| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| /* |
| * execAppendOnlyScan.c |
| * Support routines for scanning AppendOnly tables. |
| * |
| */ |
| #include "postgres.h" |
| |
| #include "executor/executor.h" |
| #include "nodes/execnodes.h" |
| #include "cdb/cdbappendonlyam.h" |
| |
| TupleTableSlot * |
| AppendOnlyScanNext(ScanState *scanState) |
| { |
| Assert(IsA(scanState, TableScanState) || |
| IsA(scanState, DynamicTableScanState)); |
| AppendOnlyScanState *node = (AppendOnlyScanState *)scanState; |
| |
| AppendOnlyScanDesc scandesc; |
| Index scanrelid; |
| EState *estate; |
| ScanDirection direction; |
| TupleTableSlot *slot; |
| |
| Assert((node->ss.scan_state & SCAN_SCAN) != 0); |
| /* |
| * get information from the estate and scan state |
| */ |
| estate = node->ss.ps.state; |
| scandesc = node->aos_ScanDesc; |
| scanrelid = ((AppendOnlyScan *) node->ss.ps.plan)->scan.scanrelid; |
| direction = estate->es_direction; |
| slot = node->ss.ss_ScanTupleSlot; |
| |
| /* |
| * put the next tuple from the access methods in our tuple slot |
| */ |
| appendonly_getnext(scandesc, direction, slot); |
| |
| return slot; |
| } |
| |
| void |
| BeginScanAppendOnlyRelation(ScanState *scanState) |
| { |
| Assert(IsA(scanState, TableScanState) || |
| IsA(scanState, DynamicTableScanState)); |
| AppendOnlyScanState *node = (AppendOnlyScanState *)scanState; |
| |
| Assert(node->ss.scan_state == SCAN_INIT || |
| node->ss.scan_state == SCAN_DONE); |
| Assert(node->aos_ScanDesc == NULL); |
| |
| node->aos_ScanDesc = appendonly_beginscan( |
| node->ss.ss_currentRelation, |
| node->ss.ps.state->es_snapshot, |
| 0, NULL); |
| |
| node->aos_ScanDesc->splits = scanState->splits; |
| node->ss.scan_state = SCAN_SCAN; |
| } |
| |
| void |
| EndScanAppendOnlyRelation(ScanState *scanState) |
| { |
| Assert(IsA(scanState, TableScanState) || |
| IsA(scanState, DynamicTableScanState)); |
| AppendOnlyScanState *node = (AppendOnlyScanState *)scanState; |
| Assert(node->aos_ScanDesc != NULL); |
| |
| Assert((node->ss.scan_state & SCAN_SCAN) != 0); |
| appendonly_endscan(node->aos_ScanDesc); |
| |
| node->aos_ScanDesc = NULL; |
| |
| node->ss.scan_state = SCAN_INIT; |
| } |
| |
| void |
| ReScanAppendOnlyRelation(ScanState *scanState) |
| { |
| Assert(IsA(scanState, TableScanState) || |
| IsA(scanState, DynamicTableScanState)); |
| AppendOnlyScanState *node = (AppendOnlyScanState *)scanState; |
| Assert(node->aos_ScanDesc != NULL); |
| |
| appendonly_rescan(node->aos_ScanDesc, NULL /* new scan keys */); |
| } |