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ExecReScan for Unique & Sort nodes.

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This commit is contained in:
Vadim B. Mikheev
1998-02-23 06:28:16 +00:00
parent e4fd534645
commit f0e7e2faa4
7 changed files with 83 additions and 11 deletions
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27
src/backend/utils/sort/psort.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/sort/Attic/psort.c,v 1.37 1998/02/11 19:13:47 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/sort/Attic/psort.c,v 1.38 1998/02/23 06:27:39 vadim Exp $
*
* NOTES
* Sorts the first relation into the second relation.
@ -924,8 +924,6 @@ psort_end(Sort * node)
if (!node->cleaned)
{
Assert(node != (Sort *) NULL);
/*
* I'm changing this because if we are sorting a relation with no
* tuples, psortstate is NULL.
@ -944,12 +942,35 @@ psort_end(Sort * node)
(int) ceil((double) PS(node)->BytesWritten / BLCKSZ);
pfree((void *) node->psortstate);
node->psortstate = NULL;
node->cleaned = TRUE;
}
}
}
void
psort_rescan (Sort *node)
{
/*
* If subnode is to be rescanned then free our previous results
*/
if (((Plan*) node)->lefttree->chgParam != NULL)
{
psort_end (node);
node->cleaned = false;
}
else if (PS(node) != (Psortstate *) NULL)
{
PS(node)->all_fetched = false;
PS(node)->psort_current = 0;
PS(node)->psort_saved = 0;
if (PS(node)->using_tape_files == true)
rewind (PS(node)->psort_grab_file);
}
}
/*
* gettape - handles access temporary files in polyphase merging
*