Function ExecNextDynamicIndexScan

src/backend/executor/execDynamicIndexes.c:258–292

}

TupleTableSlot *
ExecNextDynamicIndexScan(DynamicIndexScanState *node)
{
	TupleTableSlot *slot = NULL;

	/*
	 * Scan index to find next tuple to return. If the current index is
	 * exhausted, close it and open the next index for scan.
	 */
	for (;;)
	{
		if (!initNextIndexToScan(node))
			return NULL;

		Assert((node->indexScanState == NULL && node->indexOnlyScanState != NULL) ||
			   (node->indexScanState != NULL && node->indexOnlyScanState == NULL));

		if (node->indexScanState)
			slot = ExecProcNode(&node->indexScanState->ss.ps);
		else if (node->indexOnlyScanState)
			slot = ExecProcNode(&node->indexOnlyScanState->ss.ps);
		else
			return NULL;

		if (TupIsNull(slot))
		{
			endCurrentIndexScan(node);

			node->scan_state = SCAN_INIT;
		}
		else
			break;
	}
	return slot;
}

/*
 * Release resources of DynamicIndexScan