Function ExecSeqScanInitializeWorker

src/backend/executor/nodeSeqscan.c:383–407

---------------------------------------------------------------- * ExecSeqScanInitializeWorker * * Copy relevant information from TOC into planstate. * ---------------------------------------------------------------- */

 * ----------------------------------------------------------------
 */
void
ExecSeqScanInitializeWorker(SeqScanState *node,
							ParallelWorkerContext *pwcxt)
{
	ParallelTableScanDesc pscan;
	TableScanDesc scandesc;
	EState	   *estate = node->ss.ps.state;

	pscan = shm_toc_lookup(pwcxt->toc, node->ss.ps.plan->plan_node_id, false);
	if (node->ss.ss_currentRelation->rd_tableam->scan_begin_extractcolumns)
	{
		/* try parallel mode for AOCO extract columns */
		scandesc = table_beginscan_es(node->ss.ss_currentRelation,
									  estate->es_snapshot,
									  0, NULL,
									  pscan,
									  &node->ss.ps);
	}
	else
	{
		/* normal parallel mode */
		scandesc = table_beginscan_parallel(node->ss.ss_currentRelation, pscan);
	}
	node->ss.ss_currentScanDesc = scandesc;
}

/*
 * Returns true if the element may be in the bloom filter.