Function ExecStoreHeapTupleDatum

src/backend/executor/execTuples.c:1622–1639

* Store a HeapTuple in datum form, into a slot. That always requires * deforming it and storing it in virtual form. * * Until the slot is materialized, the contents of the slot depend on the * datum. */

 * datum.
 */
void
ExecStoreHeapTupleDatum(Datum data, TupleTableSlot *slot)
{
	HeapTupleData tuple = {0};
	HeapTupleHeader td;

	td = DatumGetHeapTupleHeader(data);

	tuple.t_len = HeapTupleHeaderGetDatumLength(td);
	tuple.t_self = td->t_ctid;
	tuple.t_data = td;

	ExecClearTuple(slot);

	heap_deform_tuple(&tuple, slot->tts_tupleDescriptor,
					  slot->tts_values, slot->tts_isnull);
	ExecStoreVirtualTuple(slot);
}

/*
 * ExecFetchSlotHeapTuple - fetch HeapTuple representing the slot's content