| // 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. |
| |
| #include "exec/singular-row-src-node.h" |
| #include "exec/subplan-node.h" |
| #include "runtime/row-batch.h" |
| #include "runtime/runtime-state.h" |
| |
| namespace impala { |
| |
| Status SingularRowSrcPlanNode::CreateExecNode( |
| RuntimeState* state, ExecNode** node) const { |
| ObjectPool* pool = state->obj_pool(); |
| *node = pool->Add(new SingularRowSrcNode(pool, *this, state->desc_tbl())); |
| return Status::OK(); |
| } |
| |
| SingularRowSrcNode::SingularRowSrcNode( |
| ObjectPool* pool, const SingularRowSrcPlanNode& pnode, const DescriptorTbl& descs) |
| : ExecNode(pool, pnode, descs) {} |
| |
| Status SingularRowSrcNode::GetNext(RuntimeState* state, RowBatch* row_batch, bool* eos) { |
| // We do not time this function, check for cancellation, or perform the usual per-batch |
| // query maintenance because those would dominate the execution cost of this node. |
| DCHECK(containing_subplan_ != NULL) << "set_containing_subplan() must be called"; |
| |
| // Only produces a single row per GetNext() call. |
| *eos = true; |
| int row_idx = row_batch->AddRow(); |
| TupleRow* row = row_batch->GetRow(row_idx); |
| row_batch->CopyRow(containing_subplan_->current_row(), row); |
| row_batch->CommitLastRow(); |
| return Status::OK(); |
| } |
| |
| } |