58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// This file is copied from
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// https://github.com/apache/impala/blob/branch-2.9.0/be/src/exec/select-node.h
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// and modified by Doris
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#pragma once
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#include "exec/exec_node.h"
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namespace doris {
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class Tuple;
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class TupleRow;
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// Node that evaluates conjuncts and enforces a limit but otherwise passes along
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// the rows pulled from its child unchanged.
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class SelectNode : public ExecNode {
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public:
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SelectNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);
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virtual Status prepare(RuntimeState* state);
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virtual Status open(RuntimeState* state);
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virtual Status get_next(RuntimeState* state, RowBatch* row_batch, bool* eos);
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virtual Status close(RuntimeState* state);
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private:
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// current row batch of child
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std::unique_ptr<RowBatch> _child_row_batch;
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// index of current row in _child_row_batch
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int _child_row_idx;
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// true if last get_next() call on child signalled eos
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bool _child_eos;
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// Copy rows from _child_row_batch for which _conjuncts evaluate to true to
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// output_batch, up to _limit.
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// Return true if limit was hit or output_batch should be returned, otherwise false.
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bool copy_rows(RowBatch* output_batch);
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};
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} // namespace doris
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