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Come to think of it, functions in FROM have the same syntactic restriction 

as CREATE INDEX did, and can be fixed the same way, for another small
improvement in usability and reduction in grammar size.
This commit is contained in:
Tom Lane 2004-09-30 00:24:27 +00:00
parent 912c27f9c2
commit f065957062
4 changed files with 26 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
src/backend/parser/gram.y
View File

@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.476 2004/09/29 23:39:20 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.477 2004/09/30 00:24:20 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -5368,24 +5368,7 @@ relation_expr:
;
func_table: func_name '(' ')'
{
FuncCall *n = makeNode(FuncCall);
n->funcname = $1;
n->args = NIL;
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
}
| func_name '(' expr_list ')'
{
FuncCall *n = makeNode(FuncCall);
n->funcname = $1;
n->args = $3;
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
}
func_table: func_expr { $$ = $1; }
;
@ -6978,6 +6961,16 @@ func_expr: func_name '(' ')'
n->agg_distinct = FALSE;
$$ = (Node *)n;
}
| NULLIF '(' a_expr ',' a_expr ')'
{
$$ = (Node *) makeSimpleA_Expr(AEXPR_NULLIF, "=", $3, $5);
}
| COALESCE '(' expr_list ')'
{
CoalesceExpr *c = makeNode(CoalesceExpr);
c->args = $3;
$$ = (Node *)c;
}
;
/*
@ -7206,24 +7199,12 @@ in_expr: select_with_parens
| '(' expr_list ')' { $$ = (Node *)$2; }
;
/* Case clause
/*
* Define SQL92-style case clause.
* Allow all four forms described in the standard:
* - Full specification
* CASE WHEN a = b THEN c ... ELSE d END
* - Implicit argument
* CASE a WHEN b THEN c ... ELSE d END
* - Conditional NULL
* NULLIF(x,y)
* same as CASE WHEN x = y THEN NULL ELSE x END
* - Conditional substitution from list, use first non-null argument
* COALESCE(a,b,...)
* same as CASE WHEN a IS NOT NULL THEN a WHEN b IS NOT NULL THEN b ... END
* - thomas 1998-11-09
*
* NULLIF and COALESCE have become first class nodes to
* prevent double evaluation of arguments.
* - Kris Jurka 2003-02-11
*/
case_expr: CASE case_arg when_clause_list case_default END_P
{
@ -7234,16 +7215,6 @@ case_expr: CASE case_arg when_clause_list case_default END_P
c->defresult = (Expr *) $4;
$$ = (Node *)c;
}
| NULLIF '(' a_expr ',' a_expr ')'
{
$$ = (Node *) makeSimpleA_Expr(AEXPR_NULLIF, "=", $3, $5);
}
| COALESCE '(' expr_list ')'
{
CoalesceExpr *c = makeNode(CoalesceExpr);
c->args = $3;
$$ = (Node *)c;
}
;
when_clause_list:

14
src/backend/parser/parse_clause.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_clause.c,v 1.136 2004/08/29 05:06:44 momjian Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_clause.c,v 1.137 2004/09/30 00:24:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -497,12 +497,16 @@ transformRangeFunction(ParseState *pstate, RangeFunction *r)
RangeTblEntry *rte;
RangeTblRef *rtr;
/* Get function name for possible use as alias */
Assert(IsA(r->funccallnode, FuncCall));
funcname = strVal(llast(((FuncCall *) r->funccallnode)->funcname));
/*
* Get function name for possible use as alias. We use the same
* transformation rules as for a SELECT output expression. For a
* FuncCall node, the result will be the function name, but it is
* possible for the grammar to hand back other node types.
*/
funcname = FigureColname(r->funccallnode);
/*
* Transform the raw FuncCall node.
* Transform the raw expression.
*/
funcexpr = transformExpr(pstate, r->funccallnode);

5
src/backend/parser/parse_target.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_target.c,v 1.125 2004/08/29 05:06:44 momjian Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_target.c,v 1.126 2004/09/30 00:24:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -41,7 +41,6 @@ static Node *transformAssignmentIndirection(ParseState *pstate,
static List *ExpandColumnRefStar(ParseState *pstate, ColumnRef *cref);
static List *ExpandAllTables(ParseState *pstate);
static List *ExpandIndirectionStar(ParseState *pstate, A_Indirection *ind);
static char *FigureColname(Node *node);
static int FigureColnameInternal(Node *node, char **name);
@ -893,7 +892,7 @@ ExpandIndirectionStar(ParseState *pstate, A_Indirection *ind)
* Note that the argument is the *untransformed* parse tree for the target
* item. This is a shade easier to work with than the transformed tree.
*/
static char *
char *
FigureColname(Node *node)
{
char *name = NULL;

3
src/include/parser/parse_target.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/parser/parse_target.h,v 1.33 2004/08/29 04:13:09 momjian Exp $
* $PostgreSQL: pgsql/src/include/parser/parse_target.h,v 1.34 2004/09/30 00:24:27 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -27,5 +27,6 @@ extern void updateTargetListEntry(ParseState *pstate, TargetEntry *tle,
List *indirection);
extern List *checkInsertTargets(ParseState *pstate, List *cols,
List **attrnos);
extern char *FigureColname(Node *node);
#endif /* PARSE_TARGET_H */