/* ---------------------------------------------------------------- * ExecIndexOnlyScanInitializeDSM * * Set up a parallel index-only scan descriptor. * ---------------------------------------------------------------- */ void ExecIndexOnlyScanInitializeDSM(IndexOnlyScanState *node, ParallelContext *pcxt) { EState *estate = node->ss.ps.state; ParallelIndexScanDesc piscan; piscan = shm_toc_allocate(pcxt->toc, node->ioss_PscanLen); index_parallelscan_initialize(node->ss.ss_currentRelation, node->ioss_RelationDesc, estate->es_snapshot, piscan); shm_toc_insert(pcxt->toc, node->ss.ps.plan->plan_node_id, piscan); node->ioss_ScanDesc = index_beginscan_parallel(node->ss.ss_currentRelation, node->ioss_RelationDesc, node->ioss_NumScanKeys, node->ioss_NumOrderByKeys, piscan); node->ioss_ScanDesc->xs_want_itup = true; node->ioss_VMBuffer = InvalidBuffer; /* * If no run-time keys to calculate or they are ready, go ahead and pass * the scankeys to the index AM. */ if (node->ioss_NumRuntimeKeys == 0 || node->ioss_RuntimeKeysReady) index_rescan(node->ioss_ScanDesc, node->ioss_ScanKeys, node->ioss_NumScanKeys, node->ioss_OrderByKeys, node->ioss_NumOrderByKeys); }
/* ---------------------------------------------------------------- * ExecIndexOnlyScanInitializeWorker * * Copy relevant information from TOC into planstate. * ---------------------------------------------------------------- */ void ExecIndexOnlyScanInitializeWorker(IndexOnlyScanState *node, shm_toc *toc) { ParallelIndexScanDesc piscan; piscan = shm_toc_lookup(toc, node->ss.ps.plan->plan_node_id, false); node->ioss_ScanDesc = index_beginscan_parallel(node->ss.ss_currentRelation, node->ioss_RelationDesc, node->ioss_NumScanKeys, node->ioss_NumOrderByKeys, piscan); node->ioss_ScanDesc->xs_want_itup = true; /* * If no run-time keys to calculate or they are ready, go ahead and pass * the scankeys to the index AM. */ if (node->ioss_NumRuntimeKeys == 0 || node->ioss_RuntimeKeysReady) index_rescan(node->ioss_ScanDesc, node->ioss_ScanKeys, node->ioss_NumScanKeys, node->ioss_OrderByKeys, node->ioss_NumOrderByKeys); }