OmniSciDB  04ee39c94c
QueryPhysicalInputsCollector.h
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1 /*
2  * Copyright 2017 MapD Technologies, Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 /*
18  * @file QueryPhysicalInputsCollector.h
19  * @author Alex Suhan <alex@mapd.com>
20  * @brief Find out all the physical inputs (columns) a query is using.
21  *
22  * Copyright (c) 2016 MapD Technologies, Inc. All rights reserved.
23  */
24 
25 #ifndef QUERYENGINE_QUERYPHYSICALINPUTSCOLLECTOR_H
26 #define QUERYENGINE_QUERYPHYSICALINPUTSCOLLECTOR_H
27 
28 #include <unordered_set>
29 
30 class RelAlgNode;
31 
32 struct PhysicalInput {
33  int col_id;
34  int table_id;
35 
36  bool operator==(const PhysicalInput& that) const {
37  return col_id == that.col_id && table_id == that.table_id;
38  }
39 };
40 
41 namespace std {
42 
43 template <>
44 struct hash<PhysicalInput> {
45  size_t operator()(const PhysicalInput& phys_input) const {
46  return phys_input.col_id ^ phys_input.table_id;
47  }
48 };
49 
50 } // namespace std
51 
52 std::unordered_set<PhysicalInput> get_physical_inputs(const RelAlgNode*);
53 std::unordered_set<int> get_physical_table_inputs(const RelAlgNode*);
54 
55 #endif // QUERYENGINE_QUERYPHYSICALINPUTSCOLLECTOR_H
bool operator==(const PhysicalInput &that) const
size_t operator()(const PhysicalInput &phys_input) const
std::unordered_set< int > get_physical_table_inputs(const RelAlgNode *)
std::unordered_set< PhysicalInput > get_physical_inputs(const RelAlgNode *)