97 lines
2.7 KiB
C++
97 lines
2.7 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_SCANNER_H
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#define DORIS_BE_SRC_QUERY_EXEC_SCHEMA_SCANNER_H
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#include <string>
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#include "common/status.h"
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#include "common/object_pool.h"
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#include "gen_cpp/Descriptors_types.h"
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#include "runtime/tuple.h"
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#include "runtime/mem_pool.h"
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namespace doris {
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// forehead declar class, because jni function init in DorisServer.
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class DorisServer;
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class RuntimeState;
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// scanner parameter from frontend
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struct SchemaScannerParam {
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const std::string* db;
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const std::string* table;
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const std::string* wild;
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const std::string* user;
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const std::string* user_ip;
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const std::string* ip;
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int32_t port;
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int64_t thread_id;
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SchemaScannerParam()
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: db(NULL), table(NULL), wild(NULL), user(NULL), user_ip(NULL), ip(NULL), port(0) { }
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};
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// virtual scanner for all schema table
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class SchemaScanner {
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public:
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struct ColumnDesc {
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const char* name;
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PrimitiveType type;
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int size;
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bool is_null;
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};
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SchemaScanner(ColumnDesc* columns, int column_num);
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virtual ~SchemaScanner();
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// init object need infomation, schema etc.
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virtual Status init(SchemaScannerParam* param, ObjectPool* pool);
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// Start to work
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virtual Status start(RuntimeState* state);
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virtual Status get_next_row(Tuple* tuple, MemPool* pool, bool* eos);
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// factory function
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static SchemaScanner* create(TSchemaTableType::type type);
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const TupleDescriptor* tuple_desc() const {
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return _tuple_desc;
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}
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static void set_doris_server(DorisServer* doris_server) {
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_s_doris_server = doris_server;
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}
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protected:
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Status create_tuple_desc(ObjectPool* pool);
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bool _is_init;
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// this is used for sub class
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SchemaScannerParam* _param;
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// pointer to schema table's column desc
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ColumnDesc* _columns;
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// num of columns
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int _column_num;
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TupleDescriptor* _tuple_desc;
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static DorisServer* _s_doris_server;
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};
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}
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#endif
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