97 lines
3.1 KiB
C++
97 lines
3.1 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_MYSQL_SCAN_NODE_H
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#define DORIS_BE_SRC_QUERY_EXEC_MYSQL_SCAN_NODE_H
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#include <memory>
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#include "runtime/descriptors.h"
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#include "exec/mysql_scanner.h"
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#include "exec/scan_node.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 MysqlScanNode : public ScanNode {
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public:
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MysqlScanNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);
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~MysqlScanNode();
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// initialize _mysql_scanner, and create _text_converter.
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virtual Status prepare(RuntimeState* state);
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// Start MySQL scan using _mysql_scanner.
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virtual Status open(RuntimeState* state);
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// Fill the next row batch by calling next() on the _mysql_scanner,
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// converting text data in MySQL cells to binary data.
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virtual Status get_next(RuntimeState* state, RowBatch* row_batch, bool* eos);
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// Close the _mysql_scanner, and report errors.
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virtual Status close(RuntimeState* state);
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// No use
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virtual Status set_scan_ranges(const std::vector<TScanRangeParams>& scan_ranges);
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protected:
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// Write debug string of this into out.
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virtual void debug_string(int indentation_level, std::stringstream* out) const;
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private:
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// Writes a slot in _tuple from an MySQL value containing text data.
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// The Mysql value is converted into the appropriate target type.
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Status write_text_slot(char* value, int value_length, SlotDescriptor* slot,
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RuntimeState* state);
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bool _is_init;
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MysqlScannerParam _my_param;
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// Name of Mysql table
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std::string _table_name;
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// Tuple id resolved in prepare() to set _tuple_desc;
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TupleId _tuple_id;
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// select columns
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std::vector<std::string> _columns;
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// where clause
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std::vector<std::string> _filters;
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// Descriptor of tuples read from MySQL table.
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const TupleDescriptor* _tuple_desc;
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// Tuple index in tuple row.
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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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std::unique_ptr<MemPool> _tuple_pool;
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// Jni helper for scanning an HBase table.
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std::unique_ptr<MysqlScanner> _mysql_scanner;
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// Helper class for converting text to other types;
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std::unique_ptr<TextConverter> _text_converter;
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// Current tuple.
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Tuple* _tuple = nullptr;
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};
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}
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#endif
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