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79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
#pragma once
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#include <Parsers/ASTWithAlias.h>
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#include <Parsers/ASTExpressionList.h>
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#include <Parsers/ASTSelectWithUnionQuery.h>
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namespace DB
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{
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class ASTIdentifier;
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/** AST for function application or operator.
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*/
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class ASTFunction : public ASTWithAlias
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{
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public:
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String name;
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ASTPtr arguments;
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/// parameters - for parametric aggregate function. Example: quantile(0.9)(x) - what in first parens are 'parameters'.
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ASTPtr parameters;
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bool is_window_function = false;
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// We have to make these fields ASTPtr because this is what the visitors
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// expect. Some of them take const ASTPtr & (makes no sense), and some
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// take ASTPtr & and modify it. I don't understand how the latter is
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// compatible with also having an owning `children` array -- apparently it
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// leads to some dangling children that are not referenced by the fields of
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// the AST class itself. Some older code hints at the idea of having
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// ownership in `children` only, and making the class fields to be raw
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// pointers of proper type (see e.g. IAST::set), but this is not compatible
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// with the visitor interface.
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String window_name;
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ASTPtr window_definition;
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/// do not print empty parentheses if there are no args - compatibility with new AST for data types and engine names.
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bool no_empty_args = false;
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/** Get text identifying the AST node. */
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String getID(char delim) const override;
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ASTPtr clone() const override;
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void updateTreeHashImpl(SipHash & hash_state) const override;
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ASTSelectWithUnionQuery * tryGetQueryArgument() const;
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ASTPtr toLiteral() const; // Try to convert functions like Array or Tuple to a literal form.
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std::string getWindowDescription() const;
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protected:
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void formatImplWithoutAlias(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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void appendColumnNameImpl(WriteBuffer & ostr) const override;
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void appendColumnNameImpl(WriteBuffer & ostr, const Settings & settings) const override;
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private:
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void appendColumnNameImpl(WriteBuffer & ostr, const Settings * settings) const;
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};
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template <typename... Args>
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std::shared_ptr<ASTFunction> makeASTFunction(const String & name, Args &&... args)
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{
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auto function = std::make_shared<ASTFunction>();
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function->name = name;
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function->arguments = std::make_shared<ASTExpressionList>();
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function->children.push_back(function->arguments);
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function->arguments->children = { std::forward<Args>(args)... };
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return function;
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}
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}
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