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Commit912c27f

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Split out everything that looks like a function call from c_expr into
a separate production func_expr. This allows us to accept all thesevariants in the backwards-compatible syntax for creating a functionalindex; which beats documenting exactly which things work and which don't.Interestingly, it also seems to make the generated state machine a littlebit smaller.
1 parent2cda039 commit912c27f

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1 file changed

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-49
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1 file changed

+55
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‎src/backend/parser/gram.y

Lines changed: 55 additions & 49 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
*
1212
*
1313
* IDENTIFICATION
14-
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.475 2004/08/2904:12:35 momjian Exp $
14+
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.476 2004/09/2923:39:20 tgl Exp $
1515
*
1616
* HISTORY
1717
* AUTHORDATEMAJOR EVENT
@@ -272,8 +272,8 @@ static void doNegateFloat(Value *v);
272272
%type<node>columnDef
273273
%type<defelt>def_elem
274274
%type<node>def_argcolumnElemwhere_clause
275-
a_exprb_exprc_exprAexprConstindirection_elcolumnref
276-
in_exprhaving_clausefunc_tablearray_expr
275+
a_exprb_exprc_exprfunc_exprAexprConstindirection_el
276+
columnrefin_exprhaving_clausefunc_tablearray_expr
277277
%type<list>rowtype_listarray_expr_list
278278
%type<node>case_exprcase_argwhen_clausecase_default
279279
%type<list>when_clause_list
@@ -3238,18 +3238,12 @@ index_elem:ColId opt_class
32383238
$$->expr =NULL;
32393239
$$->opclass =$2;
32403240
}
3241-
|func_name'(' expr_list')' opt_class
3241+
|func_expr opt_class
32423242
{
3243-
FuncCall *n = makeNode(FuncCall);
3244-
n->funcname =$1;
3245-
n->args =$3;
3246-
n->agg_star =FALSE;
3247-
n->agg_distinct =FALSE;
3248-
32493243
$$ = makeNode(IndexElem);
32503244
$$->name =NULL;
3251-
$$->expr =(Node *)n;
3252-
$$->opclass =$5;
3245+
$$->expr =$1;
3246+
$$->opclass =$2;
32533247
}
32543248
|'(' a_expr')' opt_class
32553249
{
@@ -6479,7 +6473,55 @@ c_expr:columnref{ $$ = $1; }
64796473
}
64806474
| case_expr
64816475
{$$ =$1; }
6482-
| func_name'('')'
6476+
| func_expr
6477+
{$$ =$1; }
6478+
| select_with_parens%prec UMINUS
6479+
{
6480+
SubLink *n = makeNode(SubLink);
6481+
n->subLinkType = EXPR_SUBLINK;
6482+
n->lefthand = NIL;
6483+
n->operName = NIL;
6484+
n->subselect =$1;
6485+
$$ = (Node *)n;
6486+
}
6487+
| EXISTS select_with_parens
6488+
{
6489+
SubLink *n = makeNode(SubLink);
6490+
n->subLinkType = EXISTS_SUBLINK;
6491+
n->lefthand = NIL;
6492+
n->operName = NIL;
6493+
n->subselect =$2;
6494+
$$ = (Node *)n;
6495+
}
6496+
| ARRAY select_with_parens
6497+
{
6498+
SubLink *n = makeNode(SubLink);
6499+
n->subLinkType = ARRAY_SUBLINK;
6500+
n->lefthand = NIL;
6501+
n->operName = NIL;
6502+
n->subselect =$2;
6503+
$$ = (Node *)n;
6504+
}
6505+
| ARRAY array_expr
6506+
{$$ =$2;}
6507+
| row
6508+
{
6509+
RowExpr *r = makeNode(RowExpr);
6510+
r->args =$1;
6511+
r->row_typeid = InvalidOid;/* not analyzed yet*/
6512+
$$ = (Node *)r;
6513+
}
6514+
;
6515+
6516+
/*
6517+
* func_expr is split out from c_expr just so that we have a classification
6518+
* for "everything that is a function call or looks like one". This isn't
6519+
* very important, but it saves us having to document which variants are
6520+
* legal in the backwards-compatible functional-index syntax for CREATE INDEX.
6521+
* (Note that many of the special SQL functions wouldn't actually make any
6522+
* sense as functional index entries, but we ignore that consideration here.)
6523+
*/
6524+
func_expr:func_name'('')'
64836525
{
64846526
FuncCall *n = makeNode(FuncCall);
64856527
n->funcname =$1;
@@ -6936,42 +6978,6 @@ c_expr:columnref{ $$ = $1; }
69366978
n->agg_distinct =FALSE;
69376979
$$ = (Node *)n;
69386980
}
6939-
| select_with_parens%prec UMINUS
6940-
{
6941-
SubLink *n = makeNode(SubLink);
6942-
n->subLinkType = EXPR_SUBLINK;
6943-
n->lefthand = NIL;
6944-
n->operName = NIL;
6945-
n->subselect =$1;
6946-
$$ = (Node *)n;
6947-
}
6948-
| EXISTS select_with_parens
6949-
{
6950-
SubLink *n = makeNode(SubLink);
6951-
n->subLinkType = EXISTS_SUBLINK;
6952-
n->lefthand = NIL;
6953-
n->operName = NIL;
6954-
n->subselect =$2;
6955-
$$ = (Node *)n;
6956-
}
6957-
| ARRAY select_with_parens
6958-
{
6959-
SubLink *n = makeNode(SubLink);
6960-
n->subLinkType = ARRAY_SUBLINK;
6961-
n->lefthand = NIL;
6962-
n->operName = NIL;
6963-
n->subselect =$2;
6964-
$$ = (Node *)n;
6965-
}
6966-
| ARRAY array_expr
6967-
{$$ =$2;}
6968-
| row
6969-
{
6970-
RowExpr *r = makeNode(RowExpr);
6971-
r->args =$1;
6972-
r->row_typeid = InvalidOid;/* not analyzed yet*/
6973-
$$ = (Node *)r;
6974-
}
69756981
;
69766982

69776983
/*

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