diff --git a/doc/src/sgml/array.sgml b/doc/src/sgml/array.sgml
index bb4657e..487a219 100644
*** a/doc/src/sgml/array.sgml
--- b/doc/src/sgml/array.sgml
*************** INSERT ... VALUES (E'{"\\\\","\\""}');
*** 706,709 ****
--- 706,819 ----
+
+ Multiset Support
+
+
+ array
+ multiset
+
+
+
+ Multiset is another collection data type specified in the SQL standard.
+ It is similar to arrays, but the order of elements is irrelevant.
+ PostgreSQL doesn't support distinct multiset
+ data type, but has serveral functions and operators based on array types.
+
+
+
+ MEMBER OF and SUBMULTISET OF operators returns
+ true when the element or subset is contained by the collection.
+ <& operator is an alias SUBMULTISET OF operator,
+ and &> operator is the commutator of them.
+ MEMBER OF is exactly same as = ANY operator.
+ On the other hand, SUBMULTISET OF differs from <@
+ (contained operator) because it returns true only if the container have equal
+ or more elements the containded collection.
+
+ SELECT 2 MEMBER OF ARRAY[1,2], 2 = ANY(ARRAY[1,2]);
+ ?column? | ?column?
+ ----------+----------
+ t | t
+ (1 row)
+
+ SELECT ARRAY[1,1] SUBMULTISET OF ARRAY[1,2],
+ ARRAY[1,1] <@ ARRAY[1,2];
+ ?column? | ?column?
+ ----------+----------
+ f | t
+ (1 row)
+
+
+
+
+ IS A SET operator returns true when the collection has
+ no duplicated values. A collection that has two or more NULLs are not
+ considered as a set.
+
+ SELECT ARRAY[1,2,3] IS A SET,
+ ARRAY[1,1,2] IS A SET,
+ ARRAY[1,NULL,NULL] IS A SET;
+
+ is_a_set | is_a_set | is_a_set
+ ----------+----------+----------
+ t | f | f
+ (1 row)
+
+ set function returns a collection of unique elements
+ as like as DISTINCT clause in a query.
+
+ SELECT set(ARRAY[1,2,NULL,2,NULL,1,2]);
+ set
+ ------------
+ {1,2,NULL}
+ (1 row)
+
+
+
+
+ MULTISET EXCEPT, MULTISET INTERSECT, and
+ MULTISET UNION operator combine two collections as like as
+ set operations in a query (see ).
+ They can have optional ALL or DISTINCT options.
+ If DISTINCT is specified or not specified, they eliminates
+ duplicated elements before the set operations.
+
+ SELECT ARRAY[2,NULL,1,2,NULL] MULTISET UNION ARRAY[2,NULL],
+ ARRAY[2,NULL,1,2,NULL] MULTISET INTERSECT ARRAY[2,NULL],
+ ARRAY[2,NULL,1,2,NULL] MULTISET EXCEPT ARRAY[2,NULL];
+ multiset_union | multiset_intersect | multiset_except
+ ----------------+--------------------+-----------------
+ {1,2,NULL} | {2,NULL} | {1}
+ (1 row)
+
+ SELECT ARRAY[2,NULL,1,2,NULL] MULTISET UNION ALL ARRAY[2,NULL],
+ ARRAY[2,NULL,1,2,NULL] MULTISET INTERSECT ALL ARRAY[2,NULL],
+ ARRAY[2,NULL,1,2,NULL] MULTISET EXCEPT ALL ARRAY[2,NULL];
+ multiset_union | multiset_intersect | multiset_except
+ --------------------------+--------------------+-----------------
+ {2,NULL,1,2,NULL,2,NULL} | {2,NULL} | {1,2,NULL}
+ (1 row)
+
+
+
+
+
+ Since multisets are actually arrays, some of operators and functions still
+ treats them as arrays. The following example shows two collections are
+ sub-multiset of each other, but not equal with = operator
+ because they are arrays in fact; they have the same set of elements, but
+ differ in the order of elements.
+
+ SELECT a SUBMULTISET OF b, b SUBMULTISET OF a, a = b
+ FROM (VALUES(ARRAY[1,2], ARRAY[2,1])) t(a, b);
+ ?column? | ?column? | ?column?
+ ----------+----------+----------
+ t | t | f
+ (1 row)
+
+
+
+
+
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 04769f1..31166ae 100644
*** a/doc/src/sgml/func.sgml
--- b/doc/src/sgml/func.sgml
*************** SELECT NULLIF(value, '(none)') ...
*** 10196,10201 ****
--- 10196,10325 ----
+ shows the multiset operators
+ available for array types. See for more details
+ and limitations.
+
+
+
+ Multiset Operators
+
+
+
+ Operator
+ Description
+ Example
+ Result
+
+
+
+
+
+
+ IS A SET
+
+ IS [ NOT ] A SET
+
+ has only unique elements
+ ARRAY[1,2,3] IS A SET
+ t
+
+
+
+
+
+ MEMBER OF
+
+ [ NOT ] MEMBER OF
+
+ is a member of
+ 2 MEMBER OF ARRAY[1,2,3]
+ t
+
+
+
+
+
+ SUBMULTISET OF
+
+ [ NOT ] SUBMULTISET OF
+
+ is a subset of
+ ARRAY[1,2] SUBMULTISET OF ARRAY[3,2,1]
+ t
+
+
+
+ &>
+ is a superset of
+ ARRAY[1,3,2,1] &> ARRAY[1,1,2]
+ t
+
+
+
+ <&
+ is a subset of
+ ARRAY[1,1,2] <& ARRAY[1,3,2,1]
+ t
+
+
+
+
+
+ MULTISET EXCEPT
+
+ MULTISET EXCEPT [ ALL | DISTINCT ]
+
+ subtraction of
+ ARRAY[1,1,2] MULTISET EXCEPT ARRAY[1,3]
+ {2}
+
+
+
+
+
+ MULTISET INTERSECT
+
+ MULTISET INTERSECT [ ALL | DISTINCT ]
+
+ intersection of
+ ARRAY[1,1,2] MULTISET INTERSECT ARRAY[1,3]
+ {1}
+
+
+
+
+
+ MULTISET UNION
+
+ MULTISET UNION [ ALL | DISTINCT ]
+
+ union of
+ ARRAY[1,1,2] MULTISET UNION ARRAY[1,3]
+ {1,2,3}
+
+
+
+
+
+
+ In IS A SET, MEMBER OF, SUBMULTISET OF,
+ MULTISET INTERSECT, MULTISET UNION, and
+ MULTISET EXCEPT operators, the order of elements in input array
+ are ignored. They treats the input as a multiset (or bag) rather than an array.
+ Dimension and lower bound of the array don't affect the result at all.
+
+
+
+ SUBMULTISET OF treats NULLs in input arrays as unknown values.
+ For example, ARRAY[1, 2] SUBMULTISET OF ARRAY[1, NULL] returns
+ NULL. It means we cannot determine whether they matches or not because the
+ NULL in the right hand argument might be 2 or other value. On the other hand,
+ ARRAY[1, 2] SUBMULTISET OF ARRAY[3, NULL] returns false because
+ there are NULL values less than unmatched values.
+
+
+
shows the functions
available for use with array types. See
for more information and examples of the use of these functions.
*************** SELECT NULLIF(value, '(none)') ...
*** 10226,10240 ****
--- 10350,10376 ----
array_prepend
+ array_sort
+
+
array_to_string
array_upper
+ cardinality
+
+
string_to_array
+ set
+
+
+ trim_array
+
+
unnest
*************** SELECT NULLIF(value, '(none)') ...
*** 10344,10349 ****
--- 10480,10496 ----
+ array_sort(anyarray)
+
+
+ anyarray
+ sort elements in an array in ascending order
+ array_sort(ARRAY[3,2,NULL,1])
+ {1,2,3,NULL}
+
+
+
+
array_to_string(anyarray, text , text)
*************** SELECT NULLIF(value, '(none)') ...
*** 10379,10384 ****
--- 10526,10564 ----
+ cardinality(anyarray)
+
+
+ int
+ returns the number of elements in an array
+ cardinality(ARRAY[1,2,3])
+ 3
+
+
+
+
+ set(anyarray)
+
+
+ anyarray
+ remove duplicated elements in an array
+ set(ARRAY[1,3,2,3,NULL,1,NULL])
+ {1,2,3,NULL}
+
+
+
+
+ trim_array(anyarray)
+
+
+ anyarray
+ remove elements at end of an array
+ trim_array(ARRAY[1, 2, 3], 2)
+ {1}
+
+
+
+
unnest(anyarray)
*************** SELECT NULLIF(value, '(none)') ...
*** 10421,10428 ****
See also about the aggregate
! function array_agg for use with arrays.
--- 10601,10615 ----
+ In array_sort, set, and trim_array
+ functions, input arrays are always flattened into one-dimensional arrays.
+ In addition, the lower bounds of the arrays are adjusted to 1.
+
+
+
See also about the aggregate
! function array_agg, collect,
! fusion, and intersection for use with arrays.
*************** SELECT NULLIF(value, '(none)') ...
*** 10468,10474 ****
array_agg(expression)
! any
array of the argument type
--- 10655,10661 ----
array_agg(expression)
! any non-array
array of the argument type
*************** SELECT NULLIF(value, '(none)') ...
*** 10568,10573 ****
--- 10755,10776 ----
+ collect
+
+ collect(expression)
+
+
+ any non-array
+
+
+ array of the argument type
+
+ an alias for array_agg
+
+
+
+
+
count
count(*)
*************** SELECT NULLIF(value, '(none)') ...
*** 10606,10611 ****
--- 10809,10846 ----
+ fusion
+
+ fusion(expression)
+
+
+ any array
+
+
+ same as argument type
+
+ concatenation of input arrays
+
+
+
+
+
+ intersection
+
+ intersection(expression)
+
+
+ any array
+
+
+ same as argument type
+
+ intersection of input arrays
+
+
+
+
+
max
max(expression)
diff --git a/src/backend/nodes/makefuncs.c b/src/backend/nodes/makefuncs.c
index 79da185..df95fee 100644
*** a/src/backend/nodes/makefuncs.c
--- b/src/backend/nodes/makefuncs.c
*************** makeFuncExpr(Oid funcid, Oid rettype, Li
*** 454,459 ****
--- 454,474 ----
}
/*
+ * makeFuncCall -
+ * build a FuncCall node
+ */
+ FuncCall *
+ makeFuncCall(List *funcname, List *args, int location)
+ {
+ FuncCall *n = makeNode(FuncCall);
+
+ n->funcname = funcname;
+ n->args = args;
+ n->location = location;
+ return n;
+ }
+
+ /*
* makeDefElem -
* build a DefElem node
*
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 660947c..1148ad7 100644
*** a/src/backend/parser/gram.y
--- b/src/backend/parser/gram.y
*************** static RangeVar *makeRangeVarFromAnyName
*** 468,474 ****
*/
/* ordinary key words in alphabetical order */
! %token ABORT_P ABSOLUTE_P ACCESS ACTION ADD_P ADMIN AFTER
AGGREGATE ALL ALSO ALTER ALWAYS ANALYSE ANALYZE AND ANY ARRAY AS ASC
ASSERTION ASSIGNMENT ASYMMETRIC AT ATTRIBUTE AUTHORIZATION
--- 468,474 ----
*/
/* ordinary key words in alphabetical order */
! %token A ABORT_P ABSOLUTE_P ACCESS ACTION ADD_P ADMIN AFTER
AGGREGATE ALL ALSO ALTER ALWAYS ANALYSE ANALYZE AND ANY ARRAY AS ASC
ASSERTION ASSIGNMENT ASYMMETRIC AT ATTRIBUTE AUTHORIZATION
*************** static RangeVar *makeRangeVarFromAnyName
*** 511,517 ****
LEAST LEFT LEVEL LIKE LIMIT LISTEN LOAD LOCAL LOCALTIME LOCALTIMESTAMP
LOCATION LOCK_P LOGIN_P
! MAPPING MATCH MAXVALUE MINUTE_P MINVALUE MODE MONTH_P MOVE
NAME_P NAMES NATIONAL NATURAL NCHAR NEXT NO NOCREATEDB
NOCREATEROLE NOCREATEUSER NOINHERIT NOLOGIN_P NONE NOREPLICATION_P
--- 511,517 ----
LEAST LEFT LEVEL LIKE LIMIT LISTEN LOAD LOCAL LOCALTIME LOCALTIMESTAMP
LOCATION LOCK_P LOGIN_P
! MAPPING MATCH MAXVALUE MEMBER MINUTE_P MINVALUE MODE MONTH_P MOVE MULTISET
NAME_P NAMES NATIONAL NATURAL NCHAR NEXT NO NOCREATEDB
NOCREATEROLE NOCREATEUSER NOINHERIT NOLOGIN_P NONE NOREPLICATION_P
*************** static RangeVar *makeRangeVarFromAnyName
*** 535,542 ****
SAVEPOINT SCHEMA SCROLL SEARCH SECOND_P SECURITY SELECT SEQUENCE SEQUENCES
SERIALIZABLE SERVER SESSION SESSION_USER SET SETOF SHARE
SHOW SIMILAR SIMPLE SMALLINT SOME STABLE STANDALONE_P START STATEMENT
! STATISTICS STDIN STDOUT STORAGE STRICT_P STRIP_P SUBSTRING SUPERUSER_P
! SYMMETRIC SYSID SYSTEM_P
TABLE TABLES TABLESPACE TEMP TEMPLATE TEMPORARY TEXT_P THEN TIME TIMESTAMP
TO TRAILING TRANSACTION TREAT TRIGGER TRIM TRUE_P
--- 535,542 ----
SAVEPOINT SCHEMA SCROLL SEARCH SECOND_P SECURITY SELECT SEQUENCE SEQUENCES
SERIALIZABLE SERVER SESSION SESSION_USER SET SETOF SHARE
SHOW SIMILAR SIMPLE SMALLINT SOME STABLE STANDALONE_P START STATEMENT
! STATISTICS STDIN STDOUT STORAGE STRICT_P STRIP_P SUBMULTISET SUBSTRING
! SUPERUSER_P SYMMETRIC SYSID SYSTEM_P
TABLE TABLES TABLESPACE TEMP TEMPLATE TEMPORARY TEXT_P THEN TIME TIMESTAMP
TO TRAILING TRANSACTION TREAT TRIGGER TRIM TRUE_P
*************** static RangeVar *makeRangeVarFromAnyName
*** 605,610 ****
--- 605,611 ----
%nonassoc NOTNULL
%nonassoc ISNULL
%nonassoc IS NULL_P TRUE_P FALSE_P UNKNOWN /* sets precedence for IS NULL, etc */
+ %nonassoc MEMBER MULTISET SUBMULTISET
%left '+' '-'
%left '*' '/' '%'
%left '^'
*************** a_expr: c_expr { $$ = $1; }
*** 9584,9589 ****
--- 9585,9643 ----
list_make1($1), @2),
@2);
}
+ | a_expr IS A SET
+ {
+ $$ = (Node *) makeFuncCall(
+ SystemFuncName("is_a_set"),
+ list_make1($1), @2);
+ }
+ | a_expr IS NOT A SET
+ {
+ $$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL,
+ (Node *) makeFuncCall(
+ SystemFuncName("is_a_set"),
+ list_make1($1), @2), @2);
+ }
+ | a_expr MEMBER OF a_expr %prec MEMBER
+ {
+ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP_ANY,
+ "=", $1, $4, @2);
+ }
+ | a_expr NOT MEMBER OF a_expr %prec MEMBER
+ {
+ $$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL,
+ (Node *) makeSimpleA_Expr(AEXPR_OP_ANY, "=",
+ $1, $5, @2), @2);
+ }
+ | a_expr SUBMULTISET OF a_expr %prec SUBMULTISET
+ {
+ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP,
+ "<&", $1, $4, @2);
+ }
+ | a_expr NOT SUBMULTISET OF a_expr %prec SUBMULTISET
+ {
+ $$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL,
+ (Node *) makeSimpleA_Expr(AEXPR_OP,
+ "<&", $1, $5, @2), @2);
+ }
+ | a_expr MULTISET UNION opt_all a_expr
+ {
+ $$ = (Node *) makeFuncCall(
+ SystemFuncName("multiset_union"),
+ list_make3($1, $5, makeBoolAConst($4, -1)), @2);
+ }
+ | a_expr MULTISET INTERSECT opt_all a_expr
+ {
+ $$ = (Node *) makeFuncCall(
+ SystemFuncName("multiset_intersect"),
+ list_make3($1, $5, makeBoolAConst($4, -1)), @2);
+ }
+ | a_expr MULTISET EXCEPT opt_all a_expr
+ {
+ $$ = (Node *) makeFuncCall(
+ SystemFuncName("multiset_except"),
+ list_make3($1, $5, makeBoolAConst($4, -1)), @2);
+ }
;
/*
*************** ColLabel: IDENT { $$ = $1; }
*** 11294,11300 ****
/* "Unreserved" keywords --- available for use as any kind of name.
*/
unreserved_keyword:
! ABORT_P
| ABSOLUTE_P
| ACCESS
| ACTION
--- 11348,11355 ----
/* "Unreserved" keywords --- available for use as any kind of name.
*/
unreserved_keyword:
! A
! | ABORT_P
| ABSOLUTE_P
| ACCESS
| ACTION
*************** unreserved_keyword:
*** 11421,11431 ****
--- 11476,11488 ----
| MAPPING
| MATCH
| MAXVALUE
+ | MEMBER
| MINUTE_P
| MINVALUE
| MODE
| MONTH_P
| MOVE
+ | MULTISET
| NAME_P
| NAMES
| NEXT
*************** unreserved_keyword:
*** 11513,11518 ****
--- 11570,11576 ----
| STORAGE
| STRICT_P
| STRIP_P
+ | SUBMULTISET
| SUPERUSER_P
| SYSID
| SYSTEM_P
diff --git a/src/backend/utils/adt/array_userfuncs.c b/src/backend/utils/adt/array_userfuncs.c
index 499d357..412f6d8 100644
*** a/src/backend/utils/adt/array_userfuncs.c
--- b/src/backend/utils/adt/array_userfuncs.c
***************
*** 15,21 ****
--- 15,26 ----
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
+ #include "utils/typcache.h"
+ static Datum array_cat_internal(PG_FUNCTION_ARGS, bool flatten);
+ static ArrayType *array_flatten(ArrayType *array);
+ static void check_concatenable(Oid element_type1, Oid element_type2);
+ static void check_comparable(Oid element_type1, Oid element_type2);
/*-----------------------------------------------------------------------------
* array_push :
*************** array_push(PG_FUNCTION_ARGS)
*** 168,173 ****
--- 173,184 ----
Datum
array_cat(PG_FUNCTION_ARGS)
{
+ return array_cat_internal(fcinfo, false);
+ }
+
+ static Datum
+ array_cat_internal(PG_FUNCTION_ARGS, bool flatten)
+ {
ArrayType *v1,
*v2;
ArrayType *result;
*************** array_cat(PG_FUNCTION_ARGS)
*** 203,213 ****
--- 214,228 ----
if (PG_ARGISNULL(1))
PG_RETURN_NULL();
result = PG_GETARG_ARRAYTYPE_P(1);
+ if (flatten)
+ result = array_flatten(result);
PG_RETURN_ARRAYTYPE_P(result);
}
if (PG_ARGISNULL(1))
{
result = PG_GETARG_ARRAYTYPE_P(0);
+ if (flatten)
+ result = array_flatten(result);
PG_RETURN_ARRAYTYPE_P(result);
}
*************** array_cat(PG_FUNCTION_ARGS)
*** 218,231 ****
element_type2 = ARR_ELEMTYPE(v2);
/* Check we have matching element types */
! if (element_type1 != element_type2)
! ereport(ERROR,
! (errcode(ERRCODE_DATATYPE_MISMATCH),
! errmsg("cannot concatenate incompatible arrays"),
! errdetail("Arrays with element types %s and %s are not "
! "compatible for concatenation.",
! format_type_be(element_type1),
! format_type_be(element_type2))));
/* OK, use it */
element_type = element_type1;
--- 233,239 ----
element_type2 = ARR_ELEMTYPE(v2);
/* Check we have matching element types */
! check_concatenable(element_type1, element_type2);
/* OK, use it */
element_type = element_type1;
*************** array_cat(PG_FUNCTION_ARGS)
*** 249,261 ****
* if both are empty, return the first one
*/
if (ndims1 == 0 && ndims2 > 0)
PG_RETURN_ARRAYTYPE_P(v2);
if (ndims2 == 0)
PG_RETURN_ARRAYTYPE_P(v1);
/* the rest fall under rule 3, 4, or 5 */
! if (ndims1 != ndims2 &&
ndims1 != ndims2 - 1 &&
ndims1 != ndims2 + 1)
ereport(ERROR,
--- 257,278 ----
* if both are empty, return the first one
*/
if (ndims1 == 0 && ndims2 > 0)
+ {
+ if (flatten)
+ v2 = array_flatten(v2);
PG_RETURN_ARRAYTYPE_P(v2);
+ }
if (ndims2 == 0)
+ {
+ if (flatten)
+ v1 = array_flatten(v1);
PG_RETURN_ARRAYTYPE_P(v1);
+ }
/* the rest fall under rule 3, 4, or 5 */
! if (!flatten &&
! ndims1 != ndims2 &&
ndims1 != ndims2 - 1 &&
ndims1 != ndims2 + 1)
ereport(ERROR,
*************** array_cat(PG_FUNCTION_ARGS)
*** 279,285 ****
ndatabytes1 = ARR_SIZE(v1) - ARR_DATA_OFFSET(v1);
ndatabytes2 = ARR_SIZE(v2) - ARR_DATA_OFFSET(v2);
! if (ndims1 == ndims2)
{
/*
* resulting array is made up of the elements (possibly arrays
--- 296,310 ----
ndatabytes1 = ARR_SIZE(v1) - ARR_DATA_OFFSET(v1);
ndatabytes2 = ARR_SIZE(v2) - ARR_DATA_OFFSET(v2);
! if (flatten)
! {
! ndims = 1;
! dims = (int *) palloc(sizeof(int));
! lbs = (int *) palloc(sizeof(int));
! dims[0] = nitems1 + nitems2;
! lbs[0] = 1;
! }
! else if (ndims1 == ndims2)
{
/*
* resulting array is made up of the elements (possibly arrays
*************** array_agg_finalfn(PG_FUNCTION_ARGS)
*** 544,546 ****
--- 569,1427 ----
PG_RETURN_DATUM(result);
}
+
+ /*
+ * array_cardinality :
+ * Return the number of elements in an array.
+ */
+ Datum
+ array_cardinality(PG_FUNCTION_ARGS)
+ {
+ ArrayType *v = PG_GETARG_ARRAYTYPE_P(0);
+ int nitems;
+
+ nitems = ArrayGetNItems(ARR_NDIM(v), ARR_DIMS(v));
+
+ PG_RETURN_INT32(nitems);
+ }
+
+ /*
+ * trim_array :
+ * Remove elements at end of an array. Multi-dimensional array is
+ * flattened into one-dimensional array.
+ */
+ Datum
+ trim_array(PG_FUNCTION_ARGS)
+ {
+ ArrayType *array;
+ ArrayType *result;
+ ArrayType *v;
+ int32 ntrimmed = PG_GETARG_INT32(1);
+ int nitems;
+ int arrtyplen;
+ Oid elmtype;
+ int16 elmlen;
+ bool elmbyval;
+ char elmalign;
+ int lower;
+ int upper;
+
+ if (ntrimmed < 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_ARRAY_ELEMENT_ERROR),
+ errmsg("number of trimmed elements (%d) must not be negative", ntrimmed)));
+
+ array = PG_GETARG_ARRAYTYPE_P(0);
+
+ nitems = ArrayGetNItems(ARR_NDIM(array), ARR_DIMS(array));
+ if (ntrimmed > nitems)
+ ereport(ERROR,
+ (errcode(ERRCODE_ARRAY_ELEMENT_ERROR),
+ errmsg("number of trimmed elements (%d) is greater than cardinality of collection (%d)", ntrimmed, nitems)));
+
+ v = array_flatten(array);
+ arrtyplen = get_typlen(get_fn_expr_argtype(fcinfo->flinfo, 0));
+ lower = ARR_LBOUND(v)[0];
+ upper = ARR_DIMS(v)[0] - ntrimmed;
+ elmtype = ARR_ELEMTYPE(v);
+ get_typlenbyvalalign(elmtype, &elmlen, &elmbyval, &elmalign);
+ result = array_get_slice(
+ v, 1, &upper, &lower, arrtyplen, elmlen, elmbyval, elmalign);
+
+ PG_FREE_IF_COPY(array, 0);
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+
+ /*
+ * Find TypeCacheEntry with comparison functions for element_type.
+ * We arrange to look up the compare functions only once per series of
+ * calls, assuming the element type doesn't change underneath us.
+ */
+ static TypeCacheEntry *
+ get_type_cache(Oid element_type, void **fn_extra)
+ {
+ TypeCacheEntry *type;
+
+ type = (TypeCacheEntry *) *fn_extra;
+ if (type == NULL ||
+ type->type_id != element_type)
+ {
+ type = lookup_type_cache(element_type,
+ TYPECACHE_EQ_OPR_FINFO | TYPECACHE_CMP_PROC_FINFO);
+ if (!OidIsValid(type->eq_opr_finfo.fn_oid) ||
+ !OidIsValid(type->cmp_proc_finfo.fn_oid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("could not identify comparison functions for type %s",
+ format_type_be(element_type))));
+ *fn_extra = type;
+ }
+
+ return type;
+ }
+
+ static int
+ compare_elements(const void *a, const void *b, void *arg)
+ {
+ return DatumGetInt32(FunctionCall2(
+ (FmgrInfo *) arg, *(const Datum *) a, *(const Datum *) b));
+ }
+
+ /*
+ * Sort values and move nulls to the end.
+ * Returns number of non-null elements as an option.
+ */
+ static void
+ sort_elements(TypeCacheEntry *type, Datum *values, bool *nulls,
+ int nitems, int *nonnulls)
+ {
+ int n,
+ i;
+
+ if (nulls == NULL)
+ n = nitems;
+ else
+ {
+ /* move nulls to end of the array */
+ for (i = n = 0; i < nitems; i++)
+ {
+ if (!nulls[i])
+ {
+ values[n] = values[i];
+ nulls[n] = false;
+ n++;
+ }
+ }
+ for (i = n; i < nitems; i++)
+ nulls[i] = true;
+ }
+
+ /* sort non-null values */
+ qsort_arg(values, n, sizeof(Datum),
+ compare_elements, &type->cmp_proc_finfo);
+
+ if (nonnulls)
+ *nonnulls = n;
+ }
+
+ /*
+ * Remove duplicated values in already sorted elements. The values, nulls,
+ * nitems, and nonnulls parameters are modified directly. Note that only
+ * one null value will be kept in the result when there are some nulls.
+ */
+ static void
+ unique_elements(Datum *values, bool *nulls, int *nitems, int *nonnulls,
+ TypeCacheEntry *type)
+ {
+ int i,
+ n,
+ nvalues = *nonnulls;
+ bool has_nulls = (*nonnulls < *nitems);
+
+ for (i = n = 1; i < nvalues; i++)
+ {
+ if (!DatumGetBool(FunctionCall2(
+ &type->eq_opr_finfo, values[i - 1], values[i])))
+ {
+ Assert(!nulls[n]);
+ values[n++] = values[i];
+ }
+ }
+ *nonnulls = n;
+ if (has_nulls)
+ nulls[n++] = true;
+ *nitems = n;
+ }
+
+ /*
+ * Deconstruct an array to a list of elements and sort them. Returns values,
+ * null, number of all elements and non-null elements as output parameters.
+ * nulls and nonnulls can be NULLs.
+ */
+ static void
+ deconstruct_and_sort(ArrayType *array, Datum **values, bool **nulls,
+ int *nitems, int *nonnulls, TypeCacheEntry *type)
+ {
+ Oid element_type = ARR_ELEMTYPE(array);
+ bool *tmp_nulls;
+
+ AssertArg(values != NULL);
+ AssertArg(nitems != NULL);
+
+ deconstruct_array(array,
+ element_type,
+ type->typlen,
+ type->typbyval,
+ type->typalign,
+ values, &tmp_nulls, nitems);
+ sort_elements(type, *values, tmp_nulls, *nitems, nonnulls);
+
+ if (nulls)
+ *nulls = tmp_nulls;
+ }
+
+ /*
+ * A worker for array_sort, array_to_set, and higher-level functions.
+ */
+ static ArrayType *
+ sort_or_unique(ArrayType *array, bool unique, void **fn_extra)
+ {
+ TypeCacheEntry *type;
+ Datum *values;
+ bool *nulls;
+ int nitems,
+ nonnulls;
+ int lbs = 1;
+ Oid element_type = ARR_ELEMTYPE(array);
+
+ type = get_type_cache(element_type, fn_extra);
+ deconstruct_and_sort(array, &values, &nulls, &nitems, &nonnulls, type);
+ if (unique)
+ unique_elements(values, nulls, &nitems, &nonnulls, type);
+
+ return construct_md_array(values, nulls, 1, &nitems, &lbs, element_type,
+ type->typlen, type->typbyval, type->typalign);
+ }
+
+ /*
+ * array_sort :
+ * Sort an array in ascending order. Nulls are in the last.
+ */
+ Datum
+ array_sort(PG_FUNCTION_ARGS)
+ {
+ ArrayType *array = PG_GETARG_ARRAYTYPE_P(0);
+ ArrayType *result;
+
+ result = sort_or_unique(array, false, &fcinfo->flinfo->fn_extra);
+ PG_FREE_IF_COPY(array, 0);
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+
+ /*
+ * array_to_set :
+ * Remove duplicated elements in an array.
+ */
+ Datum
+ array_to_set(PG_FUNCTION_ARGS)
+ {
+ ArrayType *array = PG_GETARG_ARRAYTYPE_P(0);
+ ArrayType *result;
+
+ result = sort_or_unique(array, true, &fcinfo->flinfo->fn_extra);
+ PG_FREE_IF_COPY(array, 0);
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+
+ /*
+ * array_is_set :
+ * Return true iff an array has not duplicated values. Note that
+ * only one null is allowed in a set.
+ */
+ Datum
+ array_is_set(PG_FUNCTION_ARGS)
+ {
+ ArrayType *array = PG_GETARG_ARRAYTYPE_P(0);
+ bool result;
+ Datum *values;
+ int nitems,
+ nonnulls;
+ int i;
+ TypeCacheEntry *type;
+
+ type = get_type_cache(ARR_ELEMTYPE(array), &fcinfo->flinfo->fn_extra);
+ deconstruct_and_sort(array, &values, NULL, &nitems, &nonnulls, type);
+ if (nitems > nonnulls + 1)
+ {
+ /* only one null is allowd */
+ result = false;
+ }
+ else
+ {
+ result = true;
+ /* compare for each adjacent */
+ for (i = 1; i < nonnulls; i++)
+ {
+ if (DatumGetBool(FunctionCall2(
+ &type->eq_opr_finfo, values[i - 1], values[i])))
+ {
+ result = false;
+ break;
+ }
+ }
+ }
+
+ PG_FREE_IF_COPY(array, 0);
+ PG_RETURN_BOOL(result);
+ }
+
+ static Datum
+ submultiset_internal(PG_FUNCTION_ARGS, int arg_contained, int arg_contains)
+ {
+ ArrayType *v1 = NULL;
+ ArrayType *v2 = NULL;
+ bool result = false;
+ bool result_null = false;
+ Oid element_type;
+ Datum *values1,
+ *values2;
+ int nitems1,
+ nitems2,
+ nonnulls1,
+ nonnulls2,
+ n1,
+ n2,
+ unmatch;
+ TypeCacheEntry *type;
+
+ /* always null when v1 is null */
+ if (PG_ARGISNULL(arg_contained))
+ {
+ result_null = true;
+ goto ok;
+ }
+
+ v1 = PG_GETARG_ARRAYTYPE_P(arg_contained);
+ nitems1 = ArrayGetNItems(ARR_NDIM(v1), ARR_DIMS(v1));
+
+ /* null when v2 is null, but false when v1 is empty */
+ if (PG_ARGISNULL(arg_contains))
+ {
+ if (nitems1 == 0)
+ result = true;
+ else
+ result_null = true;
+ goto ok;
+ }
+
+ v2 = PG_GETARG_ARRAYTYPE_P(arg_contains);
+ element_type = ARR_ELEMTYPE(v1);
+ check_comparable(element_type, ARR_ELEMTYPE(v2));
+
+ /* true when v1 is empty whether v2 is null or not */
+ if (nitems1 == 0)
+ {
+ result = true;
+ goto ok;
+ }
+
+ /* false when v1 has more elements than v2 */
+ nitems2 = ArrayGetNItems(ARR_NDIM(v2), ARR_DIMS(v2));
+ if (nitems1 > nitems2)
+ {
+ result = false;
+ goto ok;
+ }
+
+ /* compare non-null elements */
+ type = get_type_cache(element_type, &fcinfo->flinfo->fn_extra);
+ deconstruct_and_sort(v1, &values1, NULL, &nitems1, &nonnulls1, type);
+ deconstruct_and_sort(v2, &values2, NULL, &nitems2, &nonnulls2, type);
+
+ unmatch = 0;
+ for (n1 = n2 = 0;
+ n1 < nonnulls1 && unmatch <= nitems2 - nonnulls2 && n2 < nonnulls2;)
+ {
+ int r = DatumGetInt32(FunctionCall2(&type->cmp_proc_finfo,
+ values1[n1], values2[n2]));
+ if (r < 0)
+ unmatch++;
+ if (r <= 0)
+ n1++;
+ if (r >= 0)
+ n2++;
+ }
+
+ unmatch += nonnulls1 - n1;
+ if (unmatch == 0 && nitems1 - nonnulls1 <= 0)
+ result = true;
+ else if (unmatch > nitems2 - nonnulls2)
+ result = false;
+ else
+ result_null = true; /* v2 has equal or more nulls than unmatches */
+
+ ok:
+ if (v1 != NULL)
+ PG_FREE_IF_COPY(v1, arg_contained);
+ if (v2 != NULL)
+ PG_FREE_IF_COPY(v2, arg_contains);
+
+ if (result_null)
+ PG_RETURN_NULL();
+ else
+ PG_RETURN_BOOL(result);
+ }
+
+ /*
+ * submultiset_of : SUBMULTISET OF
+ * Return true iff v1 is a subset of v2,
+ */
+ Datum
+ submultiset_of(PG_FUNCTION_ARGS)
+ {
+ return submultiset_internal(fcinfo, 0, 1);
+ }
+
+ /*
+ * supermultiset_of
+ * Commutator for SUBMULTISET OF
+ */
+ Datum
+ supermultiset_of(PG_FUNCTION_ARGS)
+ {
+ return submultiset_internal(fcinfo, 1, 0);
+ }
+
+ /*
+ * multiset_union : MULTISET UNION [ DISTINCT | ALL ]
+ * Concatinate two arrays, and optionally remove duplicated values.
+ */
+ Datum
+ multiset_union(PG_FUNCTION_ARGS)
+ {
+ ArrayType *v1,
+ *v2;
+ bool all = PG_GETARG_BOOL(2);
+ ArrayType *result;
+ Datum *values,
+ *values1,
+ *values2;
+ bool *nulls,
+ *nulls1,
+ *nulls2;
+ int nitems,
+ nitems1,
+ nitems2,
+ nonnulls;
+ Oid element_type1,
+ element_type2;
+ int lbs = 1;
+ TypeCacheEntry *type;
+
+ if (PG_ARGISNULL(0) && PG_ARGISNULL(1))
+ PG_RETURN_NULL();
+
+ /* fast path for UNION ALL */
+ if (all)
+ return array_cat_internal(fcinfo, true);
+
+ /* Concatenating a null array is a no-op, just return the other input */
+ if (PG_ARGISNULL(0))
+ {
+ v2 = PG_GETARG_ARRAYTYPE_P(1);
+ result = sort_or_unique(v2, true, &fcinfo->flinfo->fn_extra);
+ PG_FREE_IF_COPY(v2, 1);
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+ if (PG_ARGISNULL(1))
+ {
+ v1 = PG_GETARG_ARRAYTYPE_P(0);
+ result = sort_or_unique(v1, true, &fcinfo->flinfo->fn_extra);
+ PG_FREE_IF_COPY(v1, 0);
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+
+ v1 = PG_GETARG_ARRAYTYPE_P(0);
+ v2 = PG_GETARG_ARRAYTYPE_P(1);
+ element_type1 = ARR_ELEMTYPE(v1);
+ element_type2 = ARR_ELEMTYPE(v2);
+
+ check_concatenable(element_type1, element_type2);
+ type = get_type_cache(element_type1, &fcinfo->flinfo->fn_extra);
+ deconstruct_array(v1,
+ element_type1,
+ type->typlen,
+ type->typbyval,
+ type->typalign,
+ &values1, &nulls1, &nitems1);
+ deconstruct_array(v2,
+ element_type2,
+ type->typlen,
+ type->typbyval,
+ type->typalign,
+ &values2, &nulls2, &nitems2);
+
+ nitems = nitems1 + nitems2;
+ values = (Datum *) palloc(sizeof(Datum) * nitems);
+ nulls = (bool *) palloc(sizeof(bool) * nitems);
+
+ memcpy(values, values1, sizeof(Datum) * nitems1);
+ memcpy(values + nitems1, values2, sizeof(Datum) * nitems2);
+ memcpy(nulls, nulls1, sizeof(bool) * nitems1);
+ memcpy(nulls + nitems1, nulls2, sizeof(bool) * nitems2);
+
+ sort_elements(type, values, nulls, nitems, &nonnulls);
+ unique_elements(values, nulls, &nitems, &nonnulls, type);
+ result = construct_md_array(values, nulls, 1, &nitems, &lbs,
+ element_type1,
+ type->typlen,
+ type->typbyval,
+ type->typalign);
+
+ PG_FREE_IF_COPY(v1, 0);
+ PG_FREE_IF_COPY(v2, 1);
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+
+ /*
+ * Intersection of two sorted arrays. The first array is modified directly.
+ * Return length of the result.
+ */
+ static int
+ intersect_sorted_arrays(TypeCacheEntry *type,
+ Datum *values1, bool *nulls1, int nitems1,
+ const Datum *values2, const bool *nulls2, int nitems2)
+ {
+ int n1,
+ n2,
+ n;
+
+ /* add non-nulls */
+ for (n = n1 = n2 = 0;
+ n1 < nitems1 && !nulls1[n1] &&
+ n2 < nitems2 && !nulls2[n2];)
+ {
+ int r = DatumGetInt32(FunctionCall2(&type->cmp_proc_finfo,
+ values1[n1], values2[n2]));
+ if (r == 0)
+ values1[n++] = values1[n1];
+ if (r <= 0)
+ n1++;
+ if (r >= 0)
+ n2++;
+ }
+
+ /* skip non-nulls */
+ for (; n1 < nitems1 && !nulls1[n1]; n1++) {}
+ for (; n2 < nitems2 && !nulls2[n2]; n2++) {}
+
+ /* add nulls */
+ for (; n1 < nitems1 && n2 < nitems2; n1++, n2++, n++)
+ nulls1[n] = true;
+
+ return n;
+ }
+
+ /*
+ * multiset_intersect : MULTISET INTERSECT [ DISTINCT | ALL ]
+ * Intersection of two arrays, and optionally remove duplicated values.
+ */
+ Datum
+ multiset_intersect(PG_FUNCTION_ARGS)
+ {
+ ArrayType *v1 = PG_GETARG_ARRAYTYPE_P(0);
+ ArrayType *v2 = PG_GETARG_ARRAYTYPE_P(1);
+ bool all = PG_GETARG_BOOL(2);
+
+ ArrayType *result;
+ Oid element_type = ARR_ELEMTYPE(v1);
+ Datum *values1,
+ *values2;
+ bool *nulls1,
+ *nulls2;
+ int nitems1,
+ nitems2,
+ nonnulls1,
+ nonnulls2;
+ int lbs = 1;
+ TypeCacheEntry *type;
+
+ check_comparable(element_type, ARR_ELEMTYPE(v2));
+ type = get_type_cache(element_type, &fcinfo->flinfo->fn_extra);
+
+ deconstruct_and_sort(v1, &values1, &nulls1, &nitems1, &nonnulls1, type);
+ if (!all)
+ unique_elements(values1, nulls1, &nitems1, &nonnulls1, type);
+ deconstruct_and_sort(v2, &values2, &nulls2, &nitems2, &nonnulls2, type);
+ if (!all)
+ unique_elements(values2, nulls2, &nitems2, &nonnulls2, type);
+
+ nitems1 = intersect_sorted_arrays(type,
+ values1, nulls1, nitems1,
+ values2, nulls2, nitems2);
+ result = construct_md_array(values1, nulls1, 1, &nitems1, &lbs,
+ element_type, type->typlen,
+ type->typbyval, type->typalign);
+
+ PG_FREE_IF_COPY(v1, 0);
+ PG_FREE_IF_COPY(v2, 1);
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+
+ /*
+ * multiset_except : MULTISET EXCEPT [ DISTINCT | ALL ]
+ * Subtraction of two arrays, and optionally remove duplicated values.
+ */
+ Datum
+ multiset_except(PG_FUNCTION_ARGS)
+ {
+ ArrayType *v1;
+ ArrayType *v2;
+ bool all;
+ ArrayType *result;
+ Oid element_type;
+ Datum *values1,
+ *values2;
+ bool *nulls1,
+ *nulls2;
+ int nitems1,
+ nitems2,
+ nonnulls1,
+ nonnulls2;
+ int n1,
+ n2,
+ n;
+ int lbs = 1;
+ TypeCacheEntry *type;
+
+ if (PG_ARGISNULL(0))
+ PG_RETURN_NULL();
+
+ v1 = PG_GETARG_ARRAYTYPE_P(0);
+ all = PG_GETARG_BOOL(2);
+
+ /* fast path for except null */
+ if (PG_ARGISNULL(1))
+ {
+ if (all)
+ PG_RETURN_ARRAYTYPE_P(array_flatten(v1));
+
+ result = sort_or_unique(v1, false, &fcinfo->flinfo->fn_extra);
+ PG_FREE_IF_COPY(v1, 0);
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+
+ v2 = PG_GETARG_ARRAYTYPE_P(1);
+ element_type = ARR_ELEMTYPE(v1);
+ check_concatenable(element_type, ARR_ELEMTYPE(v2));
+ type = get_type_cache(element_type, &fcinfo->flinfo->fn_extra);
+
+ deconstruct_and_sort(v1, &values1, &nulls1, &nitems1, &nonnulls1, type);
+ if (!all)
+ unique_elements(values1, nulls1, &nitems1, &nonnulls1, type);
+ deconstruct_and_sort(v2, &values2, &nulls2, &nitems2, &nonnulls2, type);
+ if (!all)
+ unique_elements(values2, nulls2, &nitems2, &nonnulls2, type);
+
+ /* add non-nulls */
+ for (n = n1 = n2 = 0; n1 < nonnulls1 && n2 < nonnulls2;)
+ {
+ int r = DatumGetInt32(FunctionCall2(&type->cmp_proc_finfo,
+ values1[n1], values2[n2]));
+ if (r < 0)
+ values1[n++] = values1[n1++];
+ else
+ n2++;
+ if (r == 0)
+ n1++;
+ }
+ for (; n1 < nonnulls1; n1++, n++)
+ values1[n] = values1[n1];
+
+ /* add nulls */
+ for (n1 = nonnulls1; n1 < nitems1 - (nitems2 - nonnulls2); n1++, n++)
+ nulls1[n] = true;
+
+ result = construct_md_array(values1, nulls1, 1, &n, &lbs, element_type,
+ type->typlen, type->typbyval, type->typalign);
+
+ PG_FREE_IF_COPY(v1, 0);
+ PG_FREE_IF_COPY(v2, 1);
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+
+ /*
+ * fusion aggregate function :
+ * Similar to array_agg, but the input values are arrays.
+ */
+ Datum
+ fusion_transfn(PG_FUNCTION_ARGS)
+ {
+ MemoryContext aggcontext;
+ ArrayBuildState *state;
+
+ if (!AggCheckCallContext(fcinfo, &aggcontext))
+ {
+ /* cannot be called directly because of internal-type argument */
+ elog(ERROR, "fusion_transfn called in non-aggregate context");
+ }
+
+ state = PG_ARGISNULL(0) ? NULL : (ArrayBuildState *) PG_GETARG_POINTER(0);
+ if (!PG_ARGISNULL(1))
+ {
+ ArrayType *v = PG_GETARG_ARRAYTYPE_P(1);
+ Oid elmtype;
+ int16 elmlen;
+ bool elmbyval;
+ char elmalign;
+ Datum *elems;
+ bool *nulls;
+ int nitems;
+ int i;
+
+ elmtype = ARR_ELEMTYPE(v);
+ get_typlenbyvalalign(elmtype, &elmlen, &elmbyval, &elmalign);
+ deconstruct_array(v, elmtype, elmlen, elmbyval, elmalign,
+ &elems, &nulls, &nitems);
+ for (i = 0; i < nitems; i++)
+ state = accumArrayResult(state, elems[i], nulls[i],
+ elmtype, aggcontext);
+
+ PG_FREE_IF_COPY(v, 1);
+ }
+
+ PG_RETURN_POINTER(state);
+ }
+
+ /*
+ * intersection aggregate function :
+ * Intersection of all input arrays.
+ */
+ typedef struct IntersectState
+ {
+ Oid element_type;
+ int nitems;
+ Datum *values;
+ bool *nulls;
+ } IntersectState;
+
+ Datum
+ intersection_transfn(PG_FUNCTION_ARGS)
+ {
+ MemoryContext aggcontext;
+ IntersectState *state;
+
+ if (!AggCheckCallContext(fcinfo, &aggcontext))
+ {
+ /* cannot be called directly because of internal-type argument */
+ elog(ERROR, "intersection_transfn called in non-aggregate context");
+ }
+
+ state = PG_ARGISNULL(0) ? NULL : (IntersectState *) PG_GETARG_POINTER(0);
+ if (!PG_ARGISNULL(1))
+ {
+ ArrayType *v = PG_GETARG_ARRAYTYPE_P(1);
+ TypeCacheEntry *type;
+
+ type = get_type_cache(ARR_ELEMTYPE(v), &fcinfo->flinfo->fn_extra);
+
+ if (state == NULL)
+ {
+ MemoryContext oldcontext;
+
+ oldcontext = MemoryContextSwitchTo(aggcontext);
+ state = (IntersectState *) palloc(sizeof(IntersectState));
+ state->element_type = ARR_ELEMTYPE(v);
+ deconstruct_and_sort(v, &state->values, &state->nulls,
+ &state->nitems, NULL, type);
+ MemoryContextSwitchTo(oldcontext);
+ }
+ else
+ {
+ Datum *values;
+ bool *nulls;
+ int nitems;
+
+ check_concatenable(state->element_type, ARR_ELEMTYPE(v));
+ deconstruct_and_sort(v, &values, &nulls, &nitems, NULL, type);
+ state->nitems = intersect_sorted_arrays(type,
+ state->values, state->nulls, state->nitems,
+ values, nulls, nitems);
+ }
+
+ PG_FREE_IF_COPY(v, 1);
+ }
+
+ PG_RETURN_POINTER(state);
+ }
+
+ Datum
+ intersection_finalfn(PG_FUNCTION_ARGS)
+ {
+ IntersectState *state;
+ ArrayType *result;
+ int lbs = 1;
+ TypeCacheEntry *type;
+
+ state = PG_ARGISNULL(0) ? NULL : (IntersectState *) PG_GETARG_POINTER(0);
+ if (state == NULL)
+ PG_RETURN_NULL();
+
+ type = get_type_cache(state->element_type, &fcinfo->flinfo->fn_extra);
+ result = construct_md_array(state->values, state->nulls,
+ 1, &state->nitems, &lbs, state->element_type,
+ type->typlen, type->typbyval, type->typalign);
+
+ PG_RETURN_ARRAYTYPE_P(result);
+ }
+
+ /*
+ * Flatten multi-dimensional array into one-dimensional array.
+ * The lower bounds is adjusted to 1.
+ */
+ static ArrayType *
+ array_flatten(ArrayType *array)
+ {
+ ArrayType *result;
+ int ndims = ARR_NDIM(array);
+ int32 dataoffset;
+ int ndatabytes,
+ nbytes;
+ int nitems;
+
+ if (ndims < 1 || (ndims == 1 && ARR_LBOUND(array)[0] == 1))
+ return array;
+
+ nitems = ArrayGetNItems(ndims, ARR_DIMS(array));
+ ndatabytes = ARR_SIZE(array) - ARR_DATA_OFFSET(array);
+ if (ARR_HASNULL(array))
+ {
+ dataoffset = ARR_OVERHEAD_WITHNULLS(1, nitems);
+ nbytes = ndatabytes + dataoffset;
+ }
+ else
+ {
+ dataoffset = 0; /* marker for no null bitmap */
+ nbytes = ndatabytes + ARR_OVERHEAD_NONULLS(1);
+ }
+
+ result = (ArrayType *) palloc(nbytes);
+ SET_VARSIZE(result, nbytes);
+ result->ndim = 1;
+ result->dataoffset = dataoffset;
+ result->elemtype = ARR_ELEMTYPE(array);
+ ARR_DIMS(result)[0] = nitems;
+ ARR_LBOUND(result)[0] = 1;
+ /* data area is arg1 then arg2 */
+ memcpy(ARR_DATA_PTR(result), ARR_DATA_PTR(array), ndatabytes);
+ /* handle the null bitmap if needed */
+ if (ARR_HASNULL(result))
+ array_bitmap_copy(ARR_NULLBITMAP(result), 0,
+ ARR_NULLBITMAP(array), 0, nitems);
+
+ return result;
+ }
+
+ static void
+ check_concatenable(Oid element_type1, Oid element_type2)
+ {
+ if (element_type1 != element_type2)
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot concatenate incompatible arrays"),
+ errdetail("Arrays with element types %s and %s are not compatible for concatenation.",
+ format_type_be(element_type1),
+ format_type_be(element_type2))));
+ }
+
+ static void
+ check_comparable(Oid element_type1, Oid element_type2)
+ {
+ if (element_type1 != element_type2)
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot compare incompatible arrays"),
+ errdetail("Arrays with element types %s and %s are not compatible for comparison.",
+ format_type_be(element_type1),
+ format_type_be(element_type2))));
+ }
diff --git a/src/include/catalog/pg_aggregate.h b/src/include/catalog/pg_aggregate.h
index 26966d2..b1b0171 100644
*** a/src/include/catalog/pg_aggregate.h
--- b/src/include/catalog/pg_aggregate.h
*************** DATA(insert ( 2901 xmlconcat2 - 0
*** 222,227 ****
--- 222,230 ----
/* array */
DATA(insert ( 2335 array_agg_transfn array_agg_finalfn 0 2281 _null_ ));
+ DATA(insert ( 3089 array_agg_transfn array_agg_finalfn 0 2281 _null_ ));
+ DATA(insert ( 3091 fusion_transfn array_agg_finalfn 0 2281 _null_ ));
+ DATA(insert ( 3094 intersection_transfn intersection_finalfn 0 2281 _null_ ));
/* text */
DATA(insert ( 3538 string_agg_transfn string_agg_finalfn 0 2281 _null_ ));
diff --git a/src/include/catalog/pg_operator.h b/src/include/catalog/pg_operator.h
index b69b60a..e76320c 100644
*** a/src/include/catalog/pg_operator.h
--- b/src/include/catalog/pg_operator.h
*************** DATA(insert OID = 2590 ( "|&>" PGNSP
*** 867,872 ****
--- 867,874 ----
DATA(insert OID = 2750 ( "&&" PGNSP PGUID b f f 2277 2277 16 2750 0 arrayoverlap areasel areajoinsel ));
DATA(insert OID = 2751 ( "@>" PGNSP PGUID b f f 2277 2277 16 2752 0 arraycontains contsel contjoinsel ));
DATA(insert OID = 2752 ( "<@" PGNSP PGUID b f f 2277 2277 16 2751 0 arraycontained contsel contjoinsel ));
+ DATA(insert OID = 3095 ( "&>" PGNSP PGUID b f f 2277 2277 16 3096 0 supermultiset_of contsel contjoinsel ));
+ DATA(insert OID = 3096 ( "<&" PGNSP PGUID b f f 2277 2277 16 3095 0 submultiset_of contsel contjoinsel ));
/* capturing operators to preserve pre-8.3 behavior of text concatenation */
DATA(insert OID = 2779 ( "||" PGNSP PGUID b f f 25 2776 25 0 0 textanycat - - ));
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index f8b5d4d..adbebac 100644
*** a/src/include/catalog/pg_proc.h
--- b/src/include/catalog/pg_proc.h
*************** DATA(insert OID = 2334 ( array_agg_fina
*** 1062,1067 ****
--- 1062,1099 ----
DESCR("array_agg final function");
DATA(insert OID = 2335 ( array_agg PGNSP PGUID 12 1 0 0 t f f f f i 1 0 2277 "2283" _null_ _null_ _null_ _null_ aggregate_dummy _null_ _null_ _null_ ));
DESCR("concatenate aggregate input into an array");
+ DATA(insert OID = 3079 ( cardinality PGNSP PGUID 12 1 0 0 f f f t f i 1 0 23 "2277" _null_ _null_ _null_ _null_ array_cardinality _null_ _null_ _null_ ));
+ DESCR("number of elements in array");
+ DATA(insert OID = 3080 ( trim_array PGNSP PGUID 12 1 0 0 f f f t f i 2 0 2277 "2277 23" _null_ _null_ _null_ _null_ trim_array _null_ _null_ _null_ ));
+ DESCR("remove elements end of array");
+ DATA(insert OID = 3081 ( array_sort PGNSP PGUID 12 1 0 0 f f f t f i 1 0 2277 "2277" _null_ _null_ _null_ _null_ array_sort _null_ _null_ _null_ ));
+ DESCR("sort an array in ascending order");
+ DATA(insert OID = 3082 ( set PGNSP PGUID 12 1 0 0 f f f t f i 1 0 2277 "2277" _null_ _null_ _null_ _null_ array_to_set _null_ _null_ _null_ ));
+ DESCR("remove duplicated values in an array");
+ DATA(insert OID = 3083 ( is_a_set PGNSP PGUID 12 1 0 0 f f f t f i 1 0 16 "2277" _null_ _null_ _null_ _null_ array_is_set _null_ _null_ _null_ ));
+ DESCR("no duplicated elements?");
+ DATA(insert OID = 3084 ( submultiset_of PGNSP PGUID 12 1 0 0 f f f f f i 2 0 16 "2277 2277" _null_ _null_ _null_ _null_ submultiset_of _null_ _null_ _null_ ));
+ DESCR("contained as subset?");
+ DATA(insert OID = 3085 ( supermultiset_of PGNSP PGUID 12 1 0 0 f f f f f i 2 0 16 "2277 2277" _null_ _null_ _null_ _null_ supermultiset_of _null_ _null_ _null_ ));
+ DESCR("contains as subset?");
+ DATA(insert OID = 3086 ( multiset_union PGNSP PGUID 12 1 0 0 f f f f f i 3 0 2277 "2277 2277 16" _null_ _null_ _null_ _null_ multiset_union _null_ _null_ _null_ ));
+ DESCR("concatenate two arrays");
+ DATA(insert OID = 3087 ( multiset_intersect PGNSP PGUID 12 1 0 0 f f f t f i 3 0 2277 "2277 2277 16" _null_ _null_ _null_ _null_ multiset_intersect _null_ _null_ _null_ ));
+ DESCR("intersection of two arrays");
+ DATA(insert OID = 3088 ( multiset_except PGNSP PGUID 12 1 0 0 f f f f f i 3 0 2277 "2277 2277 16" _null_ _null_ _null_ _null_ multiset_except _null_ _null_ _null_ ));
+ DESCR("exception of two arrays");
+ DATA(insert OID = 3089 ( collect PGNSP PGUID 12 1 0 0 t f f f f i 1 0 2277 "2283" _null_ _null_ _null_ _null_ aggregate_dummy _null_ _null_ _null_ ));
+ DESCR("concatenate aggregate elements into an array");
+ DATA(insert OID = 3090 ( fusion_transfn PGNSP PGUID 12 1 0 0 f f f f f i 2 0 2281 "2281 2277" _null_ _null_ _null_ _null_ fusion_transfn _null_ _null_ _null_ ));
+ DESCR("fusion transition function");
+ DATA(insert OID = 3091 ( fusion PGNSP PGUID 12 1 0 0 t f f f f i 1 0 2277 "2277" _null_ _null_ _null_ _null_ aggregate_dummy _null_ _null_ _null_ ));
+ DESCR("concatenate aggregate arrays into an array");
+ DATA(insert OID = 3092 ( intersection_transfn PGNSP PGUID 12 1 0 0 f f f f f i 2 0 2281 "2281 2277" _null_ _null_ _null_ _null_ intersection_transfn _null_ _null_ _null_ ));
+ DESCR("intersection transition function");
+ DATA(insert OID = 3093 ( intersection_finalfn PGNSP PGUID 12 1 0 0 f f f f f i 1 0 2277 "2281" _null_ _null_ _null_ _null_ intersection_finalfn _null_ _null_ _null_ ));
+ DESCR("intersection final function");
+ DATA(insert OID = 3094 ( intersection PGNSP PGUID 12 1 0 0 t f f f f i 1 0 2277 "2277" _null_ _null_ _null_ _null_ aggregate_dummy _null_ _null_ _null_ ));
+ DESCR("intersection of all inputs");
DATA(insert OID = 760 ( smgrin PGNSP PGUID 12 1 0 0 f f f t f s 1 0 210 "2275" _null_ _null_ _null_ _null_ smgrin _null_ _null_ _null_ ));
DESCR("I/O");
diff --git a/src/include/nodes/makefuncs.h b/src/include/nodes/makefuncs.h
index 7c41312..b5cd584 100644
*** a/src/include/nodes/makefuncs.h
--- b/src/include/nodes/makefuncs.h
*************** extern TypeName *makeTypeNameFromOid(Oid
*** 71,76 ****
--- 71,77 ----
extern FuncExpr *makeFuncExpr(Oid funcid, Oid rettype,
List *args, CoercionForm fformat);
+ extern FuncCall *makeFuncCall(List *funcname, List *args, int location);
extern DefElem *makeDefElem(char *name, Node *arg);
extern DefElem *makeDefElemExtended(char *nameSpace, char *name, Node *arg,
diff --git a/src/include/parser/kwlist.h b/src/include/parser/kwlist.h
index 578d3cd..5f59d22 100644
*** a/src/include/parser/kwlist.h
--- b/src/include/parser/kwlist.h
***************
*** 26,31 ****
--- 26,32 ----
*/
/* name, value, category */
+ PG_KEYWORD("a", A, UNRESERVED_KEYWORD)
PG_KEYWORD("abort", ABORT_P, UNRESERVED_KEYWORD)
PG_KEYWORD("absolute", ABSOLUTE_P, UNRESERVED_KEYWORD)
PG_KEYWORD("access", ACCESS, UNRESERVED_KEYWORD)
*************** PG_KEYWORD("login", LOGIN_P, UNRESERVED_
*** 232,242 ****
--- 233,245 ----
PG_KEYWORD("mapping", MAPPING, UNRESERVED_KEYWORD)
PG_KEYWORD("match", MATCH, UNRESERVED_KEYWORD)
PG_KEYWORD("maxvalue", MAXVALUE, UNRESERVED_KEYWORD)
+ PG_KEYWORD("member", MEMBER, UNRESERVED_KEYWORD)
PG_KEYWORD("minute", MINUTE_P, UNRESERVED_KEYWORD)
PG_KEYWORD("minvalue", MINVALUE, UNRESERVED_KEYWORD)
PG_KEYWORD("mode", MODE, UNRESERVED_KEYWORD)
PG_KEYWORD("month", MONTH_P, UNRESERVED_KEYWORD)
PG_KEYWORD("move", MOVE, UNRESERVED_KEYWORD)
+ PG_KEYWORD("multiset", MULTISET, UNRESERVED_KEYWORD)
PG_KEYWORD("name", NAME_P, UNRESERVED_KEYWORD)
PG_KEYWORD("names", NAMES, UNRESERVED_KEYWORD)
PG_KEYWORD("national", NATIONAL, COL_NAME_KEYWORD)
*************** PG_KEYWORD("stdout", STDOUT, UNRESERVED_
*** 358,363 ****
--- 361,367 ----
PG_KEYWORD("storage", STORAGE, UNRESERVED_KEYWORD)
PG_KEYWORD("strict", STRICT_P, UNRESERVED_KEYWORD)
PG_KEYWORD("strip", STRIP_P, UNRESERVED_KEYWORD)
+ PG_KEYWORD("submultiset", SUBMULTISET, UNRESERVED_KEYWORD)
PG_KEYWORD("substring", SUBSTRING, COL_NAME_KEYWORD)
PG_KEYWORD("superuser", SUPERUSER_P, UNRESERVED_KEYWORD)
PG_KEYWORD("symmetric", SYMMETRIC, RESERVED_KEYWORD)
diff --git a/src/include/utils/array.h b/src/include/utils/array.h
index 7f7e744..99b52e0 100644
*** a/src/include/utils/array.h
--- b/src/include/utils/array.h
*************** extern ArrayType *create_singleton_array
*** 281,285 ****
--- 281,298 ----
extern Datum array_agg_transfn(PG_FUNCTION_ARGS);
extern Datum array_agg_finalfn(PG_FUNCTION_ARGS);
+ extern Datum array_cardinality(PG_FUNCTION_ARGS);
+ extern Datum trim_array(PG_FUNCTION_ARGS);
+ extern Datum array_sort(PG_FUNCTION_ARGS);
+ extern Datum array_to_set(PG_FUNCTION_ARGS);
+ extern Datum array_is_set(PG_FUNCTION_ARGS);
+ extern Datum submultiset_of(PG_FUNCTION_ARGS);
+ extern Datum supermultiset_of(PG_FUNCTION_ARGS);
+ extern Datum multiset_union(PG_FUNCTION_ARGS);
+ extern Datum multiset_intersect(PG_FUNCTION_ARGS);
+ extern Datum multiset_except(PG_FUNCTION_ARGS);
+ extern Datum fusion_transfn(PG_FUNCTION_ARGS);
+ extern Datum intersection_transfn(PG_FUNCTION_ARGS);
+ extern Datum intersection_finalfn(PG_FUNCTION_ARGS);
#endif /* ARRAY_H */
diff --git a/src/test/regress/expected/arrays.out b/src/test/regress/expected/arrays.out
index 7b05ce3..4276535 100644
*** a/src/test/regress/expected/arrays.out
--- b/src/test/regress/expected/arrays.out
*************** select * from t1;
*** 1558,1560 ****
--- 1558,1772 ----
[5:5]={"(42,43)"}
(1 row)
+ -- MULTISET support
+ SELECT cardinality(ARRAY[1, 2, 3]), cardinality(ARRAY[[1, 2], [3, 4]]);
+ cardinality | cardinality
+ -------------+-------------
+ 3 | 4
+ (1 row)
+
+ SELECT trim_array(ARRAY[1, 2, 3], 0),
+ trim_array(ARRAY[1, 2, 3], 2),
+ trim_array(ARRAY[[1, 2], [3, 4]], 1);
+ trim_array | trim_array | trim_array
+ ------------+------------+------------
+ {1,2,3} | {1} | {1,2,3}
+ (1 row)
+
+ SELECT trim_array(ARRAY[1, 2, 3], -1);
+ ERROR: number of trimmed elements (-1) must not be negative
+ SELECT trim_array(ARRAY[1, 2, 3], 4);
+ ERROR: number of trimmed elements (4) is greater than cardinality of collection (3)
+ SELECT 'B' MEMBER OF ARRAY['A', 'B', 'C'];
+ ?column?
+ ----------
+ t
+ (1 row)
+
+ SELECT 3 MEMBER OF ARRAY[1, 2], 3 MEMBER OF ARRAY[[1, 2], [3, 4]];
+ ?column? | ?column?
+ ----------+----------
+ f | t
+ (1 row)
+
+ SELECT 3 NOT MEMBER OF ARRAY[1, 2];
+ ?column?
+ ----------
+ t
+ (1 row)
+
+ SELECT ARRAY[1, 2] SUBMULTISET OF ARRAY[3, 2, 1];
+ ?column?
+ ----------
+ t
+ (1 row)
+
+ SELECT ARRAY[1, 2] SUBMULTISET OF ARRAY[[1, 3], [2, 4]];
+ ?column?
+ ----------
+ t
+ (1 row)
+
+ SELECT ARRAY[1, 1, 2] SUBMULTISET OF ARRAY[1, 2, 2];
+ ?column?
+ ----------
+ f
+ (1 row)
+
+ SELECT ARRAY['A', 'B', 'C'] SUBMULTISET OF ARRAY['A', 'B', 'D'];
+ ?column?
+ ----------
+ f
+ (1 row)
+
+ SELECT ARRAY['A', 'B', 'C'] NOT SUBMULTISET OF ARRAY['A', 'B', 'D'];
+ ?column?
+ ----------
+ t
+ (1 row)
+
+ SELECT ARRAY[]::int[] SUBMULTISET OF NULL::int[];
+ ?column?
+ ----------
+ t
+ (1 row)
+
+ SELECT NULL::int[] SUBMULTISET OF ARRAY[]::int[];
+ ?column?
+ ----------
+
+ (1 row)
+
+ SELECT NULL::int[] SUBMULTISET OF NULL::int[];
+ ?column?
+ ----------
+
+ (1 row)
+
+ SELECT ARRAY[1, NULL] SUBMULTISET OF ARRAY[1, 2],
+ ARRAY[1, NULL] SUBMULTISET OF ARRAY[2, 3];
+ ?column? | ?column?
+ ----------+----------
+ | f
+ (1 row)
+
+ SELECT ARRAY[1, 2] SUBMULTISET OF ARRAY[1, NULL],
+ ARRAY[1, 2] SUBMULTISET OF ARRAY[3, NULL];
+ ?column? | ?column?
+ ----------+----------
+ | f
+ (1 row)
+
+ SELECT ARRAY[1, NULL] SUBMULTISET OF ARRAY[1, NULL];
+ ?column?
+ ----------
+
+ (1 row)
+
+ SELECT ARRAY[1, 2, 3] SUBMULTISET OF ARRAY[NULL, 1, 2, 3];
+ ?column?
+ ----------
+ t
+ (1 row)
+
+ SELECT ARRAY[1, 2, 3] SUBMULTISET OF ARRAY[1, 2, NULL];
+ ?column?
+ ----------
+
+ (1 row)
+
+ SELECT ARRAY[1, 2, 3] SUBMULTISET OF ARRAY[NULL, 4, NULL];
+ ?column?
+ ----------
+ f
+ (1 row)
+
+ SELECT ARRAY[1, 2, 3] IS A SET;
+ is_a_set
+ ----------
+ t
+ (1 row)
+
+ SELECT ARRAY['A', 'A', 'B'] IS A SET, ARRAY['A', 'A', 'B'] IS NOT A SET;
+ is_a_set | ?column?
+ ----------+----------
+ f | t
+ (1 row)
+
+ SELECT ARRAY[1, NULL] IS A SET, ARRAY[1, NULL, NULL] IS NOT A SET;
+ is_a_set | ?column?
+ ----------+----------
+ t | t
+ (1 row)
+
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET UNION ALL ARRAY[2, NULL];
+ multiset_union
+ --------------------------
+ {2,NULL,1,2,NULL,2,NULL}
+ (1 row)
+
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET UNION ARRAY[2, NULL];
+ multiset_union
+ ----------------
+ {1,2,NULL}
+ (1 row)
+
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET INTERSECT ALL ARRAY[2, NULL];
+ multiset_intersect
+ --------------------
+ {2,NULL}
+ (1 row)
+
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET INTERSECT ARRAY[2, NULL];
+ multiset_intersect
+ --------------------
+ {2,NULL}
+ (1 row)
+
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET EXCEPT ALL ARRAY[2, NULL];
+ multiset_except
+ -----------------
+ {1,2,NULL}
+ (1 row)
+
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET EXCEPT ARRAY[2, NULL];
+ multiset_except
+ -----------------
+ {1}
+ (1 row)
+
+ SELECT collect(s), fusion(a), intersection(a)
+ FROM (VALUES
+ ('A', ARRAY[1, 2, 3, 2, 2]),
+ ('B', ARRAY[1, 2, 4, 2]),
+ ('C', ARRAY[[3, 2], [2, 1]])
+ ) AS t(s, a);
+ collect | fusion | intersection
+ ---------+-----------------------------+--------------
+ {A,B,C} | {1,2,3,2,2,1,2,4,2,3,2,2,1} | {1,2,2}
+ (1 row)
+
+ SELECT array_sort(ARRAY[1, 3, 2, 3, NULL, 1, NULL]);
+ array_sort
+ -----------------------
+ {1,1,2,3,3,NULL,NULL}
+ (1 row)
+
+ SELECT array_sort(ARRAY[['A', 'D'], ['B', 'E'], ['C', 'F']]);
+ array_sort
+ ---------------
+ {A,B,C,D,E,F}
+ (1 row)
+
+ SELECT set(ARRAY[1, 3, 2, 3, NULL, 1, NULL]);
+ set
+ --------------
+ {1,2,3,NULL}
+ (1 row)
+
+ SELECT set(ARRAY[['A', 'C'], ['B', 'C'], ['C', 'A']]);
+ set
+ ---------
+ {A,B,C}
+ (1 row)
+
diff --git a/src/test/regress/sql/arrays.sql b/src/test/regress/sql/arrays.sql
index 9ea53b1..331a86a 100644
*** a/src/test/regress/sql/arrays.sql
--- b/src/test/regress/sql/arrays.sql
*************** insert into t1 (f1[5].q1) values(42);
*** 438,440 ****
--- 438,487 ----
select * from t1;
update t1 set f1[5].q2 = 43;
select * from t1;
+
+ -- MULTISET support
+
+ SELECT cardinality(ARRAY[1, 2, 3]), cardinality(ARRAY[[1, 2], [3, 4]]);
+ SELECT trim_array(ARRAY[1, 2, 3], 0),
+ trim_array(ARRAY[1, 2, 3], 2),
+ trim_array(ARRAY[[1, 2], [3, 4]], 1);
+ SELECT trim_array(ARRAY[1, 2, 3], -1);
+ SELECT trim_array(ARRAY[1, 2, 3], 4);
+ SELECT 'B' MEMBER OF ARRAY['A', 'B', 'C'];
+ SELECT 3 MEMBER OF ARRAY[1, 2], 3 MEMBER OF ARRAY[[1, 2], [3, 4]];
+ SELECT 3 NOT MEMBER OF ARRAY[1, 2];
+ SELECT ARRAY[1, 2] SUBMULTISET OF ARRAY[3, 2, 1];
+ SELECT ARRAY[1, 2] SUBMULTISET OF ARRAY[[1, 3], [2, 4]];
+ SELECT ARRAY[1, 1, 2] SUBMULTISET OF ARRAY[1, 2, 2];
+ SELECT ARRAY['A', 'B', 'C'] SUBMULTISET OF ARRAY['A', 'B', 'D'];
+ SELECT ARRAY['A', 'B', 'C'] NOT SUBMULTISET OF ARRAY['A', 'B', 'D'];
+ SELECT ARRAY[]::int[] SUBMULTISET OF NULL::int[];
+ SELECT NULL::int[] SUBMULTISET OF ARRAY[]::int[];
+ SELECT NULL::int[] SUBMULTISET OF NULL::int[];
+ SELECT ARRAY[1, NULL] SUBMULTISET OF ARRAY[1, 2],
+ ARRAY[1, NULL] SUBMULTISET OF ARRAY[2, 3];
+ SELECT ARRAY[1, 2] SUBMULTISET OF ARRAY[1, NULL],
+ ARRAY[1, 2] SUBMULTISET OF ARRAY[3, NULL];
+ SELECT ARRAY[1, NULL] SUBMULTISET OF ARRAY[1, NULL];
+ SELECT ARRAY[1, 2, 3] SUBMULTISET OF ARRAY[NULL, 1, 2, 3];
+ SELECT ARRAY[1, 2, 3] SUBMULTISET OF ARRAY[1, 2, NULL];
+ SELECT ARRAY[1, 2, 3] SUBMULTISET OF ARRAY[NULL, 4, NULL];
+ SELECT ARRAY[1, 2, 3] IS A SET;
+ SELECT ARRAY['A', 'A', 'B'] IS A SET, ARRAY['A', 'A', 'B'] IS NOT A SET;
+ SELECT ARRAY[1, NULL] IS A SET, ARRAY[1, NULL, NULL] IS NOT A SET;
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET UNION ALL ARRAY[2, NULL];
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET UNION ARRAY[2, NULL];
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET INTERSECT ALL ARRAY[2, NULL];
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET INTERSECT ARRAY[2, NULL];
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET EXCEPT ALL ARRAY[2, NULL];
+ SELECT ARRAY[2, NULL, 1, 2, NULL] MULTISET EXCEPT ARRAY[2, NULL];
+ SELECT collect(s), fusion(a), intersection(a)
+ FROM (VALUES
+ ('A', ARRAY[1, 2, 3, 2, 2]),
+ ('B', ARRAY[1, 2, 4, 2]),
+ ('C', ARRAY[[3, 2], [2, 1]])
+ ) AS t(s, a);
+ SELECT array_sort(ARRAY[1, 3, 2, 3, NULL, 1, NULL]);
+ SELECT array_sort(ARRAY[['A', 'D'], ['B', 'E'], ['C', 'F']]);
+ SELECT set(ARRAY[1, 3, 2, 3, NULL, 1, NULL]);
+ SELECT set(ARRAY[['A', 'C'], ['B', 'C'], ['C', 'A']]);