Function extension_rumcostestimate

pg_documentdb/src/index_am/rum.c:625–642

* Custom cost estimation function for RUM. * While Function support handles matching against specific indexes * and ensuring pushdowns happen properly (see dollar_support), * There is one case that is not yet handled. * If an index has a predicate (partial index), and the *only* clauses * in the query are ones that match the predicate, indxpath.create_index_paths * creates quals that exclude

 * index for the index to be considered.
 */
static void
extension_rumcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
						  Cost *indexStartupCost, Cost *indexTotalCost,
						  Selectivity *indexSelectivity, double *indexCorrelation,
						  double *indexPages)
{
	bool enableCompositePlannerCosts = EnablePlannerCostSelectivityFromRelOptInfo(root,
																				  path->
																				  indexinfo
																				  ->rel);
	bool forceIndexPushdownCostToZero = !enableCompositePlannerCosts &&
										ForceUseIndexIfAvailable;
	extension_rumcostestimate_core(root, path, loop_count, indexStartupCost,
								   indexTotalCost,
								   indexSelectivity, indexCorrelation, indexPages,
								   &rum_index_routine, forceIndexPushdownCostToZero,
								   enableCompositePlannerCosts, RumOrderedCostEstimate);
}


void