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Support use of function argument names to identify which actual arguments

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match which function parameters.  The syntax uses AS, for example
	funcname(value AS arg1, anothervalue AS arg2)

Pavel Stehule
This commit is contained in:
Tom Lane
2009-10-08 02:39:25 +00:00
parent 2eda8dfb52
commit 717fa274d1
34 changed files with 1925 additions and 274 deletions
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17
src/backend/optimizer/plan/planner.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.256 2009/06/11 14:48:59 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.257 2009/10/08 02:39:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -526,7 +526,8 @@ preprocess_expression(PlannerInfo *root, Node *expr, int kind)
/*
* Simplify constant expressions.
*
* Note: one essential effect here is to insert the current actual values
* Note: an essential effect of this is to convert named-argument function
* calls to positional notation and insert the current actual values
* of any default arguments for functions. To ensure that happens, we
* *must* process all expressions here. Previous PG versions sometimes
* skipped const-simplification if it didn't seem worth the trouble, but
@ -2658,9 +2659,10 @@ get_column_info_for_window(PlannerInfo *root, WindowClause *wc, List *tlist,
* Currently, we disallow sublinks in standalone expressions, so there's no
* real "planning" involved here. (That might not always be true though.)
* What we must do is run eval_const_expressions to ensure that any function
* default arguments get inserted. The fact that constant subexpressions
* get simplified is a side-effect that is useful when the expression will
* get evaluated more than once. Also, we must fix operator function IDs.
* calls are converted to positional notation and function default arguments
* get inserted. The fact that constant subexpressions get simplified is a
* side-effect that is useful when the expression will get evaluated more than
* once. Also, we must fix operator function IDs.
*
* Note: this must not make any damaging changes to the passed-in expression
* tree. (It would actually be okay to apply fix_opfuncids to it, but since
@ -2672,7 +2674,10 @@ expression_planner(Expr *expr)
{
Node *result;
/* Insert default arguments and simplify constant subexprs */
/*
* Convert named-argument function calls, insert default arguments and
* simplify constant subexprs
*/
result = eval_const_expressions(NULL, (Node *) expr);
/* Fill in opfuncid values if missing */