1 | #pragma once |
2 | |
3 | #include <Parsers/IAST.h> |
4 | |
5 | |
6 | namespace DB |
7 | { |
8 | /** Element of expression with ASC or DESC, |
9 | * and possibly with COLLATE. |
10 | */ |
11 | class ASTOrderByElement : public IAST |
12 | { |
13 | public: |
14 | int direction; /// 1 for ASC, -1 for DESC |
15 | int nulls_direction; /// Same as direction for NULLS LAST, opposite for NULLS FIRST. |
16 | bool nulls_direction_was_explicitly_specified; |
17 | |
18 | /** Collation for locale-specific string comparison. If empty, then sorting done by bytes. */ |
19 | ASTPtr collation; |
20 | |
21 | bool with_fill; |
22 | ASTPtr fill_from; |
23 | ASTPtr fill_to; |
24 | ASTPtr fill_step; |
25 | |
26 | ASTOrderByElement( |
27 | const int direction_, const int nulls_direction_, const bool nulls_direction_was_explicitly_specified_, |
28 | ASTPtr & collation_, const bool with_fill_, ASTPtr & fill_from_, ASTPtr & fill_to_, ASTPtr & fill_step_) |
29 | : direction(direction_) |
30 | , nulls_direction(nulls_direction_) |
31 | , nulls_direction_was_explicitly_specified(nulls_direction_was_explicitly_specified_) |
32 | , collation(collation_) |
33 | , with_fill(with_fill_) |
34 | , fill_from(fill_from_) |
35 | , fill_to(fill_to_) |
36 | , fill_step(fill_step_) |
37 | { |
38 | } |
39 | |
40 | String getID(char) const override { return "OrderByElement" ; } |
41 | |
42 | ASTPtr clone() const override |
43 | { |
44 | auto clone = std::make_shared<ASTOrderByElement>(*this); |
45 | clone->cloneChildren(); |
46 | return clone; |
47 | } |
48 | |
49 | protected: |
50 | void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override; |
51 | }; |
52 | } |
53 | |