1 | #pragma once |
---|---|
2 | |
3 | #include <Interpreters/PreparedSets.h> |
4 | #include <Core/SortDescription.h> |
5 | #include <memory> |
6 | |
7 | namespace DB |
8 | { |
9 | |
10 | class ExpressionActions; |
11 | using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>; |
12 | |
13 | struct PrewhereInfo |
14 | { |
15 | /// Actions which are executed in order to alias columns are used for prewhere actions. |
16 | ExpressionActionsPtr alias_actions; |
17 | /// Actions which are executed on block in order to get filter column for prewhere step. |
18 | ExpressionActionsPtr prewhere_actions; |
19 | /// Actions which are executed after reading from storage in order to remove unused columns. |
20 | ExpressionActionsPtr remove_columns_actions; |
21 | String prewhere_column_name; |
22 | bool remove_prewhere_column = false; |
23 | bool need_filter = false; |
24 | |
25 | PrewhereInfo() = default; |
26 | explicit PrewhereInfo(ExpressionActionsPtr prewhere_actions_, String prewhere_column_name_) |
27 | : prewhere_actions(std::move(prewhere_actions_)), prewhere_column_name(std::move(prewhere_column_name_)) {} |
28 | }; |
29 | |
30 | /// Helper struct to store all the information about the filter expression. |
31 | struct FilterInfo |
32 | { |
33 | ExpressionActionsPtr actions; |
34 | String column_name; |
35 | bool do_remove_column = false; |
36 | }; |
37 | |
38 | struct InputSortingInfo |
39 | { |
40 | SortDescription order_key_prefix_descr; |
41 | int direction; |
42 | |
43 | InputSortingInfo(const SortDescription & order_key_prefix_descr_, int direction_) |
44 | : order_key_prefix_descr(order_key_prefix_descr_), direction(direction_) {} |
45 | |
46 | bool operator ==(const InputSortingInfo & other) const |
47 | { |
48 | return order_key_prefix_descr == other.order_key_prefix_descr && direction == other.direction; |
49 | } |
50 | |
51 | bool operator !=(const InputSortingInfo & other) const { return !(*this == other); } |
52 | }; |
53 | |
54 | using PrewhereInfoPtr = std::shared_ptr<PrewhereInfo>; |
55 | using FilterInfoPtr = std::shared_ptr<FilterInfo>; |
56 | using InputSortingInfoPtr = std::shared_ptr<const InputSortingInfo>; |
57 | |
58 | struct SyntaxAnalyzerResult; |
59 | using SyntaxAnalyzerResultPtr = std::shared_ptr<const SyntaxAnalyzerResult>; |
60 | |
61 | class ReadInOrderOptimizer; |
62 | using ReadInOrderOptimizerPtr = std::shared_ptr<const ReadInOrderOptimizer>; |
63 | |
64 | /** Query along with some additional data, |
65 | * that can be used during query processing |
66 | * inside storage engines. |
67 | */ |
68 | struct SelectQueryInfo |
69 | { |
70 | ASTPtr query; |
71 | |
72 | SyntaxAnalyzerResultPtr syntax_analyzer_result; |
73 | |
74 | PrewhereInfoPtr prewhere_info; |
75 | |
76 | ReadInOrderOptimizerPtr order_by_optimizer; |
77 | /// We can modify it while reading from storage |
78 | mutable InputSortingInfoPtr input_sorting_info; |
79 | |
80 | /// Prepared sets are used for indices by storage engine. |
81 | /// Example: x IN (1, 2, 3) |
82 | PreparedSets sets; |
83 | }; |
84 | |
85 | } |
86 |