示例#1
0
/*
 * Build a fresh leaf tuple, either posting-list or posting-tree format
 * depending on whether the given items list will fit.
 * items[] must be in sorted order with no duplicates.
 *
 * This is basically the same logic as in addItemPointersToLeafTuple,
 * but working from slightly different input.
 */
static IndexTuple
buildFreshLeafTuple(GinState *ginstate,
					OffsetNumber attnum, Datum key, GinNullCategory category,
					ItemPointerData *items, uint32 nitem,
					GinStatsData *buildStats)
{
	IndexTuple	res;

	/* try to build a posting list tuple with all the items */
	res = GinFormTuple(ginstate, attnum, key, category,
					   items, nitem, false);

	if (!res)
	{
		/* posting list would be too big, build posting tree */
		BlockNumber postingRoot;

		/*
		 * Build posting-tree-only result tuple.  We do this first so as to
		 * fail quickly if the key is too big.
		 */
		res = GinFormTuple(ginstate, attnum, key, category, NULL, 0, true);

		/*
		 * Initialize a new posting tree with the TIDs.
		 */
		postingRoot = createPostingTree(ginstate->index, items, nitem,
										buildStats);

		/* And save the root link in the result tuple */
		GinSetPostingTree(res, postingRoot);
	}

	return res;
}
示例#2
0
/*
 * Adds array of item pointers to tuple's posting list or
 * creates posting tree and tuple pointed to tree in a case
 * of not enough space.  Max size of tuple is defined in
 * GinFormTuple().
 */
static IndexTuple
addItemPointersToTuple(Relation index, GinState *ginstate,
					   GinBtreeStack *stack, IndexTuple old,
					   ItemPointerData *items, uint32 nitem,
					   GinStatsData *buildStats)
{
	Datum		key = gin_index_getattr(ginstate, old);
	OffsetNumber attnum = gintuple_get_attrnum(ginstate, old);
	IndexTuple	res = GinFormTuple(index, ginstate, attnum, key,
								   NULL, nitem + GinGetNPosting(old),
								   false);

	if (res)
	{
		/* good, small enough */
		uint32		newnitem;

		newnitem = ginMergeItemPointers(GinGetPosting(res),
										GinGetPosting(old),
										GinGetNPosting(old),
										items, nitem);
		/* merge might have eliminated some duplicate items */
		GinShortenTuple(res, newnitem);
	}
	else
	{
		BlockNumber postingRoot;
		GinPostingTreeScan *gdi;

		/* posting list becomes big, so we need to make posting's tree */
		res = GinFormTuple(index, ginstate, attnum, key, NULL, 0, true);
		postingRoot = createPostingTree(index, GinGetPosting(old), GinGetNPosting(old));
		GinSetPostingTree(res, postingRoot);

		gdi = ginPrepareScanPostingTree(index, postingRoot, FALSE);
		gdi->btree.isBuild = (buildStats != NULL);

		ginInsertItemPointer(gdi, items, nitem, buildStats);

		pfree(gdi);

		/* During index build, count the newly-added data page */
		if (buildStats)
			buildStats->nDataPages++;
	}

	return res;
}
示例#3
0
/*
 * Adds array of item pointers to tuple's posting list or
 * creates posting tree and tuple pointed to tree in a case
 * of not enough space.  Max size of tuple is defined in
 * GinFormTuple().
 */
static IndexTuple
addItemPointersToTuple(Relation index, GinState *ginstate, GinBtreeStack *stack,
		  IndexTuple old, ItemPointerData *items, uint32 nitem, bool isBuild)
{
	bool		isnull;
	Datum		key = index_getattr(old, FirstOffsetNumber, ginstate->tupdesc, &isnull);
	IndexTuple	res = GinFormTuple(ginstate, key, NULL, nitem + GinGetNPosting(old));

	if (res)
	{
		/* good, small enough */
		MergeItemPointers(GinGetPosting(res),
						  GinGetPosting(old), GinGetNPosting(old),
						  items, nitem
			);

		GinSetNPosting(res, nitem + GinGetNPosting(old));
	}
	else
	{
		BlockNumber postingRoot;
		GinPostingTreeScan *gdi;

		/* posting list becomes big, so we need to make posting's tree */
		res = GinFormTuple(ginstate, key, NULL, 0);
		postingRoot = createPostingTree(index, GinGetPosting(old), GinGetNPosting(old));
		GinSetPostingTree(res, postingRoot);

		gdi = prepareScanPostingTree(index, postingRoot, FALSE);
		gdi->btree.isBuild = isBuild;

		insertItemPointer(gdi, items, nitem);

		pfree(gdi);
	}

	return res;
}
示例#4
0
文件: gininsert.c 项目: Brar/postgres
/*
 * Adds array of item pointers to tuple's posting list, or
 * creates posting tree and tuple pointing to tree in case
 * of not enough space.  Max size of tuple is defined in
 * GinFormTuple().  Returns a new, modified index tuple.
 * items[] must be in sorted order with no duplicates.
 */
static IndexTuple
addItemPointersToLeafTuple(GinState *ginstate,
						   IndexTuple old,
						   ItemPointerData *items, uint32 nitem,
						   GinStatsData *buildStats, Buffer buffer)
{
	OffsetNumber attnum;
	Datum		key;
	GinNullCategory category;
	IndexTuple	res;
	ItemPointerData *newItems,
			   *oldItems;
	int			oldNPosting,
				newNPosting;
	GinPostingList *compressedList;

	Assert(!GinIsPostingTree(old));

	attnum = gintuple_get_attrnum(ginstate, old);
	key = gintuple_get_key(ginstate, old, &category);

	/* merge the old and new posting lists */
	oldItems = ginReadTuple(ginstate, attnum, old, &oldNPosting);

	newItems = ginMergeItemPointers(items, nitem,
									oldItems, oldNPosting,
									&newNPosting);

	/* Compress the posting list, and try to a build tuple with room for it */
	res = NULL;
	compressedList = ginCompressPostingList(newItems, newNPosting, GinMaxItemSize,
											NULL);
	pfree(newItems);
	if (compressedList)
	{
		res = GinFormTuple(ginstate, attnum, key, category,
						   (char *) compressedList,
						   SizeOfGinPostingList(compressedList),
						   newNPosting,
						   false);
		pfree(compressedList);
	}
	if (!res)
	{
		/* posting list would be too big, convert to posting tree */
		BlockNumber postingRoot;

		/*
		 * Initialize posting tree with the old tuple's posting list.  It's
		 * surely small enough to fit on one posting-tree page, and should
		 * already be in order with no duplicates.
		 */
		postingRoot = createPostingTree(ginstate->index,
										oldItems,
										oldNPosting,
										buildStats,
										buffer);

		/* Now insert the TIDs-to-be-added into the posting tree */
		ginInsertItemPointers(ginstate->index, postingRoot,
							  items, nitem,
							  buildStats);

		/* And build a new posting-tree-only result tuple */
		res = GinFormTuple(ginstate, attnum, key, category, NULL, 0, 0, true);
		GinSetPostingTree(res, postingRoot);
	}
	pfree(oldItems);

	return res;
}
示例#5
0
/*
 * Adds array of item pointers to tuple's posting list, or
 * creates posting tree and tuple pointing to tree in case
 * of not enough space.  Max size of tuple is defined in
 * GinFormTuple().	Returns a new, modified index tuple.
 * items[] must be in sorted order with no duplicates.
 */
static IndexTuple
addItemPointersToLeafTuple(GinState *ginstate,
						   IndexTuple old,
						   ItemPointerData *items, uint32 nitem,
						   GinStatsData *buildStats)
{
	OffsetNumber attnum;
	Datum		key;
	GinNullCategory category;
	IndexTuple	res;

	Assert(!GinIsPostingTree(old));

	attnum = gintuple_get_attrnum(ginstate, old);
	key = gintuple_get_key(ginstate, old, &category);

	/* try to build tuple with room for all the items */
	res = GinFormTuple(ginstate, attnum, key, category,
					   NULL, nitem + GinGetNPosting(old),
					   false);

	if (res)
	{
		/* good, small enough */
		uint32		newnitem;

		/* fill in the posting list with union of old and new TIDs */
		newnitem = ginMergeItemPointers(GinGetPosting(res),
										GinGetPosting(old),
										GinGetNPosting(old),
										items, nitem);
		/* merge might have eliminated some duplicate items */
		GinShortenTuple(res, newnitem);
	}
	else
	{
		/* posting list would be too big, convert to posting tree */
		BlockNumber postingRoot;

		/*
		 * Initialize posting tree with the old tuple's posting list.  It's
		 * surely small enough to fit on one posting-tree page, and should
		 * already be in order with no duplicates.
		 */
		postingRoot = createPostingTree(ginstate->index,
										GinGetPosting(old),
										GinGetNPosting(old),
										buildStats);

		/* Now insert the TIDs-to-be-added into the posting tree */
		ginInsertItemPointers(ginstate->index, postingRoot,
							  items, nitem,
							  buildStats);

		/* And build a new posting-tree-only result tuple */
		res = GinFormTuple(ginstate, attnum, key, category, NULL, 0, true);
		GinSetPostingTree(res, postingRoot);
	}

	return res;
}