Function ExecIndexScanEstimate

src/backend/executor/nodeIndexscan.c:1674–1684

---------------------------------------------------------------- * ExecIndexScanEstimate * * Compute the amount of space we'll need in the parallel * query DSM, and inform pcxt->estimator about our needs. * ---------------------------------------------------------------- */

 * ----------------------------------------------------------------
 */
void
ExecIndexScanEstimate(IndexScanState *node,
					  ParallelContext *pcxt)
{
	EState	   *estate = node->ss.ps.state;

	node->iss_PscanLen = index_parallelscan_estimate(node->iss_RelationDesc,
													 estate->es_snapshot);
	shm_toc_estimate_chunk(&pcxt->estimator, node->iss_PscanLen);
	shm_toc_estimate_keys(&pcxt->estimator, 1);
}

/* ----------------------------------------------------------------
 *		ExecIndexScanInitializeDSM