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

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

View File

@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.135 2007/04/30 00:16:43 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.136 2007/06/11 01:16:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -618,6 +618,15 @@ fix_scan_expr_mutator(Node *node, fix_scan_expr_context *context)
var->varnoold += context->rtoffset;
return (Node *) var;
}
if (IsA(node, CurrentOfExpr))
{
CurrentOfExpr *cexpr = (CurrentOfExpr *) copyObject(node);
Assert(cexpr->cvarno != INNER);
Assert(cexpr->cvarno != OUTER);
cexpr->cvarno += context->rtoffset;
return (Node *) cexpr;
}
/*
* Since we update opcode info in-place, this part could possibly
* scribble on the planner's input data structures, but it's OK.