79 lines
3.0 KiB
C++
79 lines
3.0 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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#ifndef DORIS_BE_SRC_QUERY_EXEC_CROSS_JOIN_NODE_H
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#define DORIS_BE_SRC_QUERY_EXEC_CROSS_JOIN_NODE_H
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#include <boost/scoped_ptr.hpp>
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#include <boost/thread.hpp>
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#include <boost/unordered_set.hpp>
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#include <string>
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#include "exec/blocking_join_node.h"
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#include "exec/exec_node.h"
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#include "exec/row_batch_list.h"
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#include "gen_cpp/PlanNodes_types.h"
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#include "runtime/descriptors.h"
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#include "runtime/mem_pool.h"
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namespace doris {
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class RowBatch;
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class TupleRow;
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// Node for cross joins.
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// Iterates over the left child rows and then the right child rows and, for
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// each combination, writes the output row if the conjuncts are satisfied. The
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// build batches are kept in a list that is fully constructed from the right child in
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// construct_build_side() (called by BlockingJoinNode::open()) while rows are fetched from
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// the left child as necessary in get_next().
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class CrossJoinNode : public BlockingJoinNode {
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public:
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CrossJoinNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);
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virtual Status prepare(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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protected:
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virtual void init_get_next(TupleRow* first_left_row);
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virtual Status construct_build_side(RuntimeState* state);
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private:
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// Object pool for build RowBatches, stores all BuildBatches in _build_rows
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boost::scoped_ptr<ObjectPool> _build_batch_pool;
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// List of build batches, constructed in prepare()
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RowBatchList _build_batches;
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RowBatchList::TupleRowIterator _current_build_row;
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// Processes a batch from the left child.
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// output_batch: the batch for resulting tuple rows
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// batch: the batch from the left child to process. This function can be called to
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// continue processing a batch in the middle
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// max_added_rows: maximum rows that can be added to output_batch
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// return the number of rows added to output_batch
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int process_left_child_batch(RowBatch* output_batch, RowBatch* batch, int max_added_rows);
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// Returns a debug string for _build_rows. This is used for debugging during the
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// build list construction and before doing the join.
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std::string build_list_debug_string();
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};
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} // namespace doris
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#endif
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