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Fix possible duplicate tuples while GiST scan. Now page is processed

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at once and ItemPointers are collected in memory.

Remove tuple's killing by killtuple() if tuple was moved to another
page - it could produce unaceptable overhead.

Backpatch up to 8.1 because the bug was introduced by GiST's concurrency support.
This commit is contained in:
Teodor Sigaev
2008-08-23 10:37:24 +00:00
parent 42d313f546
commit 1dcf6fdf1b
3 changed files with 127 additions and 90 deletions
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14
src/backend/access/gist/gistscan.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistscan.c,v 1.70 2008/06/19 00:46:03 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistscan.c,v 1.71 2008/08/23 10:37:24 teodor Exp $
*
*-------------------------------------------------------------------------
*/
@ -63,6 +63,7 @@ gistrescan(PG_FUNCTION_ARGS)
ReleaseBuffer(so->markbuf);
so->markbuf = InvalidBuffer;
}
}
else
{
@ -83,6 +84,7 @@ gistrescan(PG_FUNCTION_ARGS)
*/
ItemPointerSetInvalid(&so->curpos);
ItemPointerSetInvalid(&so->markpos);
so->nPageData = so->curPageData = 0;
/* Update scan key, if a new one is given */
if (key && scan->numberOfKeys > 0)
@ -150,6 +152,11 @@ gistmarkpos(PG_FUNCTION_ARGS)
so->markbuf = so->curbuf;
}
so->markNPageData = so->nPageData;
so->markCurPageData = so->curPageData;
if ( so->markNPageData > 0 )
memcpy( so->markPageData, so->pageData, sizeof(ItemResult) * so->markNPageData );
PG_RETURN_VOID();
}
@ -199,6 +206,11 @@ gistrestrpos(PG_FUNCTION_ARGS)
so->curbuf = so->markbuf;
}
so->nPageData = so->markNPageData;
so->curPageData = so->markNPageData;
if ( so->markNPageData > 0 )
memcpy( so->pageData, so->markPageData, sizeof(ItemResult) * so->markNPageData );
PG_RETURN_VOID();
}