse tree */ char *cooked_expr; /* expr, as nodeToString representation */ - char generated_when; + char generated_when; /* ALWAYS or BY DEFAULT */ + char generated_kind; /* STORED or VIRTUAL */ /* Fields used for unique constraints (UNIQUE and PRIMARY KEY): */ List *keys; /* String nodes naming referenced column(s) */ diff --git a/src/include/parser/kwlist.h b/src/include/parser/kwlist.h index f50e45e886..7b28080186 100644 --- a/src/include/parser/kwlist.h +++ b/src/include/parser/kwlist.h @@ -377,6 +377,7 @@ PG_KEYWORD("statistics", STATISTICS, UNRESERVED_KEYWORD) PG_KEYWORD("stdin", STDIN, UNRESERVED_KEYWORD) PG_KEYWORD("stdout", STDOUT, UNRESERVED_KEYWORD) PG_KEYWORD("storage", STORAGE, UNRESERVED_KEYWORD) +PG_KEYWORD("stored", STORED, UNRESERVED_KEYWORD) PG_KEYWORD("strict", STRICT_P, UNRESERVED_KEYWORD) PG_KEYWORD("strip", STRIP_P, UNRESERVED_KEYWORD) PG_KEYWORD("subscription", SUBSCRIPTION, UNRESERVED_KEYWORD) @@ -432,6 +433,7 @@ PG_KEYWORD("verbose", VERBOSE, TYPE_FUNC_NAME_KEYWORD) PG_KEYWORD("version", VERSION_P, UNRESERVED_KEYWORD) PG_KEYWORD("view", VIEW, UNRESERVED_KEYWORD) PG_KEYWORD("views", VIEWS, UNRESERVED_KEYWORD) +PG_KEYWORD("virtual", VIRTUAL, UNRESERVED_KEYWORD) PG_KEYWORD("volatile", VOLATILE, UNRESERVED_KEYWORD) PG_KEYWORD("when", WHEN, RESERVED_KEYWORD) PG_KEYWORD("where", WHERE, RESERVED_KEYWORD) diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h index 68930c1f4a..470f163da6 100644 --- a/src/include/parser/parse_node.h +++ b/src/include/parser/parse_node.h @@ -67,7 +67,8 @@ typedef enum ParseExprKind EXPR_KIND_EXECUTE_PARAMETER, /* parameter value in EXECUTE */ EXPR_KIND_TRIGGER_WHEN, /* WHEN condition in CREATE TRIGGER */ EXPR_KIND_POLICY, /* USING or WITH CHECK expr in policy */ - EXPR_KIND_PARTITION_EXPRESSION /* PARTITION BY expression */ + EXPR_KIND_PARTITION_EXPRESSION, /* PARTITION BY expression */ + EXPR_KIND_GENERATED_COLUMN /* generation expression for a column */ } ParseExprKind; diff --git a/src/include/rewrite/rewriteHandler.h b/src/include/rewrite/rewriteHandler.h index 494fa29f10..3b7bb45068 100644 --- a/src/include/rewrite/rewriteHandler.h +++ b/src/include/rewrite/rewriteHandler.h @@ -22,12 +22,13 @@ extern void AcquireRewriteLocks(Query *parsetree, bool forExecute, bool forUpdatePushedDown); -extern Node *build_column_default(Relation rel, int attrno); +extern Node *build_column_default(Relation rel, int attrno, bool allow_typdefault); extern Query *get_view_query(Relation view); extern const char *view_query_is_auto_updatable(Query *viewquery, bool check_cols); extern int relation_is_updatable(Oid reloid, bool include_triggers, Bitmapset *include_cols); +extern Expr *expand_generated_columns_in_expr(Expr *expr, Relation rel); #endif /* REWRITEHANDLER_H */ diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h index 07208b56ce..a7e921ebad 100644 --- a/src/include/utils/lsyscache.h +++ b/src/include/utils/lsyscache.h @@ -86,6 +86,7 @@ extern Oid get_opfamily_proc(Oid opfamily, Oid lefttype, Oid righttype, extern char *get_attname(Oid relid, AttrNumber attnum); extern char *get_relid_attribute_name(Oid relid, AttrNumber attnum); extern AttrNumber get_attnum(Oid relid, const char *attname); +extern char get_attgenerated(Oid relid, AttrNumber attnum); extern char get_attidentity(Oid relid, AttrNumber attnum); extern Oid get_atttype(Oid relid, AttrNumber attnum); extern int32 get_atttypmod(Oid relid, AttrNumber attnum); diff --git a/src/test/regress/expected/create_table_like.out b/src/test/regress/expected/create_table_like.out index 3f405c94ce..5d47e22981 100644 --- a/src/test/regress/expected/create_table_like.out +++ b/src/test/regress/expected/create_table_like.out @@ -113,6 +113,52 @@ SELECT * FROM test_like_id_3; -- identity was copied and applied (1 row) DROP TABLE test_like_id_1, test_like_id_2, test_like_id_3; +CREATE TABLE test_like_gen_1 (a int, b int GENERATED ALWAYS AS (a * 2)); +\d test_like_gen_1 + Table "public.test_like_gen_1" + Column | Type | Collation | Nullable | Default +--------+---------+-----------+----------+----------------------------- + a | integer | | | + b | integer | | | generated always as (a * 2) + +INSERT INTO test_like_gen_1 (a) VALUES (1); +SELECT * FROM test_like_gen_1; + a | b +---+--- + 1 | 2 +(1 row) + +CREATE TABLE test_like_gen_2 (LIKE test_like_gen_1); +\d test_like_gen_2 + Table "public.test_like_gen_2" + Column | Type | Collation | Nullable | Default +--------+---------+-----------+----------+--------- + a | integer | | | + b | integer | | | + +INSERT INTO test_like_gen_2 (a) VALUES (1); +SELECT * FROM test_like_gen_2; + a | b +---+--- + 1 | +(1 row) + +CREATE TABLE test_like_gen_3 (LIKE test_like_gen_1 INCLUDING GENERATED); +\d test_like_gen_3 + Table "public.test_like_gen_3" + Column | Type | Collation | Nullable | Default +--------+---------+-----------+----------+----------------------------- + a | integer | | | + b | integer | | | generated always as (a * 2) + +INSERT INTO test_like_gen_3 (a) VALUES (1); +SELECT * FROM test_like_gen_3; + a | b +---+--- + 1 | 2 +(1 row) + +DROP TABLE test_like_gen_1, test_like_gen_2, test_like_gen_3; CREATE TABLE inhg (x text, LIKE inhx INCLUDING INDEXES, y text); /* copies indexes */ INSERT INTO inhg VALUES (5, 10); INSERT INTO inhg VALUES (20, 10); -- should fail diff --git a/src/test/regress/expected/generated.out b/src/test/regress/expected/generated.out new file mode 100644 index 0000000000..78536203e9 --- /dev/null +++ b/src/test/regress/expected/generated.out @@ -0,0 +1,309 @@ +CREATE TABLE gtest0 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (55)); +CREATE TABLE gtest1 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2)); +SELECT table_name, column_name, column_default, is_nullable, is_generated, generation_expression FROM information_schema.columns WHERE table_name LIKE 'gtest_' ORDER BY 1, 2; + table_name | column_name | column_default | is_nullable | is_generated | generation_expression +------------+-------------+----------------+-------------+--------------+----------------------- + gtest0 | a | | NO | NEVER | + gtest0 | b | | YES | ALWAYS | 55 + gtest1 | a | | NO | NEVER | + gtest1 | b | | YES | ALWAYS | a * 2 +(4 rows) + +-- duplicate generated +CREATE TABLE gtest_err_1 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) GENERATED ALWAYS AS (a * 3)); +ERROR: multiple generation clauses specified for column "b" of table "gtest_err_1" +LINE 1: ...nt PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) GENERATED ... + ^ +-- references to other generated columns, including self-references +CREATE TABLE gtest_err_2a (a int PRIMARY KEY, b int GENERATED ALWAYS AS (b * 2)); +ERROR: cannot use generated column "b" in column generation expression +DETAIL: A generated column cannot reference another generated column. +CREATE TABLE gtest_err_2b (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2), c int GENERATED ALWAYS AS (b * 3)); +ERROR: cannot use generated column "b" in column generation expression +DETAIL: A generated column cannot reference another generated column. +-- invalid reference +CREATE TABLE gtest_err_3 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (c * 2)); +ERROR: column "c" does not exist +-- functions must be immutable +CREATE TABLE gtest_err_4 (a int PRIMARY KEY, b double precision GENERATED ALWAYS AS (random())); +ERROR: cannot use function random() in column generation expression +DETAIL: Functions used in a column generation expression must be immutable. +-- cannot have default/identity and generated +CREATE TABLE gtest_err_5a (a int PRIMARY KEY, b int DEFAULT 5 GENERATED ALWAYS AS (a * 2)); +ERROR: both default and generation expression specified for column "b" of table "gtest_err_5a" +LINE 1: ... gtest_err_5a (a int PRIMARY KEY, b int DEFAULT 5 GENERATED ... + ^ +CREATE TABLE gtest_err_5b (a int PRIMARY KEY, b int GENERATED ALWAYS AS identity GENERATED ALWAYS AS (a * 2)); +ERROR: both identity and generation expression specified for column "b" of table "gtest_err_5b" +LINE 1: ...t PRIMARY KEY, b int GENERATED ALWAYS AS identity GENERATED ... + ^ +INSERT INTO gtest1 VALUES (1); +INSERT INTO gtest1 VALUES (2, DEFAULT); +INSERT INTO gtest1 VALUES (3, 33); -- error +ERROR: cannot insert into column "b" +DETAIL: Column "b" is a generated column. +SELECT * FROM gtest1 ORDER BY a; + a | b +---+--- + 1 | 2 + 2 | 4 +(2 rows) + +UPDATE gtest1 SET b = DEFAULT WHERE a = 1; +UPDATE gtest1 SET b = 11 WHERE a = 1; -- error +ERROR: column "b" can only be updated to DEFAULT +DETAIL: Column "b" is a generated column. +SELECT * FROM gtest1 ORDER BY a; + a | b +---+--- + 1 | 2 + 2 | 4 +(2 rows) + +SELECT a, b, b * 2 AS b2 FROM gtest1 ORDER BY a; + a | b | b2 +---+---+---- + 1 | 2 | 4 + 2 | 4 | 8 +(2 rows) + +SELECT a, b FROM gtest1 WHERE b = 4 ORDER BY a; + a | b +---+--- + 2 | 4 +(1 row) + +-- test with joins +CREATE TABLE gtestx (x int, y int); +INSERT INTO gtestx VALUES (11, 1), (22, 2), (33, 3); +SELECT * FROM gtestx, gtest1 WHERE gtestx.y = gtest1.a; + x | y | a | b +----+---+---+--- + 11 | 1 | 1 | 2 + 22 | 2 | 2 | 4 +(2 rows) + +DROP TABLE gtestx; +-- test UPDATE/DELETE quals +SELECT * FROM gtest1 ORDER BY a; + a | b +---+--- + 1 | 2 + 2 | 4 +(2 rows) + +UPDATE gtest1 SET a = 3 WHERE b = 4; +SELECT * FROM gtest1 ORDER BY a; + a | b +---+--- + 1 | 2 + 3 | 6 +(2 rows) + +DELETE FROM gtest1 WHERE b = 2; +SELECT * FROM gtest1 ORDER BY a; + a | b +---+--- + 3 | 6 +(1 row) + +-- stored +CREATE TABLE gtest3 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 3) STORED); +INSERT INTO gtest3 (a) VALUES (1), (2), (3); +ERROR: stored generated columns are not yet implemented +SELECT * FROM gtest3 ORDER BY a; + a | b +---+--- +(0 rows) + +UPDATE gtest3 SET a = 22 WHERE a = 2; +ERROR: stored generated columns are not yet implemented +SELECT * FROM gtest3 ORDER BY a; + a | b +---+--- +(0 rows) + +-- COPY +TRUNCATE gtest1; +INSERT INTO gtest1 (a) VALUES (1), (2); +COPY gtest1 TO stdout; +1 +2 +COPY gtest1 (a, b) TO stdout; +ERROR: column "b" is a generated column +DETAIL: Generated columns cannot be used in COPY. +COPY gtest1 FROM stdin; +COPY gtest1 (a, b) FROM stdin; +ERROR: column "b" is a generated column +DETAIL: Generated columns cannot be used in COPY. +SELECT * FROM gtest1 ORDER BY a; + a | b +---+--- + 1 | 2 + 2 | 4 + 3 | 6 +(3 rows) + +-- drop column behavior +CREATE TABLE gtest10 (a int PRIMARY KEY, b int, c int GENERATED ALWAYS AS (b * 2)); +ALTER TABLE gtest10 DROP COLUMN b; +\d gtest10 + Table "public.gtest10" + Column | Type | Collation | Nullable | Default +--------+---------+-----------+----------+--------- + a | integer | | not null | +Indexes: + "gtest10_pkey" PRIMARY KEY, btree (a) + +-- privileges +CREATE USER regress_user11; +CREATE TABLE gtest11 (a int PRIMARY KEY, b int, c int GENERATED ALWAYS AS (b * 2)); +INSERT INTO gtest11 VALUES (1, 10), (2, 20); +GRANT SELECT (a, c) ON gtest11 TO regress_user11; +CREATE FUNCTION gf1(a int) RETURNS int AS $$ SELECT a * 3 $$ IMMUTABLE LANGUAGE SQL; +REVOKE ALL ON FUNCTION gf1(int) FROM PUBLIC; +CREATE TABLE gtest12 (a int PRIMARY KEY, b int, c int GENERATED ALWAYS AS (gf1(b))); +INSERT INTO gtest12 VALUES (1, 10), (2, 20); +GRANT SELECT (a, c) ON gtest12 TO regress_user11; +SET ROLE regress_user11; +SELECT a, b FROM gtest11; -- not allowed +ERROR: permission denied for relation gtest11 +SELECT a, c FROM gtest11; -- allowed + a | c +---+---- + 1 | 20 + 2 | 40 +(2 rows) + +SELECT gf1(10); -- not allowed +ERROR: permission denied for function gf1 +SELECT a, c FROM gtest12; -- FIXME: should be allowed +ERROR: permission denied for function gf1 +RESET ROLE; +DROP TABLE gtest11, gtest12; +DROP FUNCTION gf1(int); +DROP USER regress_user11; +-- check constraints +CREATE TABLE gtest20 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) CHECK (b < 50)); +INSERT INTO gtest20 (a) VALUES (10); -- ok +INSERT INTO gtest20 (a) VALUES (30); -- violates constraint +ERROR: new row for relation "gtest20" violates check constraint "gtest20_b_check" +DETAIL: Failing row contains (30). +-- not-null constraints +CREATE TABLE gtest21 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (nullif(a, 0)) not null); +INSERT INTO gtest21 (a) VALUES (1); -- ok +INSERT INTO gtest21 (a) VALUES (0); -- violates constraint +ERROR: new row for relation "gtest21" violates check constraint "gtest21_b_check" +DETAIL: Failing row contains (0). +-- index constraints +CREATE TABLE gtest22a (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) unique); +ERROR: index creation on generated columns is not supported +CREATE TABLE gtest22b (a int, b int GENERATED ALWAYS AS (a * 2), PRIMARY KEY (a, b)); +ERROR: index creation on generated columns is not supported +CREATE TABLE gtest22c (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2)); +CREATE INDEX ON gtest22c (b); +ERROR: index creation on generated columns is not supported +CREATE INDEX ON gtest22c ((b * 2)); +ERROR: index creation on generated columns is not supported +CREATE INDEX ON gtest22c (a) WHERE b > 0; +ERROR: index creation on generated columns is not supported +-- foreign keys +CREATE TABLE gtest23a (x int PRIMARY KEY, y int); +CREATE TABLE gtest23b (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) REFERENCES gtest23a (x) ON UPDATE CASCADE); +ERROR: invalid ON UPDATE action for foreign key constraint containing generated column +CREATE TABLE gtest23b (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) REFERENCES gtest23a (x) ON DELETE SET NULL); +ERROR: invalid ON DELETE action for foreign key constraint containing generated column +CREATE TABLE gtest23b (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) REFERENCES gtest23a (x)); +ERROR: foreign key constraints on generated columns are not supported +DROP TABLE gtest23a; +-- domains +CREATE DOMAIN gtestdomain1 AS int CHECK (VALUE < 10); +CREATE TABLE gtest24 (a int PRIMARY KEY, b gtestdomain1 GENERATED ALWAYS AS (a * 2)); -- prohibited +ERROR: virtual generated column "b" cannot have a domain type +LINE 1: CREATE TABLE gtest24 (a int PRIMARY KEY, b gtestdomain1 GENE... + ^ +-- ALTER TABLE +CREATE TABLE gtest25 (a int PRIMARY KEY); +INSERT INTO gtest25 VALUES (3), (4); +ALTER TABLE gtest25 ADD COLUMN b int GENERATED ALWAYS AS (a * 3); +SELECT * FROM gtest25 ORDER BY a; + a | b +---+---- + 3 | 9 + 4 | 12 +(2 rows) + +ALTER TABLE gtest25 ADD COLUMN x int GENERATED ALWAYS AS (b * 4); -- error +ERROR: cannot use generated column "b" in column generation expression +DETAIL: A generated column cannot reference another generated column. +ALTER TABLE gtest25 ADD COLUMN x int GENERATED ALWAYS AS (z * 4); -- error +ERROR: column "z" does not exist +-- triggers +CREATE TABLE gtest26 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2)); +CREATE FUNCTION gtest_trigger_func() RETURNS trigger + LANGUAGE plpgsql +AS $$ +BEGIN + RAISE INFO '%: old = %', TG_NAME, OLD; + RAISE INFO '%: new = %', TG_NAME, NEW; + RETURN NEW; +END +$$; +CREATE TRIGGER gtest1 BEFORE UPDATE ON gtest26 + FOR EACH ROW + WHEN (OLD.b < 0) -- ok + EXECUTE PROCEDURE gtest_trigger_func(); +CREATE TRIGGER gtest2 BEFORE UPDATE ON gtest26 + FOR EACH ROW + WHEN (NEW.b < 0) -- error + EXECUTE PROCEDURE gtest_trigger_func(); +ERROR: BEFORE trigger's WHEN condition cannot reference NEW generated columns +LINE 3: WHEN (NEW.b < 0) + ^ +CREATE TRIGGER gtest3 AFTER UPDATE ON gtest26 + FOR EACH ROW + WHEN (OLD.b < 0) -- ok + EXECUTE PROCEDURE gtest_trigger_func(); +CREATE TRIGGER gtest4 AFTER UPDATE ON gtest26 + FOR EACH ROW + WHEN (NEW.b < 0) -- ok + EXECUTE PROCEDURE gtest_trigger_func(); +INSERT INTO gtest26 (a) VALUES (-2), (0), (3); +SELECT * FROM gtest26 ORDER BY a; + a | b +----+---- + -2 | -4 + 0 | 0 + 3 | 6 +(3 rows) + +UPDATE gtest26 SET a = a * -2; +INFO: gtest1: old = (-2,) +INFO: gtest1: new = (4,) +INFO: gtest3: old = (-2,) +INFO: gtest3: new = (4,) +INFO: gtest4: old = (3,) +INFO: gtest4: new = (-6,) +SELECT * FROM gtest26 ORDER BY a; + a | b +----+----- + -6 | -12 + 0 | 0 + 4 | 8 +(3 rows) + +CREATE FUNCTION gtest_trigger_func2() RETURNS trigger + LANGUAGE plpgsql +AS $$ +BEGIN + NEW.b = 5; + RETURN NEW; +END +$$; +CREATE TRIGGER gtest10 BEFORE INSERT OR UPDATE ON gtest26 + FOR EACH ROW + EXECUTE PROCEDURE gtest_trigger_func2(); +INSERT INTO gtest26 (a) VALUES (10); +ERROR: trigger modified virtual generated column value +UPDATE gtest26 SET a = 1 WHERE a = 0; +ERROR: trigger modified virtual generated column value diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule index eefdeeacae..e8f2fbe659 100644 --- a/src/test/regress/parallel_schedule +++ b/src/test/regress/parallel_schedule @@ -114,7 +114,7 @@ test: plancache limit plpgsql copy2 temp domain rangefuncs prepare without_oid c # ---------- # Another group of parallel tests # ---------- -test: identity +test: identity generated # event triggers cannot run concurrently with any test that runs DDL test: event_trigger diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule index 76b0de30a7..3493c63824 100644 --- a/src/test/regress/serial_schedule +++ b/src/test/regress/serial_schedule @@ -171,6 +171,7 @@ test: truncate test: alter_table test: sequence test: identity +test: generated test: polymorphism test: rowtypes test: returning diff --git a/src/test/regress/sql/create_table_like.sql b/src/test/regress/sql/create_table_like.sql index 557040bbe7..2ae96e3d68 100644 --- a/src/test/regress/sql/create_table_like.sql +++ b/src/test/regress/sql/create_table_like.sql @@ -51,6 +51,20 @@ CREATE TABLE test_like_id_3 (LIKE test_like_id_1 INCLUDING IDENTITY); SELECT * FROM test_like_id_3; -- identity was copied and applied DROP TABLE test_like_id_1, test_like_id_2, test_like_id_3; +CREATE TABLE test_like_gen_1 (a int, b int GENERATED ALWAYS AS (a * 2)); +\d test_like_gen_1 +INSERT INTO test_like_gen_1 (a) VALUES (1); +SELECT * FROM test_like_gen_1; +CREATE TABLE test_like_gen_2 (LIKE test_like_gen_1); +\d test_like_gen_2 +INSERT INTO test_like_gen_2 (a) VALUES (1); +SELECT * FROM test_like_gen_2; +CREATE TABLE test_like_gen_3 (LIKE test_like_gen_1 INCLUDING GENERATED); +\d test_like_gen_3 +INSERT INTO test_like_gen_3 (a) VALUES (1); +SELECT * FROM test_like_gen_3; +DROP TABLE test_like_gen_1, test_like_gen_2, test_like_gen_3; + CREATE TABLE inhg (x text, LIKE inhx INCLUDING INDEXES, y text); /* copies indexes */ INSERT INTO inhg VALUES (5, 10); INSERT INTO inhg VALUES (20, 10); -- should fail diff --git a/src/test/regress/sql/generated.sql b/src/test/regress/sql/generated.sql new file mode 100644 index 0000000000..9dc96ad93d --- /dev/null +++ b/src/test/regress/sql/generated.sql @@ -0,0 +1,192 @@ +CREATE TABLE gtest0 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (55)); +CREATE TABLE gtest1 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2)); + +SELECT table_name, column_name, column_default, is_nullable, is_generated, generation_expression FROM information_schema.columns WHERE table_name LIKE 'gtest_' ORDER BY 1, 2; + +-- duplicate generated +CREATE TABLE gtest_err_1 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) GENERATED ALWAYS AS (a * 3)); + +-- references to other generated columns, including self-references +CREATE TABLE gtest_err_2a (a int PRIMARY KEY, b int GENERATED ALWAYS AS (b * 2)); +CREATE TABLE gtest_err_2b (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2), c int GENERATED ALWAYS AS (b * 3)); + +-- invalid reference +CREATE TABLE gtest_err_3 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (c * 2)); + +-- functions must be immutable +CREATE TABLE gtest_err_4 (a int PRIMARY KEY, b double precision GENERATED ALWAYS AS (random())); + +-- cannot have default/identity and generated +CREATE TABLE gtest_err_5a (a int PRIMARY KEY, b int DEFAULT 5 GENERATED ALWAYS AS (a * 2)); +CREATE TABLE gtest_err_5b (a int PRIMARY KEY, b int GENERATED ALWAYS AS identity GENERATED ALWAYS AS (a * 2)); + +INSERT INTO gtest1 VALUES (1); +INSERT INTO gtest1 VALUES (2, DEFAULT); +INSERT INTO gtest1 VALUES (3, 33); -- error + +SELECT * FROM gtest1 ORDER BY a; + +UPDATE gtest1 SET b = DEFAULT WHERE a = 1; +UPDATE gtest1 SET b = 11 WHERE a = 1; -- error + +SELECT * FROM gtest1 ORDER BY a; + +SELECT a, b, b * 2 AS b2 FROM gtest1 ORDER BY a; +SELECT a, b FROM gtest1 WHERE b = 4 ORDER BY a; + +-- test with joins +CREATE TABLE gtestx (x int, y int); +INSERT INTO gtestx VALUES (11, 1), (22, 2), (33, 3); +SELECT * FROM gtestx, gtest1 WHERE gtestx.y = gtest1.a; +DROP TABLE gtestx; + +-- test UPDATE/DELETE quals +SELECT * FROM gtest1 ORDER BY a; +UPDATE gtest1 SET a = 3 WHERE b = 4; +SELECT * FROM gtest1 ORDER BY a; +DELETE FROM gtest1 WHERE b = 2; +SELECT * FROM gtest1 ORDER BY a; + +-- stored +CREATE TABLE gtest3 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 3) STORED); +INSERT INTO gtest3 (a) VALUES (1), (2), (3); +SELECT * FROM gtest3 ORDER BY a; +UPDATE gtest3 SET a = 22 WHERE a = 2; +SELECT * FROM gtest3 ORDER BY a; + +-- COPY +TRUNCATE gtest1; +INSERT INTO gtest1 (a) VALUES (1), (2); + +COPY gtest1 TO stdout; + +COPY gtest1 (a, b) TO stdout; + +COPY gtest1 FROM stdin; +3 +\. + +COPY gtest1 (a, b) FROM stdin; + +SELECT * FROM gtest1 ORDER BY a; + +-- drop column behavior +CREATE TABLE gtest10 (a int PRIMARY KEY, b int, c int GENERATED ALWAYS AS (b * 2)); +ALTER TABLE gtest10 DROP COLUMN b; + +\d gtest10 + +-- privileges +CREATE USER regress_user11; +CREATE TABLE gtest11 (a int PRIMARY KEY, b int, c int GENERATED ALWAYS AS (b * 2)); +INSERT INTO gtest11 VALUES (1, 10), (2, 20); +GRANT SELECT (a, c) ON gtest11 TO regress_user11; + +CREATE FUNCTION gf1(a int) RETURNS int AS $$ SELECT a * 3 $$ IMMUTABLE LANGUAGE SQL; +REVOKE ALL ON FUNCTION gf1(int) FROM PUBLIC; +CREATE TABLE gtest12 (a int PRIMARY KEY, b int, c int GENERATED ALWAYS AS (gf1(b))); +INSERT INTO gtest12 VALUES (1, 10), (2, 20); +GRANT SELECT (a, c) ON gtest12 TO regress_user11; + +SET ROLE regress_user11; +SELECT a, b FROM gtest11; -- not allowed +SELECT a, c FROM gtest11; -- allowed +SELECT gf1(10); -- not allowed +SELECT a, c FROM gtest12; -- FIXME: should be allowed +RESET ROLE; + +DROP TABLE gtest11, gtest12; +DROP FUNCTION gf1(int); +DROP USER regress_user11; + +-- check constraints +CREATE TABLE gtest20 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) CHECK (b < 50)); +INSERT INTO gtest20 (a) VALUES (10); -- ok +INSERT INTO gtest20 (a) VALUES (30); -- violates constraint + +-- not-null constraints +CREATE TABLE gtest21 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (nullif(a, 0)) not null); +INSERT INTO gtest21 (a) VALUES (1); -- ok +INSERT INTO gtest21 (a) VALUES (0); -- violates constraint + +-- index constraints +CREATE TABLE gtest22a (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) unique); +CREATE TABLE gtest22b (a int, b int GENERATED ALWAYS AS (a * 2), PRIMARY KEY (a, b)); +CREATE TABLE gtest22c (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2)); +CREATE INDEX ON gtest22c (b); +CREATE INDEX ON gtest22c ((b * 2)); +CREATE INDEX ON gtest22c (a) WHERE b > 0; + +-- foreign keys +CREATE TABLE gtest23a (x int PRIMARY KEY, y int); +CREATE TABLE gtest23b (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) REFERENCES gtest23a (x) ON UPDATE CASCADE); +CREATE TABLE gtest23b (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) REFERENCES gtest23a (x) ON DELETE SET NULL); +CREATE TABLE gtest23b (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2) REFERENCES gtest23a (x)); +DROP TABLE gtest23a; + +-- domains +CREATE DOMAIN gtestdomain1 AS int CHECK (VALUE < 10); +CREATE TABLE gtest24 (a int PRIMARY KEY, b gtestdomain1 GENERATED ALWAYS AS (a * 2)); -- prohibited + +-- ALTER TABLE +CREATE TABLE gtest25 (a int PRIMARY KEY); +INSERT INTO gtest25 VALUES (3), (4); +ALTER TABLE gtest25 ADD COLUMN b int GENERATED ALWAYS AS (a * 3); +SELECT * FROM gtest25 ORDER BY a; +ALTER TABLE gtest25 ADD COLUMN x int GENERATED ALWAYS AS (b * 4); -- error +ALTER TABLE gtest25 ADD COLUMN x int GENERATED ALWAYS AS (z * 4); -- error + +-- triggers +CREATE TABLE gtest26 (a int PRIMARY KEY, b int GENERATED ALWAYS AS (a * 2)); + +CREATE FUNCTION gtest_trigger_func() RETURNS trigger + LANGUAGE plpgsql +AS $$ +BEGIN + RAISE INFO '%: old = %', TG_NAME, OLD; + RAISE INFO '%: new = %', TG_NAME, NEW; + RETURN NEW; +END +$$; + +CREATE TRIGGER gtest1 BEFORE UPDATE ON gtest26 + FOR EACH ROW + WHEN (OLD.b < 0) -- ok + EXECUTE PROCEDURE gtest_trigger_func(); + +CREATE TRIGGER gtest2 BEFORE UPDATE ON gtest26 + FOR EACH ROW + WHEN (NEW.b < 0) -- error + EXECUTE PROCEDURE gtest_trigger_func(); + +CREATE TRIGGER gtest3 AFTER UPDATE ON gtest26 + FOR EACH ROW + WHEN (OLD.b < 0) -- ok + EXECUTE PROCEDURE gtest_trigger_func(); + +CREATE TRIGGER gtest4 AFTER UPDATE ON gtest26 + FOR EACH ROW + WHEN (NEW.b < 0) -- ok + EXECUTE PROCEDURE gtest_trigger_func(); + +INSERT INTO gtest26 (a) VALUES (-2), (0), (3); +SELECT * FROM gtest26 ORDER BY a; +UPDATE gtest26 SET a = a * -2; +SELECT * FROM gtest26 ORDER BY a; + + +CREATE FUNCTION gtest_trigger_func2() RETURNS trigger + LANGUAGE plpgsql +AS $$ +BEGIN + NEW.b = 5; + RETURN NEW; +END +$$; + +CREATE TRIGGER gtest10 BEFORE INSERT OR UPDATE ON gtest26 + FOR EACH ROW + EXECUTE PROCEDURE gtest_trigger_func2(); + +INSERT INTO gtest26 (a) VALUES (10); +UPDATE gtest26 SET a = 1 WHERE a = 0; base-commit: 04e9678614ec64ad9043174ac99a25b1dc45233a -- 2.14.1