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47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#pragma once
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#include <Parsers/ASTWithAlias.h>
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#include <Parsers/ASTExpressionList.h>
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namespace DB
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{
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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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public:
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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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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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};
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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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const 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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