/*
* Form a non-leaf entry tuple by copying the key data from the given tuple,
* which can be either a leaf or non-leaf entry tuple.
*
* Any posting list in the source tuple is not copied. The specified child
* block number is inserted into t_tid.
*/
static IndexTuple
GinFormInteriorTuple(IndexTuple itup, Page page, BlockNumber childblk)
{
IndexTuple nitup;
if (GinPageIsLeaf(page) && !GinIsPostingTree(itup))
{
/* Tuple contains a posting list, just copy stuff before that */
uint32 origsize = GinGetPostingOffset(itup);
origsize = MAXALIGN(origsize);
nitup = (IndexTuple) palloc(origsize);
memcpy(nitup, itup, origsize);
/* ... be sure to fix the size header field ... */
nitup->t_info &= ~INDEX_SIZE_MASK;
nitup->t_info |= origsize;
}
else
{
/* Copy the tuple as-is */
nitup = (IndexTuple) palloc(IndexTupleSize(itup));
memcpy(nitup, itup, IndexTupleSize(itup));
}
/* Now insert the correct downlink */
GinSetDownlink(nitup, childblk);
return nitup;
}
/*
* Delete tuple on leaf page if tuples existed and we
* should update it, update old child blkno to new right page
* if child split occurred
*/
static void
entryPreparePage(GinBtree btree, Page page, OffsetNumber off,
GinBtreeEntryInsertData *insertData, BlockNumber updateblkno)
{
Assert(insertData->entry);
Assert(!GinPageIsData(page));
if (insertData->isDelete)
{
Assert(GinPageIsLeaf(page));
PageIndexTupleDelete(page, off);
}
if (!GinPageIsLeaf(page) && updateblkno != InvalidBlockNumber)
{
IndexTuple itup = (IndexTuple) PageGetItem(page, PageGetItemId(page, off));
GinSetDownlink(itup, updateblkno);
}
}
static void
ginRedoInsertEntry(Buffer buffer, bool isLeaf, BlockNumber rightblkno, void *rdata)
{
Page page = BufferGetPage(buffer);
ginxlogInsertEntry *data = (ginxlogInsertEntry *) rdata;
OffsetNumber offset = data->offset;
IndexTuple itup;
if (rightblkno != InvalidBlockNumber)
{
/* update link to right page after split */
Assert(!GinPageIsLeaf(page));
Assert(offset >= FirstOffsetNumber && offset <= PageGetMaxOffsetNumber(page));
itup = (IndexTuple) PageGetItem(page, PageGetItemId(page, offset));
GinSetDownlink(itup, rightblkno);
}
if (data->isDelete)
{
Assert(GinPageIsLeaf(page));
Assert(offset >= FirstOffsetNumber && offset <= PageGetMaxOffsetNumber(page));
PageIndexTupleDelete(page, offset);
}
itup = &data->tuple;
if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), offset, false, false) == InvalidOffsetNumber)
{
RelFileNode node;
ForkNumber forknum;
BlockNumber blknum;
BufferGetTag(buffer, &node, &forknum, &blknum);
elog(ERROR, "failed to add item to index page in %u/%u/%u",
node.spcNode, node.dbNode, node.relNode);
}
}
