cross-join-node.h

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// Copyright 2013 Cloudera Inc.
//
// Licensed 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.


#ifndef IMPALA_EXEC_CROSS_JOIN_NODE_H
#define IMPALA_EXEC_CROSS_JOIN_NODE_H

#include <boost/scoped_ptr.hpp>
#include <boost/unordered_set.hpp>
#include <boost/thread.hpp>
#include <string>

#include "exec/exec-node.h"
#include "exec/blocking-join-node.h"
#include "exec/row-batch-list.h"
#include "runtime/descriptors.h"  // for TupleDescriptor
#include "runtime/mem-pool.h"
#include "util/promise.h"

#include "gen-cpp/PlanNodes_types.h"

namespace impala {

class RowBatch;
class TupleRow;

class CrossJoinNode : public BlockingJoinNode {
 public:
  CrossJoinNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);

  virtual Status Prepare(RuntimeState* state);
  virtual Status GetNext(RuntimeState* state, RowBatch* row_batch, bool* eos);
  virtual Status Reset(RuntimeState* state);
  virtual void Close(RuntimeState* state);

 protected:
  virtual Status InitGetNext(TupleRow* first_left_row);
  virtual Status ConstructBuildSide(RuntimeState* state);

 private:
  boost::scoped_ptr<ObjectPool> build_batch_pool_;
  RowBatchList build_batches_;
  RowBatchList::TupleRowIterator current_build_row_;

  int ProcessLeftChildBatch(RowBatch* output_batch, RowBatch* batch, int max_added_rows);

  std::string BuildListDebugString();
};

}

#endif