/*
* Inserts array of item pointers, may execute several tree scan (very rare)
*/
void
ginInsertItemPointers(GinPostingTreeScan *gdi,
ItemPointerData *items, uint32 nitem,
GinStatsData *buildStats)
{
BlockNumber rootBlkno = gdi->stack->blkno;
gdi->btree.items = items;
gdi->btree.nitem = nitem;
gdi->btree.curitem = 0;
while (gdi->btree.curitem < gdi->btree.nitem)
{
if (!gdi->stack)
gdi->stack = ginPrepareFindLeafPage(&gdi->btree, rootBlkno);
gdi->stack = ginFindLeafPage(&gdi->btree, gdi->stack);
if (gdi->btree.findItem(&(gdi->btree), gdi->stack))
{
/*
* gdi->btree.items[gdi->btree.curitem] already exists in index
*/
gdi->btree.curitem++;
LockBuffer(gdi->stack->buffer, GIN_UNLOCK);
freeGinBtreeStack(gdi->stack);
}
else
ginInsertValue(&(gdi->btree), gdi->stack, buildStats);
gdi->stack = NULL;
}
}
/*
* Inserts array of item pointers, may execute several tree scan (very rare)
*/
void
insertItemPointer(GinPostingTreeScan *gdi, ItemPointerData *items, uint32 nitem)
{
BlockNumber rootBlkno = gdi->stack->blkno;
gdi->btree.items = items;
gdi->btree.nitem = nitem;
gdi->btree.curitem = 0;
while (gdi->btree.curitem < gdi->btree.nitem)
{
if (!gdi->stack)
gdi->stack = ginPrepareFindLeafPage(&gdi->btree, rootBlkno);
gdi->stack = ginFindLeafPage(&gdi->btree, gdi->stack);
if (gdi->btree.findItem(&(gdi->btree), gdi->stack))
elog(ERROR, "item pointer (%u,%d) already exists",
ItemPointerGetBlockNumber(gdi->btree.items + gdi->btree.curitem),
ItemPointerGetOffsetNumber(gdi->btree.items + gdi->btree.curitem));
ginInsertValue(&(gdi->btree), gdi->stack);
gdi->stack = NULL;
}
}
GinPostingTreeScan *
ginPrepareScanPostingTree(Relation index, BlockNumber rootBlkno, bool searchMode)
{
GinPostingTreeScan *gdi = (GinPostingTreeScan *) palloc0(sizeof(GinPostingTreeScan));
ginPrepareDataScan(&gdi->btree, index);
gdi->btree.searchMode = searchMode;
gdi->btree.fullScan = searchMode;
gdi->stack = ginPrepareFindLeafPage(&gdi->btree, rootBlkno);
return gdi;
}
/*
* Locates leaf page contained tuple
*/
GinBtreeStack *
ginFindLeafPage(GinBtree btree, GinBtreeStack *stack)
{
bool isfirst = TRUE;
BlockNumber rootBlkno;
if (!stack)
stack = ginPrepareFindLeafPage(btree, GIN_ROOT_BLKNO);
rootBlkno = stack->blkno;
for (;;)
{
Page page;
BlockNumber child;
int access = GIN_SHARE;
stack->off = InvalidOffsetNumber;
page = BufferGetPage(stack->buffer);
if (isfirst)
{
if (GinPageIsLeaf(page) && !btree->searchMode)
access = GIN_EXCLUSIVE;
isfirst = FALSE;
}
else
access = ginTraverseLock(stack->buffer, btree->searchMode);
/*
* ok, page is correctly locked, we should check to move right ..,
* root never has a right link, so small optimization
*/
while (btree->fullScan == FALSE && stack->blkno != rootBlkno &&
btree->isMoveRight(btree, page))
{
BlockNumber rightlink = GinPageGetOpaque(page)->rightlink;
if (rightlink == InvalidBlockNumber)
/* rightmost page */
break;
stack->blkno = rightlink;
LockBuffer(stack->buffer, GIN_UNLOCK);
stack->buffer = ReleaseAndReadBuffer(stack->buffer, btree->index, stack->blkno);
LockBuffer(stack->buffer, access);
page = BufferGetPage(stack->buffer);
}
if (GinPageIsLeaf(page)) /* we found, return locked page */
return stack;
/* now we have correct buffer, try to find child */
child = btree->findChildPage(btree, stack);
LockBuffer(stack->buffer, GIN_UNLOCK);
Assert(child != InvalidBlockNumber);
Assert(stack->blkno != child);
if (btree->searchMode)
{
/* in search mode we may forget path to leaf */
stack->blkno = child;
stack->buffer = ReleaseAndReadBuffer(stack->buffer, btree->index, stack->blkno);
}
else
{
GinBtreeStack *ptr = (GinBtreeStack *) palloc(sizeof(GinBtreeStack));
ptr->parent = stack;
stack = ptr;
stack->blkno = child;
stack->buffer = ReadBuffer(btree->index, stack->blkno);
stack->predictNumber = 1;
}
}
/* keep compiler happy */
return NULL;
}
