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Som improve page split in multicolumn GiST index.

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If user picksplit on n-th column generate equals
left and right unions then it calls picksplit on n+1-th
column.
This commit is contained in:
Teodor Sigaev
2006-05-29 12:50:06 +00:00
parent 0a6fde5a26
commit b32000eda4
3 changed files with 57 additions and 42 deletions
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10
src/backend/access/gist/gist.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/gist.c,v 1.137 2006/05/24 11:01:39 teodor Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.138 2006/05/29 12:50:06 teodor Exp $
*
*-------------------------------------------------------------------------
*/
@ -1033,7 +1033,13 @@ gistSplitByKey(Relation r, Page page, IndexTuple *itup, int len, GISTSTATE *gist
/*
* all keys are not-null
*/
gistUserPicksplit(r, entryvec, attno, v, itup, len, giststate);
if ( gistUserPicksplit(r, entryvec, attno, v, itup, len, giststate) && attno+1 != r->rd_att->natts )
/*
* Splitting on attno column is not optimized: unions of left and right
* page are the same, we will try to split page by
* following columns
*/
gistSplitByKey(r, page, itup, len, giststate, v, entryvec, attno+1);
}
}