Function StoreIndexTuple

src/backend/executor/nodeIndexonlyscan.c:269–284

* StoreIndexTuple * Fill the slot with data from the index tuple. * * At some point this might be generally-useful functionality, but * right now we don't need it elsewhere. */

 * right now we don't need it elsewhere.
 */
static void
StoreIndexTuple(TupleTableSlot *slot, IndexTuple itup, TupleDesc itupdesc)
{
	/*
	 * Note: we must use the tupdesc supplied by the AM in index_deform_tuple,
	 * not the slot's tupdesc, in case the latter has different datatypes
	 * (this happens for btree name_ops in particular).  They'd better have
	 * the same number of columns though, as well as being datatype-compatible
	 * which is something we can't so easily check.
	 */
	Assert(slot->tts_tupleDescriptor->natts == itupdesc->natts);

	ExecClearTuple(slot);
	index_deform_tuple(itup, itupdesc, slot->tts_values, slot->tts_isnull);
	ExecStoreVirtualTuple(slot);
}

/*
 * IndexOnlyRecheck -- access method routine to recheck a tuple in EvalPlanQual