mirror of
https://github.com/ClickHouse/ClickHouse.git
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ed5b521110
* Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2].
318 lines
15 KiB
C++
318 lines
15 KiB
C++
#pragma once
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#include <DB/Core/Field.h>
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#include <common/DateLUT.h>
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class SipHash;
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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 (and its descendants) - class with overloaded operator() for all types of fields.
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* You could call visitor for field using function 'applyVisitor'.
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* Also "binary visitor" is supported - its operator() takes two arguments.
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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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/// F is template parameter, to allow universal reference for field, that is useful for const and non-const values.
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template <typename Visitor, typename F>
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typename std::decay<Visitor>::type::ResultType applyVisitor(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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template <typename Visitor, typename F1, typename F2>
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static typename std::decay<Visitor>::type::ResultType applyBinaryVisitorImpl(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 std::decay<Visitor>::type::ResultType applyVisitor(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:
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return applyBinaryVisitorImpl(
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std::forward<Visitor>(visitor), field1.template get<Null>(), std::forward<F2>(field2));
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case Field::Types::UInt64:
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return applyBinaryVisitorImpl(
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std::forward<Visitor>(visitor), field1.template get<UInt64>(), std::forward<F2>(field2));
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case Field::Types::Int64:
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return applyBinaryVisitorImpl(
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std::forward<Visitor>(visitor), field1.template get<Int64>(), std::forward<F2>(field2));
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case Field::Types::Float64:
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return applyBinaryVisitorImpl(
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std::forward<Visitor>(visitor), field1.template get<Float64>(), std::forward<F2>(field2));
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case Field::Types::String:
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return applyBinaryVisitorImpl(
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std::forward<Visitor>(visitor), field1.template get<String>(), std::forward<F2>(field2));
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case Field::Types::Array:
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return applyBinaryVisitorImpl(
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std::forward<Visitor>(visitor), field1.template get<Array>(), std::forward<F2>(field2));
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case Field::Types::Tuple:
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return applyBinaryVisitorImpl(
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std::forward<Visitor>(visitor), field1.template get<Tuple>(), std::forward<F2>(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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/** Prints Field as literal in SQL query */
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class FieldVisitorToString : public StaticVisitor<String>
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{
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public:
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String operator() (const Null & x) const;
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String operator() (const UInt64 & x) const;
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String operator() (const Int64 & x) const;
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String operator() (const Float64 & x) const;
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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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/** Print readable and unique text dump of field type and value. */
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class FieldVisitorDump : public StaticVisitor<String>
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{
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public:
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String operator() (const Null & x) const;
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String operator() (const UInt64 & x) const;
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String operator() (const Int64 & x) const;
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String operator() (const Float64 & x) const;
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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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/** Converts numberic value of any type to specified type. */
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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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/** Updates SipHash by type and value of Field */
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class FieldVisitorHash : public StaticVisitor<>
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{
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private:
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SipHash & hash;
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public:
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FieldVisitorHash(SipHash & hash);
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void operator() (const Null & x) const;
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void operator() (const UInt64 & x) const;
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void operator() (const Int64 & x) const;
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void operator() (const Float64 & x) const;
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void operator() (const String & x) const;
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void operator() (const Array & x) const;
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};
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/// Converts string with date or datetime (in format 'YYYY-MM-DD hh:mm:ss') to UInt64 containing numeric value of date (or datetime)
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UInt64 stringToDateOrDateTime(const String & s);
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/// Converts string with date to UInt16 (which is alias of DayNum_t) containing numeric value of date
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DayNum_t stringToDate(const String & s);
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/// Converts string with date to UInt64 containing numeric value of datetime
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UInt64 stringToDateTime(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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