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Support UPDATE/DELETE WHERE CURRENT OF cursor_name, per SQL standard.

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Along the way, allow FOR UPDATE in non-WITH-HOLD cursors; there may once
have been a reason to disallow that, but it seems to work now, and it's
really rather necessary if you want to select a row via a cursor and then
update it in a concurrent-safe fashion.

Original patch by Arul Shaji, rather heavily editorialized by Tom Lane.
This commit is contained in:
Tom Lane
2007-06-11 01:16:30 +00:00
parent 85d72f0516
commit 6808f1b1de
30 changed files with 940 additions and 127 deletions
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4
src/backend/optimizer/util/clauses.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.245 2007/06/05 21:31:05 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.246 2007/06/11 01:16:23 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -3407,6 +3407,7 @@ expression_tree_walker(Node *node,
case T_CoerceToDomainValue:
case T_CaseTestExpr:
case T_SetToDefault:
case T_CurrentOfExpr:
case T_RangeTblRef:
case T_OuterJoinInfo:
/* primitive node types with no expression subnodes */
@@ -3873,6 +3874,7 @@ expression_tree_mutator(Node *node,
case T_CoerceToDomainValue:
case T_CaseTestExpr:
case T_SetToDefault:
case T_CurrentOfExpr:
case T_RangeTblRef:
case T_OuterJoinInfo:
return (Node *) copyObject(node);