/* ------------------------------------------------------------------ * ExecShareInputScan * Retrieve a tuple from the ShareInputScan * ------------------------------------------------------------------ */ TupleTableSlot * ExecShareInputScan(ShareInputScanState *node) { EState *estate; ScanDirection dir; bool forward; TupleTableSlot *slot; ShareInputScan * sisc = (ShareInputScan *) node->ss.ps.plan; ShareType share_type = sisc->share_type; /* * get state info from node */ estate = node->ss.ps.state; dir = estate->es_direction; forward = ScanDirectionIsForward(dir); /* if first time call, need to initialize the tuplestore state. */ if(node->ts_state == NULL) { elog(DEBUG1, "SISC (shareid=%d, slice=%d): No tuplestore yet, initializing tuplestore", sisc->share_id, currentSliceId); init_tuplestore_state(node); } slot = node->ss.ps.ps_ResultTupleSlot; while(1) { bool gotOK = false; if(share_type == SHARE_MATERIAL || share_type == SHARE_MATERIAL_XSLICE) { ntuplestore_acc_advance((NTupleStoreAccessor *) node->ts_pos, forward ? 1 : -1); gotOK = ntuplestore_acc_current_tupleslot((NTupleStoreAccessor *) node->ts_pos, slot); } else { gotOK = tuplesort_gettupleslot_pos(node->ts_state->sortstore, (TuplesortPos *)node->ts_pos, forward, slot, CurrentMemoryContext); } if(!gotOK) return NULL; SIMPLE_FAULT_INJECTOR(ExecShareInputNext); return slot; } Assert(!"should not be here"); return NULL; }
/* ---------------------------------------------------------------- * ExecMaterial * * As long as we are at the end of the data collected in the tuplestore, * we collect one new row from the subplan on each call, and stash it * aside in the tuplestore before returning it. The tuplestore is * only read if we are asked to scan backwards, rescan, or mark/restore. * * ---------------------------------------------------------------- */ TupleTableSlot * /* result tuple from subplan */ ExecMaterial(MaterialState *node) { EState *estate; ScanDirection dir; bool forward; NTupleStore *ts; NTupleStoreAccessor *tsa; bool eof_tuplestore; TupleTableSlot *slot; Material *ma; /* * get state info from node */ estate = node->ss.ps.state; dir = estate->es_direction; forward = ScanDirectionIsForward(dir); ts = node->ts_state->matstore; tsa = (NTupleStoreAccessor *) node->ts_pos; ma = (Material *) node->ss.ps.plan; Assert(IsA(ma, Material)); /* * If first time through, and we need a tuplestore, initialize it. */ if (ts == NULL && (ma->share_type != SHARE_NOTSHARED || node->randomAccess)) { /* * For cross slice material, we only run ExecMaterial on DriverSlice */ if(ma->share_type == SHARE_MATERIAL_XSLICE) { char rwfile_prefix[100]; if(ma->driver_slice != currentSliceId) { elog(LOG, "Material Exec on CrossSlice, current slice %d", currentSliceId); return NULL; } shareinput_create_bufname_prefix(rwfile_prefix, sizeof(rwfile_prefix), ma->share_id); elog(LOG, "Material node creates shareinput rwfile %s", rwfile_prefix); ts = ntuplestore_create_readerwriter(rwfile_prefix, PlanStateOperatorMemKB((PlanState *)node) * 1024, true); tsa = ntuplestore_create_accessor(ts, true); } else { /* Non-shared Materialize node */ bool isWriter = true; workfile_set *work_set = NULL; if (gp_workfile_caching) { work_set = workfile_mgr_find_set( &node->ss.ps); if (NULL != work_set) { /* Reusing cached workfiles. Tell subplan we won't be needing any tuples */ elog(gp_workfile_caching_loglevel, "Materialize reusing cached workfiles, initiating Squelch walker"); isWriter = false; ExecSquelchNode(outerPlanState(node)); node->eof_underlying = true; node->cached_workfiles_found = true; if (node->ss.ps.instrument) { node->ss.ps.instrument->workfileReused = true; } } } if (NULL == work_set) { /* * No work_set found, this is because: * a. workfile caching is enabled but we didn't find any reusable set * b. workfile caching is disabled * Creating new empty workset */ Assert(!node->cached_workfiles_found); /* Don't try to cache when running under a ShareInputScan node */ bool can_reuse = (ma->share_type == SHARE_NOTSHARED); work_set = workfile_mgr_create_set(BUFFILE, can_reuse, &node->ss.ps, NULL_SNAPSHOT); isWriter = true; } Assert(NULL != work_set); AssertEquivalent(node->cached_workfiles_found, !isWriter); ts = ntuplestore_create_workset(work_set, node->cached_workfiles_found, PlanStateOperatorMemKB((PlanState *) node) * 1024); tsa = ntuplestore_create_accessor(ts, isWriter); } Assert(ts && tsa); node->ts_state->matstore = ts; node->ts_pos = (void *) tsa; /* CDB: Offer extra info for EXPLAIN ANALYZE. */ if (node->ss.ps.instrument) { /* Let the tuplestore share our Instrumentation object. */ ntuplestore_setinstrument(ts, node->ss.ps.instrument); /* Request a callback at end of query. */ node->ss.ps.cdbexplainfun = ExecMaterialExplainEnd; } /* * MPP: If requested, fetch all rows from subplan and put them * in the tuplestore. This decouples a middle slice's receiving * and sending Motion operators to neutralize a deadlock hazard. * MPP TODO: Remove when a better solution is implemented. * * ShareInput: if the material node * is used to share input, we will need to fetch all rows and put * them in tuple store */ while (((Material *) node->ss.ps.plan)->cdb_strict || ma->share_type != SHARE_NOTSHARED) { /* * When reusing cached workfiles, we already have all the tuples, * and we don't need to read anything from subplan. */ if (node->cached_workfiles_found) { break; } TupleTableSlot *outerslot = ExecProcNode(outerPlanState(node)); if (TupIsNull(outerslot)) { node->eof_underlying = true; if (ntuplestore_created_reusable_workfiles(ts)) { ntuplestore_flush(ts); ntuplestore_mark_workset_complete(ts); } ntuplestore_acc_seek_bof(tsa); break; } Gpmon_M_Incr(GpmonPktFromMaterialState(node), GPMON_QEXEC_M_ROWSIN); ntuplestore_acc_put_tupleslot(tsa, outerslot); } CheckSendPlanStateGpmonPkt(&node->ss.ps); if(forward) ntuplestore_acc_seek_bof(tsa); else ntuplestore_acc_seek_eof(tsa); /* for share input, material do not need to return any tuple */ if(ma->share_type != SHARE_NOTSHARED) { Assert(ma->share_type == SHARE_MATERIAL || ma->share_type == SHARE_MATERIAL_XSLICE); /* * if the material is shared across slice, notify consumers that * it is ready. */ if(ma->share_type == SHARE_MATERIAL_XSLICE) { if (ma->driver_slice == currentSliceId) { ntuplestore_flush(ts); node->share_lk_ctxt = shareinput_writer_notifyready(ma->share_id, ma->nsharer_xslice, estate->es_plannedstmt->planGen); } } return NULL; } } if(ma->share_type != SHARE_NOTSHARED) return NULL; /* * If we can fetch another tuple from the tuplestore, return it. */ slot = node->ss.ps.ps_ResultTupleSlot; if(forward) eof_tuplestore = (tsa == NULL) || !ntuplestore_acc_advance(tsa, 1); else eof_tuplestore = (tsa == NULL) || !ntuplestore_acc_advance(tsa, -1); if(tsa!=NULL && ntuplestore_acc_tell(tsa, NULL)) { ntuplestore_acc_current_tupleslot(tsa, slot); if (!TupIsNull(slot)) { Gpmon_M_Incr_Rows_Out(GpmonPktFromMaterialState(node)); CheckSendPlanStateGpmonPkt(&node->ss.ps); } return slot; } /* * If necessary, try to fetch another row from the subplan. * * Note: the eof_underlying state variable exists to short-circuit further * subplan calls. It's not optional, unfortunately, because some plan * node types are not robust about being called again when they've already * returned NULL. * If reusing cached workfiles, there is no need to execute subplan at all. */ if (eof_tuplestore && !node->eof_underlying) { PlanState *outerNode; TupleTableSlot *outerslot; Assert(!node->cached_workfiles_found && "we shouldn't get here when using cached workfiles"); /* * We can only get here with forward==true, so no need to worry about * which direction the subplan will go. */ outerNode = outerPlanState(node); outerslot = ExecProcNode(outerNode); if (TupIsNull(outerslot)) { node->eof_underlying = true; if (ntuplestore_created_reusable_workfiles(ts)) { ntuplestore_flush(ts); ntuplestore_mark_workset_complete(ts); } if (!node->ss.ps.delayEagerFree) { ExecEagerFreeMaterial(node); } return NULL; } Gpmon_M_Incr(GpmonPktFromMaterialState(node), GPMON_QEXEC_M_ROWSIN); if (tsa) ntuplestore_acc_put_tupleslot(tsa, outerslot); /* * And return a copy of the tuple. (XXX couldn't we just return the * outerslot?) */ Gpmon_M_Incr_Rows_Out(GpmonPktFromMaterialState(node)); CheckSendPlanStateGpmonPkt(&node->ss.ps); return ExecCopySlot(slot, outerslot); } if (!node->ss.ps.delayEagerFree) { ExecEagerFreeMaterial(node); } /* * Nothing left ... */ return NULL; }
/* ------------------------------------------------------------------ * ShareInputNext * Retrieve a tuple from the ShareInputScan * ------------------------------------------------------------------ */ TupleTableSlot * ShareInputNext(ShareInputScanState *node) { EState *estate; ScanDirection dir; bool forward; TupleTableSlot *slot; ShareInputScan * sisc = (ShareInputScan *) node->ss.ps.plan; ShareType share_type = sisc->share_type; /* * get state info from node */ estate = node->ss.ps.state; dir = estate->es_direction; forward = ScanDirectionIsForward(dir); /* if first time call, need to initialize the tuplestore state. */ if(node->ts_state == NULL) { elog(DEBUG1, "SISC (shareid=%d, slice=%d): No tuplestore yet, initializing tuplestore", sisc->share_id, currentSliceId); init_tuplestore_state(node); } slot = node->ss.ps.ps_ResultTupleSlot; while(1) { bool gotOK = false; if(share_type == SHARE_MATERIAL || share_type == SHARE_MATERIAL_XSLICE) { ntuplestore_acc_advance((NTupleStoreAccessor *) node->ts_pos, forward ? 1 : -1); gotOK = ntuplestore_acc_current_tupleslot((NTupleStoreAccessor *) node->ts_pos, slot); } else { if(gp_enable_mk_sort) { gotOK = tuplesort_gettupleslot_pos_mk(node->ts_state->sortstore_mk, (TuplesortPos_mk *)node->ts_pos, forward, slot); } else { gotOK = tuplesort_gettupleslot_pos(node->ts_state->sortstore, (TuplesortPos *)node->ts_pos, forward, slot); } } if(!gotOK) return NULL; Gpmon_M_Incr_Rows_Out(GpmonPktFromShareInputState(node)); CheckSendPlanStateGpmonPkt(&node->ss.ps); return slot; } Assert(!"should not be here"); return NULL; }