1 | #pragma once |
---|---|
2 | |
3 | #include <Parsers/ASTWithAlias.h> |
4 | #include <Parsers/ASTExpressionList.h> |
5 | |
6 | |
7 | namespace DB |
8 | { |
9 | |
10 | /** AST for function application or operator. |
11 | */ |
12 | class ASTFunction : public ASTWithAlias |
13 | { |
14 | public: |
15 | String name; |
16 | ASTPtr arguments; |
17 | /// parameters - for parametric aggregate function. Example: quantile(0.9)(x) - what in first parens are 'parameters'. |
18 | ASTPtr parameters; |
19 | |
20 | public: |
21 | /** Get text identifying the AST node. */ |
22 | String getID(char delim) const override; |
23 | |
24 | ASTPtr clone() const override; |
25 | |
26 | protected: |
27 | void formatImplWithoutAlias(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override; |
28 | void appendColumnNameImpl(WriteBuffer & ostr) const override; |
29 | }; |
30 | |
31 | |
32 | template <typename... Args> |
33 | std::shared_ptr<ASTFunction> makeASTFunction(const String & name, Args &&... args) |
34 | { |
35 | const auto function = std::make_shared<ASTFunction>(); |
36 | |
37 | function->name = name; |
38 | function->arguments = std::make_shared<ASTExpressionList>(); |
39 | function->children.push_back(function->arguments); |
40 | |
41 | function->arguments->children = { std::forward<Args>(args)... }; |
42 | |
43 | return function; |
44 | } |
45 | |
46 | } |
47 |