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https://github.com/ClickHouse/ClickHouse.git
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388 lines
18 KiB
C++
388 lines
18 KiB
C++
#pragma once
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#include <DB/Core/Field.h>
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/WriteBuffer.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/WriteHelpers.h>
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#include <DB/IO/ReadBufferFromString.h>
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#include <DB/IO/WriteBufferFromString.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int CANNOT_CONVERT_TYPE;
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}
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/** StaticVisitor (его наследники) - класс с перегруженными для разных типов операторами ().
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* Вызвать visitor для field можно с помощью функции apply_visitor.
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* Также поддерживается visitor, в котором оператор () принимает два аргумента.
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*/
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template <typename R = void>
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struct StaticVisitor
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{
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using ResultType = R;
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};
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template <typename Visitor, typename F>
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typename Visitor::ResultType apply_visitor_impl(Visitor & visitor, F & field)
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{
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switch (field.getType())
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{
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case Field::Types::Null: return visitor(field.template get<Null>());
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case Field::Types::UInt64: return visitor(field.template get<UInt64>());
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case Field::Types::Int64: return visitor(field.template get<Int64>());
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case Field::Types::Float64: return visitor(field.template get<Float64>());
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case Field::Types::String: return visitor(field.template get<String>());
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case Field::Types::Array: return visitor(field.template get<Array>());
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case Field::Types::Tuple: return visitor(field.template get<Tuple>());
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default:
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throw Exception("Bad type of Field", ErrorCodes::BAD_TYPE_OF_FIELD);
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}
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}
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/** Эти штуки нужны, чтобы принимать временный объект по константной ссылке.
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* В шаблон выше, типы форвардятся уже с const-ом.
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*/
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(const Visitor & visitor, Field & field)
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{
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return apply_visitor_impl(visitor, field);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(const Visitor & visitor, const Field & field)
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{
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return apply_visitor_impl(visitor, field);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(Visitor & visitor, Field & field)
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{
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return apply_visitor_impl(visitor, field);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(Visitor & visitor, const Field & field)
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{
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return apply_visitor_impl(visitor, field);
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}
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template <typename Visitor, typename F1, typename F2>
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typename Visitor::ResultType apply_binary_visitor_impl2(Visitor & visitor, F1 & field1, F2 & field2)
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{
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switch (field2.getType())
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{
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case Field::Types::Null: return visitor(field1, field2.template get<Null>());
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case Field::Types::UInt64: return visitor(field1, field2.template get<UInt64>());
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case Field::Types::Int64: return visitor(field1, field2.template get<Int64>());
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case Field::Types::Float64: return visitor(field1, field2.template get<Float64>());
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case Field::Types::String: return visitor(field1, field2.template get<String>());
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case Field::Types::Array: return visitor(field1, field2.template get<Array>());
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case Field::Types::Tuple: return visitor(field1, field2.template get<Tuple>());
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default:
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throw Exception("Bad type of Field", ErrorCodes::BAD_TYPE_OF_FIELD);
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}
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}
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template <typename Visitor, typename F1, typename F2>
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typename Visitor::ResultType apply_binary_visitor_impl1(Visitor & visitor, F1 & field1, F2 & field2)
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{
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switch (field1.getType())
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{
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case Field::Types::Null: return apply_binary_visitor_impl2(visitor, field1.template get<Null>(), field2);
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case Field::Types::UInt64: return apply_binary_visitor_impl2(visitor, field1.template get<UInt64>(), field2);
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case Field::Types::Int64: return apply_binary_visitor_impl2(visitor, field1.template get<Int64>(), field2);
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case Field::Types::Float64: return apply_binary_visitor_impl2(visitor, field1.template get<Float64>(), field2);
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case Field::Types::String: return apply_binary_visitor_impl2(visitor, field1.template get<String>(), field2);
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case Field::Types::Array: return apply_binary_visitor_impl2(visitor, field1.template get<Array>(), field2);
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case Field::Types::Tuple: return apply_binary_visitor_impl2(visitor, field1.template get<Tuple>(), field2);
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default:
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throw Exception("Bad type of Field", ErrorCodes::BAD_TYPE_OF_FIELD);
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}
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(Visitor & visitor, Field & field1, Field & field2)
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{
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return apply_binary_visitor_impl1(visitor, field1, field2);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(Visitor & visitor, Field & field1, const Field & field2)
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{
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return apply_binary_visitor_impl1(visitor, field1, field2);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(Visitor & visitor, const Field & field1, Field & field2)
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{
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return apply_binary_visitor_impl1(visitor, field1, field2);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(Visitor & visitor, const Field & field1, const Field & field2)
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{
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return apply_binary_visitor_impl1(visitor, field1, field2);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(const Visitor & visitor, Field & field1, Field & field2)
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{
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return apply_binary_visitor_impl1(visitor, field1, field2);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(const Visitor & visitor, Field & field1, const Field & field2)
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{
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return apply_binary_visitor_impl1(visitor, field1, field2);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(const Visitor & visitor, const Field & field1, Field & field2)
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{
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return apply_binary_visitor_impl1(visitor, field1, field2);
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}
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template <typename Visitor>
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typename Visitor::ResultType apply_visitor(const Visitor & visitor, const Field & field1, const Field & field2)
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{
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return apply_binary_visitor_impl1(visitor, field1, field2);
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}
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/** Возвращает строковый дамп типа */
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class FieldVisitorDump : public StaticVisitor<String>
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{
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private:
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template <typename T>
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static inline String formatQuotedWithPrefix(T x, const char * prefix)
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{
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String res;
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WriteBufferFromString wb(res);
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wb.write(prefix, strlen(prefix));
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writeQuoted(x, wb);
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return res;
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}
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public:
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String operator() (const Null & x) const { return "NULL"; }
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String operator() (const UInt64 & x) const { return formatQuotedWithPrefix(x, "UInt64_"); }
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String operator() (const Int64 & x) const { return formatQuotedWithPrefix(x, "Int64_"); }
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String operator() (const Float64 & x) const { return formatQuotedWithPrefix(x, "Float64_"); }
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String operator() (const String & x) const;
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String operator() (const Array & x) const;
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String operator() (const Tuple & x) const;
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};
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/** Выводит текстовое представление типа, как литерала в SQL запросе */
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class FieldVisitorToString : public StaticVisitor<String>
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{
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private:
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template <typename T>
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static inline String formatQuoted(T x)
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{
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String res;
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WriteBufferFromString wb(res);
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writeQuoted(x, wb);
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return res;
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}
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/** В отличие от writeFloatText (и writeQuoted), если число после форматирования выглядит целым, всё равно добавляет десятичную точку.
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* - для того, чтобы это число могло обратно распарситься как Float64 парсером запроса (иначе распарсится как целое).
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*
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* При этом, не оставляет завершающие нули справа.
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*
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* NOTE: При таком roundtrip-е, точность может теряться.
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*/
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static String formatFloat(const Float64 x);
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public:
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String operator() (const Null & x) const { return "NULL"; }
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String operator() (const UInt64 & x) const { return formatQuoted(x); }
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String operator() (const Int64 & x) const { return formatQuoted(x); }
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String operator() (const Float64 & x) const { return formatFloat(x); }
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String operator() (const String & x) const { return formatQuoted(x); }
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String operator() (const Array & x) const;
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String operator() (const Tuple & x) const;
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};
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/** Числовой тип преобразует в указанный. */
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template <typename T>
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class FieldVisitorConvertToNumber : public StaticVisitor<T>
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{
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public:
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T operator() (const Null & x) const
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{
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throw Exception("Cannot convert NULL to " + TypeName<T>::get(), ErrorCodes::CANNOT_CONVERT_TYPE);
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}
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T operator() (const String & x) const
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{
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throw Exception("Cannot convert String to " + TypeName<T>::get(), ErrorCodes::CANNOT_CONVERT_TYPE);
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}
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T operator() (const Array & x) const
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{
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throw Exception("Cannot convert Array to " + TypeName<T>::get(), ErrorCodes::CANNOT_CONVERT_TYPE);
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}
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T operator() (const Tuple & x) const
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{
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throw Exception("Cannot convert Tuple to " + TypeName<T>::get(), ErrorCodes::CANNOT_CONVERT_TYPE);
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}
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T operator() (const UInt64 & x) const { return x; }
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T operator() (const Int64 & x) const { return x; }
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T operator() (const Float64 & x) const { return x; }
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};
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/// Преобразование строки с датой или датой-с-временем в UInt64, содержащим числовое значение даты или даты-с-временем.
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UInt64 stringToDateOrDateTime(const String & s);
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/** More precise comparison, used for index.
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* Differs from Field::operator< and Field::operator== in that it also compares values of different types.
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* Comparison rules are same as in FunctionsComparison (to be consistent with expression evaluation in query).
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* Except in cases when comparing signed and unsigned integers, which is unspecified behavior in FunctionsComparison,
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* and when comparing integers and floats. Comparison is accurate here.
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*/
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class FieldVisitorAccurateEquals : public StaticVisitor<bool>
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{
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using Double128 = long double; /// Non portable. Must have 64 bit mantissa to provide accurate comparisons.
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public:
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bool operator() (const Null & l, const Null & r) const { return true; }
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bool operator() (const Null & l, const UInt64 & r) const { return false; }
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bool operator() (const Null & l, const Int64 & r) const { return false; }
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bool operator() (const Null & l, const Float64 & r) const { return false; }
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bool operator() (const Null & l, const String & r) const { return false; }
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bool operator() (const Null & l, const Array & r) const { return false; }
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bool operator() (const Null & l, const Tuple & r) const { return false; }
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bool operator() (const UInt64 & l, const Null & r) const { return false; }
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bool operator() (const UInt64 & l, const UInt64 & r) const { return l == r; }
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bool operator() (const UInt64 & l, const Int64 & r) const { return r >= 0 && l == UInt64(r); }
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bool operator() (const UInt64 & l, const Float64 & r) const { return Double128(l) == Double128(r); }
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bool operator() (const UInt64 & l, const String & r) const { return l == stringToDateOrDateTime(r); }
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bool operator() (const UInt64 & l, const Array & r) const { return false; }
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bool operator() (const UInt64 & l, const Tuple & r) const { return false; }
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bool operator() (const Int64 & l, const Null & r) const { return false; }
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bool operator() (const Int64 & l, const UInt64 & r) const { return l >= 0 && UInt64(l) == r; }
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bool operator() (const Int64 & l, const Int64 & r) const { return l == r; }
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bool operator() (const Int64 & l, const Float64 & r) const { return Double128(l) == Double128(r); }
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bool operator() (const Int64 & l, const String & r) const { return false; }
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bool operator() (const Int64 & l, const Array & r) const { return false; }
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bool operator() (const Int64 & l, const Tuple & r) const { return false; }
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bool operator() (const Float64 & l, const Null & r) const { return false; }
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bool operator() (const Float64 & l, const UInt64 & r) const { return Double128(l) == Double128(r); }
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bool operator() (const Float64 & l, const Int64 & r) const { return Double128(l) == Double128(r); }
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bool operator() (const Float64 & l, const Float64 & r) const { return l == r; }
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bool operator() (const Float64 & l, const String & r) const { return false; }
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bool operator() (const Float64 & l, const Array & r) const { return false; }
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bool operator() (const Float64 & l, const Tuple & r) const { return false; }
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bool operator() (const String & l, const Null & r) const { return false; }
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bool operator() (const String & l, const UInt64 & r) const { return stringToDateOrDateTime(l) == r; }
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bool operator() (const String & l, const Int64 & r) const { return false; }
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bool operator() (const String & l, const Float64 & r) const { return false; }
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bool operator() (const String & l, const String & r) const { return l == r; }
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bool operator() (const String & l, const Array & r) const { return false; }
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bool operator() (const String & l, const Tuple & r) const { return false; }
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bool operator() (const Array & l, const Null & r) const { return false; }
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bool operator() (const Array & l, const UInt64 & r) const { return false; }
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bool operator() (const Array & l, const Int64 & r) const { return false; }
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bool operator() (const Array & l, const Float64 & r) const { return false; }
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bool operator() (const Array & l, const String & r) const { return false; }
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bool operator() (const Array & l, const Array & r) const { return l == r; }
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bool operator() (const Array & l, const Tuple & r) const { return false; }
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bool operator() (const Tuple & l, const Null & r) const { return false; }
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bool operator() (const Tuple & l, const UInt64 & r) const { return false; }
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bool operator() (const Tuple & l, const Int64 & r) const { return false; }
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bool operator() (const Tuple & l, const Float64 & r) const { return false; }
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bool operator() (const Tuple & l, const String & r) const { return false; }
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bool operator() (const Tuple & l, const Array & r) const { return false; }
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bool operator() (const Tuple & l, const Tuple & r) const { return l == r; }
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};
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class FieldVisitorAccurateLess : public StaticVisitor<bool>
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{
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using Double128 = long double; /// Non portable. Must have 64 bit mantissa to provide accurate comparisons.
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public:
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bool operator() (const Null & l, const Null & r) const { return false; }
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bool operator() (const Null & l, const UInt64 & r) const { return true; }
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bool operator() (const Null & l, const Int64 & r) const { return true; }
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bool operator() (const Null & l, const Float64 & r) const { return true; }
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bool operator() (const Null & l, const String & r) const { return true; }
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bool operator() (const Null & l, const Array & r) const { return true; }
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bool operator() (const Null & l, const Tuple & r) const { return true; }
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bool operator() (const UInt64 & l, const Null & r) const { return false; }
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bool operator() (const UInt64 & l, const UInt64 & r) const { return l < r; }
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bool operator() (const UInt64 & l, const Int64 & r) const { return r >= 0 && l < UInt64(r); }
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bool operator() (const UInt64 & l, const Float64 & r) const { return Double128(l) < Double128(r); }
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bool operator() (const UInt64 & l, const String & r) const { return l < stringToDateOrDateTime(r); }
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bool operator() (const UInt64 & l, const Array & r) const { return true; }
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bool operator() (const UInt64 & l, const Tuple & r) const { return true; }
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bool operator() (const Int64 & l, const Null & r) const { return false; }
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bool operator() (const Int64 & l, const UInt64 & r) const { return l < 0 || UInt64(l) < r; }
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bool operator() (const Int64 & l, const Int64 & r) const { return l < r; }
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bool operator() (const Int64 & l, const Float64 & r) const { return Double128(l) < Double128(r); }
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bool operator() (const Int64 & l, const String & r) const { return true; }
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bool operator() (const Int64 & l, const Array & r) const { return true; }
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bool operator() (const Int64 & l, const Tuple & r) const { return true; }
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bool operator() (const Float64 & l, const Null & r) const { return false; }
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bool operator() (const Float64 & l, const UInt64 & r) const { return Double128(l) < Double128(r); }
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bool operator() (const Float64 & l, const Int64 & r) const { return Double128(l) < Double128(r); }
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bool operator() (const Float64 & l, const Float64 & r) const { return l < r; }
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bool operator() (const Float64 & l, const String & r) const { return true; }
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bool operator() (const Float64 & l, const Array & r) const { return true; }
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bool operator() (const Float64 & l, const Tuple & r) const { return true; }
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bool operator() (const String & l, const Null & r) const { return false; }
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bool operator() (const String & l, const UInt64 & r) const { return stringToDateOrDateTime(l) < r; }
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bool operator() (const String & l, const Int64 & r) const { return false; }
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bool operator() (const String & l, const Float64 & r) const { return false; }
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bool operator() (const String & l, const String & r) const { return l < r; }
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bool operator() (const String & l, const Array & r) const { return true; }
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bool operator() (const String & l, const Tuple & r) const { return true; }
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bool operator() (const Array & l, const Null & r) const { return false; }
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bool operator() (const Array & l, const UInt64 & r) const { return false; }
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bool operator() (const Array & l, const Int64 & r) const { return false; }
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bool operator() (const Array & l, const Float64 & r) const { return false; }
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bool operator() (const Array & l, const String & r) const { return false; }
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bool operator() (const Array & l, const Array & r) const { return l < r; }
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bool operator() (const Array & l, const Tuple & r) const { return false; }
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bool operator() (const Tuple & l, const Null & r) const { return false; }
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bool operator() (const Tuple & l, const UInt64 & r) const { return false; }
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bool operator() (const Tuple & l, const Int64 & r) const { return false; }
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bool operator() (const Tuple & l, const Float64 & r) const { return false; }
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bool operator() (const Tuple & l, const String & r) const { return false; }
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bool operator() (const Tuple & l, const Array & r) const { return false; }
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bool operator() (const Tuple & l, const Tuple & r) const { return l < r; }
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};
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}
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