Function ExecReScanDynamicSeqScan

src/backend/executor/nodeDynamicSeqscan.c:291–313

* ExecReScanDynamicSeqScan * Prepares the internal states for a rescan. */

 *		Prepares the internal states for a rescan.
 */
void
ExecReScanDynamicSeqScan(DynamicSeqScanState *node)
{
	DynamicSeqScanEndCurrentScan(node);

	// reset partition internal state

	/*
	 * If any PARAM_EXEC Params used in pruning expressions have changed, then
	 * we'd better unset the valid subplans so that they are reselected for
	 * the new parameter values.
	 */
	if (node->as_prune_state &&
		bms_overlap(node->ss.ps.chgParam,
					node->as_prune_state->execparamids))
	{
		bms_free(node->as_valid_subplans);
		node->as_valid_subplans = NULL;
	}

	node->whichPart = -1;

}