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Refactor the internal GIN B-tree interface for forming a downlink.

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This creates a new gin-btree callback function for creating a downlink for
a page. Previously, ginxlog.c duplicated the logic used during normal
operation.
This commit is contained in:
Heikki Linnakangas
2013-11-20 16:57:41 +02:00
parent 04965ad40e
commit 501012631e
5 changed files with 38 additions and 40 deletions
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17
src/backend/access/gin/gindatapage.c
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@@ -580,12 +580,20 @@ dataSplitPage(GinBtree btree, Buffer lbuf, Buffer rbuf, OffsetNumber off, XLogRe
rdata[1].len = MAXALIGN(maxoff * sizeofitem);
rdata[1].next = NULL;
/* Prepare a downlink tuple for insertion to the parent */
return lpage;
}
/*
* Prepare the state in 'btree' for inserting a downlink for given buffer.
*/
static void
dataPrepareDownlink(GinBtree btree, Buffer lbuf)
{
Page lpage = BufferGetPage(lbuf);
PostingItemSetBlockNumber(&(btree->pitem), BufferGetBlockNumber(lbuf));
btree->pitem.key = *GinDataPageGetRightBound(lpage);
btree->rightblkno = BufferGetBlockNumber(rbuf);
return lpage;
btree->rightblkno = GinPageGetOpaque(lpage)->rightlink;
}
/*
@@ -704,6 +712,7 @@ ginPrepareDataScan(GinBtree btree, Relation index)
btree->placeToPage = dataPlaceToPage;
btree->splitPage = dataSplitPage;
btree->fillRoot = ginDataFillRoot;
btree->prepareDownlink = dataPrepareDownlink;
btree->isData = TRUE;
btree->isDelete = FALSE;