database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-06 07:49:08 +03:00
Code Activity

Second try at fixing join alias variables. Instead of attaching miscellaneous

Browse Source 
lists to join RTEs, attach a list of Vars and COALESCE expressions that will
replace the join's alias variables during planning.  This simplifies
flatten_join_alias_vars while still making it easy to fix up varno references
when transforming the query tree.  Add regression test cases for interactions
of subqueries with outer joins.
This commit is contained in:
Tom Lane
2002-04-28 19:54:29 +00:00
parent c8996f9c6b
commit 6c59886942
21 changed files with 624 additions and 653 deletions
Download Patch File Download Diff File Expand all files Collapse all files

66
src/backend/optimizer/util/clauses.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.96 2002/04/05 00:31:27 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.97 2002/04/28 19:54:28 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -1902,6 +1902,8 @@ query_tree_walker(Query *query,
void *context,
bool visitQueryRTEs)
{
List *rt;
Assert(query != NULL && IsA(query, Query));
if (walker((Node *) query->targetList, context))
@@ -1912,17 +1914,25 @@ query_tree_walker(Query *query,
return true;
if (walker(query->havingQual, context))
return true;
if (visitQueryRTEs)
foreach(rt, query->rtable)
{
List *rt;
RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt);
foreach(rt, query->rtable)
switch (rte->rtekind)
{
RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt);
if (rte->subquery)
if (walker(rte->subquery, context))
case RTE_RELATION:
case RTE_SPECIAL:
/* nothing to do */
break;
case RTE_SUBQUERY:
if (visitQueryRTEs)
if (walker(rte->subquery, context))
return true;
break;
case RTE_JOIN:
if (walker(rte->joinaliasvars, context))
return true;
break;
}
}
return false;
@@ -2281,32 +2291,42 @@ query_tree_mutator(Query *query,
void *context,
bool visitQueryRTEs)
{
List *newrt = NIL;
List *rt;
Assert(query != NULL && IsA(query, Query));
MUTATE(query->targetList, query->targetList, List *);
MUTATE(query->jointree, query->jointree, FromExpr *);
MUTATE(query->setOperations, query->setOperations, Node *);
MUTATE(query->havingQual, query->havingQual, Node *);
if (visitQueryRTEs)
foreach(rt, query->rtable)
{
List *newrt = NIL;
List *rt;
RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt);
RangeTblEntry *newrte;
foreach(rt, query->rtable)
switch (rte->rtekind)
{
RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt);
if (rte->subquery)
{
RangeTblEntry *newrte;
case RTE_RELATION:
case RTE_SPECIAL:
/* nothing to do, don't bother to make a copy */
break;
case RTE_SUBQUERY:
if (visitQueryRTEs)
{
FLATCOPY(newrte, rte, RangeTblEntry);
CHECKFLATCOPY(newrte->subquery, rte->subquery, Query);
MUTATE(newrte->subquery, newrte->subquery, Query *);
rte = newrte;
}
break;
case RTE_JOIN:
FLATCOPY(newrte, rte, RangeTblEntry);
CHECKFLATCOPY(newrte->subquery, rte->subquery, Query);
MUTATE(newrte->subquery, newrte->subquery, Query *);
MUTATE(newrte->joinaliasvars, rte->joinaliasvars, List *);
rte = newrte;
}
newrt = lappend(newrt, rte);
break;
}
query->rtable = newrt;
newrt = lappend(newrt, rte);
}
query->rtable = newrt;
}