/*
* similarity_search_expr is used for our multi-mode
* similarity_search, and we just use this for multi
* cols search.
*/
similarity_search_expr:
sub_search_expr '<' AexprConst {
$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $3, @2);
}
;
sub_search_expr:
'[' col_tuple_expr '~' AexprConst ']' {
$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~", $2, $4, @3);
}
;
col_tuple_expr:
columnref { $$ = $1;}
| '(' col_list_expr ')' { $$ = $2;}
;
col_list_expr:
columnref {
ResTarget* target = makeNode(ResTarget);
target->name = NULL;
target->indirection = NIL;
target->val = (Node *) $1;
target->location = @1;
$$ = list_make1(target);
}
| col_list_expr ',' columnref { $$ = lappend($1,$3);}
;
This is my new grammer.
But I get below:
postgres=# select * from t2 where [a ~ 1] < 0;
ERROR: syntax error at or near "~"
LINE 1: select * from t2 where [a ~ 1] < 0;
It’s strange that it can’t parse ‘~’, I add it in the parser.