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UNION work for UNION ALL and other union stuff.

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This commit is contained in:
Bruce Momjian
1997-12-27 06:41:41 +00:00
parent 2730c4a45c
commit 4ce24c8aa9
8 changed files with 178 additions and 84 deletions
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42
src/backend/executor/nodeAppend.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeAppend.c,v 1.9 1997/09/08 21:43:10 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeAppend.c,v 1.10 1997/12/27 06:40:50 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -34,7 +34,7 @@
* nil nil ... ... ...
* subplans
*
* Append nodes are currently used to support inheritance
* Append nodes are currently used to unions, and to support inheritance
* queries, where several relations need to be scanned.
* For example, in our standard person/student/employee/student-emp
* example, where student and employee inherit from person
@ -85,6 +85,7 @@ exec_append_initialize_next(Append *node)
int whichplan;
int nplans;
List *rts;
List *rtentries;
ResTarget *rtentry;
@ -101,6 +102,7 @@ exec_append_initialize_next(Append *node)
whichplan = unionstate->as_whichplan;
nplans = unionstate->as_nplans;
rts = node->unionrts;
rtentries = node->unionrtentries;
if (whichplan < 0)
@ -140,27 +142,28 @@ exec_append_initialize_next(Append *node)
if (node->unionrelid > 0)
{
rtentry = nth(whichplan, rtentries);
if (rtentry == NULL)
elog(DEBUG, "exec_append_initialize_next: rtentry is nil");
Assert(rtentry != NULL);
unionrelid = node->unionrelid;
rt_store(unionrelid, rangeTable, rtentry);
if (unionstate->as_junkFilter_list)
{
estate->es_junkFilter =
(JunkFilter *) nth(whichplan,
unionstate->as_junkFilter_list);
}
if (unionstate->as_result_relation_info_list)
{
estate->es_result_relation_info =
(RelationInfo *) nth(whichplan,
unionstate->as_result_relation_info_list);
}
result_slot->ttc_whichplan = whichplan;
}
else
estate->es_range_table = nth(whichplan, rts);
if (unionstate->as_junkFilter_list)
{
estate->es_junkFilter =
(JunkFilter *) nth(whichplan,
unionstate->as_junkFilter_list);
}
if (unionstate->as_result_relation_info_list)
{
estate->es_result_relation_info =
(RelationInfo *) nth(whichplan,
unionstate->as_result_relation_info_list);
}
result_slot->ttc_whichplan = whichplan;
return TRUE;
}
@ -439,8 +442,7 @@ ExecProcAppend(Append *node)
if (exec_append_initialize_next(node))
{
ExecSetSlotDescriptorIsNew(result_slot, true);
return
ExecProcAppend(node);
return ExecProcAppend(node);
}
else
return ExecClearTuple(result_slot);