98 lines
3.2 KiB
C++
98 lines
3.2 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_SCHEMA_SCAN_NODE_H
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#define DORIS_BE_SRC_QUERY_EXEC_SCHEMA_SCAN_NODE_H
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#include <boost/scoped_ptr.hpp>
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#include "exec/scan_node.h"
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#include "exec/schema_scanner.h"
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#include "gen_cpp/Descriptors_types.h"
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#include "runtime/descriptors.h"
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namespace doris {
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class TextConverter;
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class Tuple;
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class TupleDescriptor;
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class RuntimeState;
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class MemPool;
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class Status;
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class SchemaScanNode : public ScanNode {
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public:
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SchemaScanNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);
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~SchemaScanNode();
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// Prepare conjuncts, create Schema columns to slots mapping
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// initialize _schema_scanner
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Status init(const TPlanNode& tnode, RuntimeState* state = nullptr) override;
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// Prepare conjuncts, create Schema columns to slots mapping
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// initialize _schema_scanner
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Status prepare(RuntimeState* state) override;
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// Start Schema scan using _schema_scanner.
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Status open(RuntimeState* state) override;
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// Fill the next row batch by calling next() on the _schema_scanner,
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Status get_next(RuntimeState* state, RowBatch* row_batch, bool* eos) override;
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// Close the _schema_scanner, and report errors.
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Status close(RuntimeState* state) override;
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// this is no use in this class
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Status set_scan_ranges(const std::vector<TScanRangeParams>& scan_ranges) override;
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private:
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// Write debug string of this into out.
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void debug_string(int indentation_level, std::stringstream* out) const override;
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// Copy one row from schema table to input tuple
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void copy_one_row();
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bool _is_init;
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const std::string _table_name;
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SchemaScannerParam _scanner_param;
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// Tuple id resolved in prepare() to set _tuple_desc;
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TupleId _tuple_id;
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// Descriptor of tuples read from schema table.
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const TupleDescriptor* _src_tuple_desc;
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// Descriptor of dest tuples
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const TupleDescriptor* _dest_tuple_desc;
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// Tuple index in tuple row.
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int _tuple_idx;
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// slot num need to fill in and return
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int _slot_num;
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// Pool for allocating tuple data, including all varying-length slots.
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boost::scoped_ptr<MemPool> _tuple_pool;
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// Jni helper for scanning an schema table.
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boost::scoped_ptr<SchemaScanner> _schema_scanner;
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// Current tuple.
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Tuple* _src_tuple;
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Tuple* _dest_tuple;
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// Map from index in slots to column of schema table.
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std::vector<int> _index_map;
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};
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}
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#endif //__DORIS_MYSQLSCANNODE_H
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/* vim: set ts=4 sw=4 sts=4 tw=100 noet: */
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