Function ExecDynamicIndexScan

src/backend/executor/nodeDynamicIndexscan.c:104–139

* Execution of DynamicIndexScan */

 * Execution of DynamicIndexScan
 */
TupleTableSlot *
ExecDynamicIndexScan(PlanState *pstate)
{
	DynamicIndexScanState *node = castNode(DynamicIndexScanState, pstate);

	DynamicIndexScan *plan = (DynamicIndexScan *) node->ss.ps.plan;

	node->as_valid_subplans = NULL;
	if (NULL != plan->join_prune_paramids && !node->did_pruning)
	{
		node->did_pruning = true;
		node->as_valid_subplans =
			ExecFindMatchingSubPlans(node->as_prune_state,
									 node->ss.ps.state,
									 list_length(plan->partOids),
									 plan->join_prune_paramids);

		int			i;
		int			partOidIdx = -1;
		List	   *newPartOids = NIL;
		ListCell   *lc;

		for (i = 0; i < bms_num_members(node->as_valid_subplans); i++)
		{
			partOidIdx = bms_next_member(node->as_valid_subplans, partOidIdx);
			newPartOids = lappend_oid(newPartOids, node->partOids[partOidIdx]);
		}

		node->partOids = palloc(sizeof(Oid) * list_length(newPartOids));
		foreach_with_count(lc, newPartOids, i)
			node->partOids[i] = lfirst_oid(lc);
		node->nOids = list_length(newPartOids);
	}

	return ExecNextDynamicIndexScan(node);
}