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Add Oracle-compatible GREATEST and LEAST functions. Pavel Stehule

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This commit is contained in:
Tom Lane
2005-06-26 22:05:42 +00:00
parent d395aecffa
commit 943b396245
17 changed files with 409 additions and 36 deletions
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20
src/backend/optimizer/util/clauses.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.198 2005/06/05 22:32:56 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.199 2005/06/26 22:05:38 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -542,6 +542,8 @@ expression_returns_set_walker(Node *node, void *context)
return false;
if (IsA(node, CoalesceExpr))
return false;
if (IsA(node, MinMaxExpr))
return false;
if (IsA(node, NullIfExpr))
return false;
@@ -847,6 +849,8 @@ contain_nonstrict_functions_walker(Node *node, void *context)
return true;
if (IsA(node, CoalesceExpr))
return true;
if (IsA(node, MinMaxExpr))
return true;
if (IsA(node, NullIfExpr))
return true;
if (IsA(node, NullTest))
@@ -1685,7 +1689,7 @@ eval_const_expressions_mutator(Node *node,
newargs = lappend(newargs, newcasewhen);
continue;
}
/*
* Found a TRUE condition, so none of the remaining alternatives
* can be reached. We treat the result as the default result.
@@ -2932,6 +2936,8 @@ expression_tree_walker(Node *node,
return walker(((RowExpr *) node)->args, context);
case T_CoalesceExpr:
return walker(((CoalesceExpr *) node)->args, context);
case T_MinMaxExpr:
return walker(((MinMaxExpr *) node)->args, context);
case T_NullIfExpr:
return walker(((NullIfExpr *) node)->args, context);
case T_NullTest:
@@ -3392,6 +3398,16 @@ expression_tree_mutator(Node *node,
return (Node *) newnode;
}
break;
case T_MinMaxExpr:
{
MinMaxExpr *minmaxexpr = (MinMaxExpr *) node;
MinMaxExpr *newnode;
FLATCOPY(newnode, minmaxexpr, MinMaxExpr);
MUTATE(newnode->args, minmaxexpr->args, List *);
return (Node *) newnode;
}
break;
case T_NullIfExpr:
{
NullIfExpr *expr = (NullIfExpr *) node;