ClickHouse/dbms/include/DB/Parsers/ASTFunction.h

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#pragma once
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#include <DB/Parsers/IAST.h>
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#include <DB/Functions/IFunction.h>
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#include <DB/AggregateFunctions/IAggregateFunction.h>
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#include <DB/IO/WriteBufferFromString.h>
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namespace DB
{
/** Применение функции или оператора
*/
class ASTFunction : public IAST
{
public:
enum FunctionKind
{
UNKNOWN,
TABLE_FUNCTION,
FUNCTION,
AGGREGATE_FUNCTION,
LAMBDA_EXPRESSION,
ARRAY_JOIN,
};
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/// имя функции
String name;
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/// аргументы
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ASTPtr arguments;
/// параметры - для параметрических агрегатных функций. Пример: quantile(0.9)(x) - то, что в первых скобках - параметры.
ASTPtr parameters;
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/// алиас, если есть
String alias;
FunctionKind kind;
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ASTFunction() : kind(UNKNOWN) {}
ASTFunction(StringRange range_) : IAST(range_), kind(UNKNOWN) {}
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String getColumnName() const
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{
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String res;
WriteBufferFromString wb(res);
writeString(name, wb);
if (parameters)
{
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writeChar('(', wb);
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for (ASTs::const_iterator it = parameters->children.begin(); it != parameters->children.end(); ++it)
{
if (it != parameters->children.begin())
writeCString(", ", wb);
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writeString((*it)->getColumnName(), wb);
}
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writeChar(')', wb);
}
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writeChar('(', wb);
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for (ASTs::const_iterator it = arguments->children.begin(); it != arguments->children.end(); ++it)
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{
if (it != arguments->children.begin())
writeCString(", ", wb);
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writeString((*it)->getColumnName(), wb);
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}
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writeChar(')', wb);
return res;
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}
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String getAlias() const { return alias.empty() ? getColumnName() : alias; }
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/** Получить текст, который идентифицирует этот элемент. */
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String getID() const { return "Function_" + name; }
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ASTPtr clone() const
{
ASTFunction * res = new ASTFunction(*this);
res->children.clear();
if (arguments) { res->arguments = arguments->clone(); res->children.push_back(res->arguments); }
if (parameters) { res->parameters = parameters->clone(); res->children.push_back(res->parameters); }
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return res;
}
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};
}