3b5a0b6060
Implement intersect and except planner. This CL does not implement intersect and except node in execution level.
98 lines
4.1 KiB
C++
98 lines
4.1 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_EXCEPT_NODE_H
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#define DORIS_BE_SRC_QUERY_EXEC_EXCEPT_NODE_H
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#include "exec/exec_node.h"
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#include "runtime/row_batch.h"
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#include "runtime/runtime_state.h"
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namespace doris {
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// Node that calulate the except results of its children by either materializing their
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// evaluated expressions into row batches or passing through (forwarding) the
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// batches if the input tuple layout is identical to the output tuple layout
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// and expressions don't need to be evaluated. The children should be ordered
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// such that all passthrough children come before the children that need
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// materialization. The except node pulls from its children sequentially, i.e.
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// it exhausts one child completely before moving on to the next one.
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class ExceptNode : public ExecNode {
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public:
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ExceptNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);
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virtual Status init(const TPlanNode& tnode, RuntimeState* state = nullptr);
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virtual Status prepare(RuntimeState* state);
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virtual void codegen(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 reset(RuntimeState* state);
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virtual Status close(RuntimeState* state);
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private:
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/// Tuple id resolved in Prepare() to set tuple_desc_;
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const int _tuple_id;
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/// Descriptor for tuples this union node constructs.
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const TupleDescriptor* _tuple_desc;
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/// Index of the first non-passthrough child; i.e. a child that needs materialization.
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/// 0 when all children are materialized, '_children.size()' when no children are
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/// materialized.
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const int _first_materialized_child_idx;
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/// Const exprs materialized by this node. These exprs don't refer to any children.
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/// Only materialized by the first fragment instance to avoid duplication.
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std::vector<std::vector<ExprContext*>> _const_expr_lists;
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/// Exprs materialized by this node. The i-th result expr list refers to the i-th child.
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std::vector<std::vector<ExprContext*>> _child_expr_lists;
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/////////////////////////////////////////
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/// BEGIN: Members that must be Reset()
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/// Index of current child.
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int _child_idx;
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/// Current row batch of current child. We reset the pointer to a new RowBatch
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/// when switching to a different child.
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std::unique_ptr<RowBatch> _child_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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typedef void (*ExceptMaterializeBatchFn)(ExceptNode*, RowBatch*, uint8_t**);
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/// Vector of pointers to codegen'ed materialize_batch functions. The vector contains one
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/// function for each child. The size of the vector should be equal to the number of
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/// children. If a child is passthrough, there should be a NULL for that child. If
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/// Codegen is disabled, there should be a NULL for every child.
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std::vector<ExceptMaterializeBatchFn> _codegend_except_materialize_batch_fns;
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/// Saved from the last to GetNext() on the current child.
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bool _child_eos;
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/// Index of current const result expr list.
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int _const_expr_list_idx;
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/// Index of the child that needs to be closed on the next GetNext() call. Should be set
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/// to -1 if no child needs to be closed.
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int _to_close_child_idx;
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};
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}; // namespace doris
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#endif // DORIS_BE_SRC_QUERY_EXEC_EXCEPT_NODE_H
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