/*
* Collect data from a pending-list page in preparation for insertion into
* the main index.
*
* Go through all tuples >= startoff on page and collect values in accum
*
* Note that ka is just workspace --- it does not carry any state across
* calls.
*/
static void
processPendingPage(BuildAccumulator *accum, KeyArray *ka,
Page page, OffsetNumber startoff)
{
ItemPointerData heapptr;
OffsetNumber i,
maxoff;
OffsetNumber attrnum;
/* reset *ka to empty */
ka->nvalues = 0;
maxoff = PageGetMaxOffsetNumber(page);
Assert(maxoff >= FirstOffsetNumber);
ItemPointerSetInvalid(&heapptr);
attrnum = 0;
for (i = startoff; i <= maxoff; i = OffsetNumberNext(i))
{
IndexTuple itup = (IndexTuple) PageGetItem(page, PageGetItemId(page, i));
OffsetNumber curattnum;
Datum curkey;
GinNullCategory curcategory;
/* Check for change of heap TID or attnum */
curattnum = gintuple_get_attrnum(accum->ginstate, itup);
if (!ItemPointerIsValid(&heapptr))
{
heapptr = itup->t_tid;
attrnum = curattnum;
}
else if (!(ItemPointerEquals(&heapptr, &itup->t_tid) &&
curattnum == attrnum))
{
/*
* ginInsertBAEntries can insert several datums per call, but only
* for one heap tuple and one column. So call it at a boundary,
* and reset ka.
*/
ginInsertBAEntries(accum, &heapptr, attrnum,
ka->keys, ka->categories, ka->nvalues);
ka->nvalues = 0;
heapptr = itup->t_tid;
attrnum = curattnum;
}
/* Add key to KeyArray */
curkey = gintuple_get_key(accum->ginstate, itup, &curcategory);
addDatum(ka, curkey, curcategory);
}
/* Dump out all remaining keys */
ginInsertBAEntries(accum, &heapptr, attrnum,
ka->keys, ka->categories, ka->nvalues);
}
/*
* Extract index entries for a single indexable item, and add them to the
* BuildAccumulator's state.
*
* This function is used only during initial index creation.
*/
static void
ginHeapTupleBulkInsert(GinBuildState *buildstate, OffsetNumber attnum,
Datum value, bool isNull,
ItemPointer heapptr)
{
Datum *entries;
GinNullCategory *categories;
int32 nentries;
MemoryContext oldCtx;
oldCtx = MemoryContextSwitchTo(buildstate->funcCtx);
entries = ginExtractEntries(buildstate->accum.ginstate, attnum,
value, isNull,
&nentries, &categories);
MemoryContextSwitchTo(oldCtx);
ginInsertBAEntries(&buildstate->accum, heapptr, attnum,
entries, categories, nentries);
buildstate->indtuples += nentries;
MemoryContextReset(buildstate->funcCtx);
}