Function ExecResetTupleTable

src/backend/executor/execTuples.c:1207–1243

-------------------------------- * ExecResetTupleTable * * This releases any resources (buffer pins, tupdesc refcounts) * held by the tuple table, and optionally releases the memory * occupied by the tuple table data structure. * It is expected that this routine be called by ExecEndPlan(). * -------------------------------- */

 * --------------------------------
 */
void
ExecResetTupleTable(List *tupleTable,	/* tuple table */
					bool shouldFree)	/* true if we should free memory */
{
	ListCell   *lc;

	foreach(lc, tupleTable)
	{
		TupleTableSlot *slot = lfirst_node(TupleTableSlot, lc);

		/* Always release resources and reset the slot to empty */
		ExecClearTuple(slot);
		slot->tts_ops->release(slot);
		if (slot->tts_tupleDescriptor)
		{
			ReleaseTupleDesc(slot->tts_tupleDescriptor);
			slot->tts_tupleDescriptor = NULL;
		}

		/* If shouldFree, release memory occupied by the slot itself */
		if (shouldFree)
		{
			if (!TTS_FIXED(slot))
			{
				if (slot->tts_values)
					pfree(slot->tts_values);
				if (slot->tts_isnull)
					pfree(slot->tts_isnull);
			}
			pfree(slot);
		}
	}

	/* If shouldFree, release the list structure */
	if (shouldFree)
		list_free(tupleTable);
}

/* --------------------------------
 *		MakeSingleTupleTableSlot