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Add support for the CASE statement in the rewrite handling.

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Allows (at least some) rules and views.
Still some trouble (crashes) with target CASE columns spanning tables,
 but lots now works.
This commit is contained in:
Thomas G. Lockhart
1998-12-14 00:02:17 +00:00
parent 2b189aa953
commit 4140c2f30e
6 changed files with 250 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

94
src/backend/rewrite/rewriteHandler.c
View File

@ -6,7 +6,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.26 1998/12/04 15:34:36 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.27 1998/12/14 00:02:16 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@ -1457,6 +1457,34 @@ apply_RIR_adjust_sublevel(Node *node, int sublevels_up)
}
break;
case T_CaseExpr:
{
CaseExpr *exp = (CaseExpr *)node;
apply_RIR_adjust_sublevel(
(Node *)(exp->args),
sublevels_up);
apply_RIR_adjust_sublevel(
(Node *)(exp->defresult),
sublevels_up);
}
break;
case T_CaseWhen:
{
CaseWhen *exp = (CaseWhen *)node;
apply_RIR_adjust_sublevel(
(Node *)(exp->expr),
sublevels_up);
apply_RIR_adjust_sublevel(
(Node *)(exp->result),
sublevels_up);
}
break;
default:
elog(NOTICE, "unknown node tag %d in attribute_used()", nodeTag(node));
elog(NOTICE, "Node is: %s", nodeToString(node));
@ -1691,6 +1719,50 @@ apply_RIR_view(Node **nodePtr, int rt_index, RangeTblEntry *rte, List *tlist, in
}
break;
case T_CaseExpr:
{
CaseExpr *exp = (CaseExpr *)node;
apply_RIR_view(
(Node **)(&(exp->args)),
rt_index,
rte,
tlist,
modified,
sublevels_up);
apply_RIR_view(
(Node **)(&(exp->defresult)),
rt_index,
rte,
tlist,
modified,
sublevels_up);
}
break;
case T_CaseWhen:
{
CaseWhen *exp = (CaseWhen *)node;
apply_RIR_view(
(Node **)(&(exp->expr)),
rt_index,
rte,
tlist,
modified,
sublevels_up);
apply_RIR_view(
(Node **)(&(exp->result)),
rt_index,
rte,
tlist,
modified,
sublevels_up);
}
break;
default:
elog(NOTICE, "unknown node tag %d in apply_RIR_view()", nodeTag(node));
elog(NOTICE, "Node is: %s", nodeToString(node));
@ -1885,7 +1957,27 @@ fireRIRonSubselect(Node *node)
break;
case T_CaseExpr:
{
CaseExpr *exp = (CaseExpr *)node;
fireRIRonSubselect(
(Node *)(exp->args));
fireRIRonSubselect(
(Node *)(exp->defresult));
}
break;
case T_CaseWhen:
{
CaseWhen *exp = (CaseWhen *)node;
fireRIRonSubselect(
(Node *)(exp->expr));
fireRIRonSubselect(
(Node *)(exp->result));
}
break;
case T_Query:

70
src/backend/rewrite/rewriteManip.c
View File

@ -6,7 +6,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteManip.c,v 1.22 1998/10/21 16:21:26 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteManip.c,v 1.23 1998/12/14 00:02:17 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@ -191,6 +191,38 @@ OffsetVarNodes(Node *node, int offset, int sublevels_up)
}
break;
case T_CaseExpr:
{
CaseExpr *exp = (CaseExpr *)node;
OffsetVarNodes(
(Node *)(exp->args),
offset,
sublevels_up);
OffsetVarNodes(
(Node *)(exp->defresult),
offset,
sublevels_up);
}
break;
case T_CaseWhen:
{
CaseWhen *exp = (CaseWhen *)node;
OffsetVarNodes(
(Node *)(exp->expr),
offset,
sublevels_up);
OffsetVarNodes(
(Node *)(exp->result),
offset,
sublevels_up);
}
break;
default:
elog(NOTICE, "unknown node tag %d in OffsetVarNodes()", nodeTag(node));
elog(NOTICE, "Node is: %s", nodeToString(node));
@ -377,6 +409,42 @@ ChangeVarNodes(Node *node, int rt_index, int new_index, int sublevels_up)
}
break;
case T_CaseExpr:
{
CaseExpr *exp = (CaseExpr *)node;
ChangeVarNodes(
(Node *)(exp->args),
rt_index,
new_index,
sublevels_up);
ChangeVarNodes(
(Node *)(exp->defresult),
rt_index,
new_index,
sublevels_up);
}
break;
case T_CaseWhen:
{
CaseWhen *exp = (CaseWhen *)node;
ChangeVarNodes(
(Node *)(exp->expr),
rt_index,
new_index,
sublevels_up);
ChangeVarNodes(
(Node *)(exp->result),
rt_index,
new_index,
sublevels_up);
}
break;
default:
elog(NOTICE, "unknown node tag %d in ChangeVarNodes()", nodeTag(node));
elog(NOTICE, "Node is: %s", nodeToString(node));

14
src/backend/rewrite/rewriteRemove.c
View File

@ -7,11 +7,13 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteRemove.c,v 1.19 1998/11/27 19:52:17 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteRemove.c,v 1.20 1998/12/14 00:02:17 thomas Exp $
*
*-------------------------------------------------------------------------
*/
#include <string.h>
#include "postgres.h"
#include "fmgr.h" /* for F_NAMEEQ */
@ -39,14 +41,14 @@ RewriteGetRuleEventRel(char *rulename)
PointerGetDatum(rulename),
0, 0, 0);
if (!HeapTupleIsValid(htup))
elog(ERROR, "RewriteGetRuleEventRel: rule \"%s\" not found",
rulename);
elog(ERROR, "Rule or view '%s' not found",
((!strncmp(rulename, "_RET", 4))? (rulename+4): rulename));
eventrel = ((Form_pg_rewrite) GETSTRUCT(htup))->ev_class;
htup = SearchSysCacheTuple(RELOID,
PointerGetDatum(eventrel),
0, 0, 0);
if (!HeapTupleIsValid(htup))
elog(ERROR, "RewriteGetRuleEventRel: class %d not found",
elog(ERROR, "Class '%d' not found",
eventrel);
return ((Form_pg_class) GETSTRUCT(htup))->relname.data;
}
@ -94,7 +96,7 @@ RemoveRewriteRule(char *ruleName)
if (!HeapTupleIsValid(tuple))
{
heap_close(RewriteRelation);
elog(ERROR, "No rule with name = '%s' was found.\n", ruleName);
elog(ERROR, "Rule '%s' not found\n", ruleName);
}
/*
@ -110,7 +112,7 @@ RemoveRewriteRule(char *ruleName)
{
/* XXX strange!!! */
pfree(tuple);
elog(ERROR, "RemoveRewriteRule: null event target relation!");
elog(ERROR, "RemoveRewriteRule: internal error; null event target relation!");
}
eventRelationOid = DatumGetObjectId(eventRelationOidDatum);