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| author | Bruce Momjian <bruce@momjian.us> | 1998-07-15 22:16:21 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 1998-07-15 22:16:21 +0000 |
| commit | c1f1a2e03a78d52dc8e177d15e5822a0e8fbea4a (patch) | |
| tree | 8ce7498698f01dfad25782cf70ab3bc5d6be2377 /src/backend/executor/nodeAppend.c | |
| parent | 2077ce123b7ff86d047ced2849c0e44472d231ad (diff) | |
| download | postgresql-c1f1a2e03a78d52dc8e177d15e5822a0e8fbea4a.tar.gz postgresql-c1f1a2e03a78d52dc8e177d15e5822a0e8fbea4a.zip | |
Allow UNION/UNION ALL in subselects.
Diffstat (limited to 'src/backend/executor/nodeAppend.c')
| -rw-r--r-- | src/backend/executor/nodeAppend.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c index a1c21e88939..aea18739344 100644 --- a/src/backend/executor/nodeAppend.c +++ b/src/backend/executor/nodeAppend.c @@ -7,7 +7,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/executor/nodeAppend.c,v 1.13 1998/07/15 14:54:30 momjian Exp $ + * $Header: /cvsroot/pgsql/src/backend/executor/nodeAppend.c,v 1.14 1998/07/15 22:16:18 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -15,6 +15,7 @@ * ExecInitAppend - initialize the append node * ExecProcAppend - retrieve the next tuple from the node * ExecEndAppend - shut down the append node + * ExecReScanAppend - rescan the append node * * NOTES * Each append node contains a list of one or more subplans which @@ -34,7 +35,7 @@ * nil nil ... ... ... * subplans * - * Append nodes are currently used to unions, and to support inheritance + * Append nodes are currently used for 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 @@ -500,3 +501,25 @@ ExecEndAppend(Append *node) * appendstate->as_junkfilter_list here */ } +void +ExecReScanAppend(Append *node, ExprContext *exprCtxt, Plan *parent) +{ + AppendState *appendstate = node->appendstate; + int nplans = length(node->appendplans); + int i; + + for (i = 0; i < nplans; i++) + { + Plan *rescanNode; + + appendstate->as_whichplan = i; + rescanNode = (Plan *) nth(i, node->appendplans); + if (rescanNode->chgParam == NULL) + { + exec_append_initialize_next(node); + ExecReScan((Plan *)rescanNode, exprCtxt, (Plan *) node); + } + } + appendstate->as_whichplan = 0; + exec_append_initialize_next(node); +} |