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Fix bug in compressed GIN data leaf page splitting code.

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The list of posting lists it's dealing with can contain placeholders for
deleted posting lists. The placeholders are kept around so that they can
be WAL-logged, but we must be careful to not try to access them.

This fixes bug #11280, reported by Mårten Svantesson. Backpatch to 9.4,
where the compressed data leaf page code was added.
This commit is contained in:
Heikki Linnakangas 2014-08-29 14:19:34 +03:00
parent c573e9d776
commit 08bff295a7
1 changed files with 16 additions and 12 deletions
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28
src/backend/access/gin/gindatapage.c
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@ -642,20 +642,24 @@ dataPlaceToPageLeaf(GinBtree btree, Buffer buf, GinBtreeStack *stack,
{
lastleftinfo = dlist_container(leafSegmentInfo, node, leaf->lastleft);
segsize = SizeOfGinPostingList(lastleftinfo->seg);
if (append)
/* ignore deleted segments */
if (lastleftinfo->action != GIN_SEGMENT_DELETE)
{
if ((leaf->lsize - segsize) - (leaf->lsize - segsize) < BLCKSZ / 4)
break;
}
else
{
if ((leaf->lsize - segsize) - (leaf->rsize + segsize) < 0)
break;
}
segsize = SizeOfGinPostingList(lastleftinfo->seg);
if (append)
{
if ((leaf->lsize - segsize) - (leaf->lsize - segsize) < BLCKSZ / 4)
break;
}
else
{
if ((leaf->lsize - segsize) - (leaf->rsize + segsize) < 0)
break;
}
leaf->lsize -= segsize;
leaf->rsize += segsize;
leaf->lsize -= segsize;
leaf->rsize += segsize;
}
leaf->lastleft = dlist_prev_node(&leaf->segments, leaf->lastleft);
}
}