mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-30 05:30:51 +00:00
453 lines
18 KiB
C++
453 lines
18 KiB
C++
#pragma once
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#include <Core/Field.h>
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#include <Core/AccurateComparison.h>
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#include <common/demangle.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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extern const int BAD_TYPE_OF_FIELD;
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extern const int LOGICAL_ERROR;
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}
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wredundant-decls"
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// Just dont mess with it. If the redundant redeclaration is removed then ReaderHelpers.h should be included.
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// This leads to Arena.h inclusion which has a problem with ASAN stuff included properly and messing macro definition
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// which intefrers with... You dont want to know, really.
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UInt128 stringToUUID(const String & str);
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#pragma GCC diagnostic pop
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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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auto applyVisitor(Visitor && visitor, F && field)
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{
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return Field::dispatch(visitor, field);
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}
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template <typename Visitor, typename F1, typename F2>
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auto applyVisitor(Visitor && visitor, F1 && field1, F2 && field2)
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{
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return Field::dispatch([&](auto & field1_value)
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{
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return Field::dispatch([&](auto & field2_value)
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{
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return visitor(field1_value, field2_value);
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},
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field2);
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},
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field1);
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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 UInt128 & 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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String operator() (const DecimalField<Decimal32> & x) const;
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String operator() (const DecimalField<Decimal64> & x) const;
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String operator() (const DecimalField<Decimal128> & x) const;
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String operator() (const AggregateFunctionStateData & 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 UInt128 & 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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String operator() (const DecimalField<Decimal32> & x) const;
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String operator() (const DecimalField<Decimal64> & x) const;
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String operator() (const DecimalField<Decimal128> & x) const;
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String operator() (const AggregateFunctionStateData & 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 &) const
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{
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throw Exception("Cannot convert NULL to " + demangle(typeid(T).name()), ErrorCodes::CANNOT_CONVERT_TYPE);
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}
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T operator() (const String &) const
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{
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throw Exception("Cannot convert String to " + demangle(typeid(T).name()), ErrorCodes::CANNOT_CONVERT_TYPE);
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}
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T operator() (const Array &) const
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{
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throw Exception("Cannot convert Array to " + demangle(typeid(T).name()), ErrorCodes::CANNOT_CONVERT_TYPE);
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}
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T operator() (const Tuple &) const
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{
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throw Exception("Cannot convert Tuple to " + demangle(typeid(T).name()), 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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T operator() (const UInt128 &) const
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{
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throw Exception("Cannot convert UInt128 to " + demangle(typeid(T).name()), ErrorCodes::CANNOT_CONVERT_TYPE);
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}
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template <typename U>
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T operator() (const DecimalField<U> & x) const
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{
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if constexpr (std::is_floating_point_v<T>)
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return static_cast<T>(x.getValue()) / x.getScaleMultiplier();
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else
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return x.getValue() / x.getScaleMultiplier();
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}
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T operator() (const AggregateFunctionStateData &) const
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{
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throw Exception("Cannot convert AggregateFunctionStateData to " + demangle(typeid(T).name()), ErrorCodes::CANNOT_CONVERT_TYPE);
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}
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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 UInt128 & 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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void operator() (const Tuple & x) const;
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void operator() (const DecimalField<Decimal32> & x) const;
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void operator() (const DecimalField<Decimal64> & x) const;
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void operator() (const DecimalField<Decimal128> & x) const;
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void operator() (const AggregateFunctionStateData & x) const;
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};
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template <typename T> constexpr bool isDecimalField() { return false; }
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template <> constexpr bool isDecimalField<DecimalField<Decimal32>>() { return true; }
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template <> constexpr bool isDecimalField<DecimalField<Decimal64>>() { return true; }
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template <> constexpr bool isDecimalField<DecimalField<Decimal128>>() { return true; }
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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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*/
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class FieldVisitorAccurateEquals : public StaticVisitor<bool>
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{
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public:
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bool operator() (const UInt64 &, const Null &) 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 UInt128 & r) const { return cantCompare(l, r); }
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bool operator() (const UInt64 & l, const Int64 & r) const { return accurate::equalsOp(l, r); }
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bool operator() (const UInt64 & l, const Float64 & r) const { return accurate::equalsOp(l, r); }
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bool operator() (const UInt64 & l, const String & r) const { return cantCompare(l, r); }
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bool operator() (const UInt64 & l, const Array & r) const { return cantCompare(l, r); }
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bool operator() (const UInt64 & l, const Tuple & r) const { return cantCompare(l, r); }
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bool operator() (const UInt64 & l, const AggregateFunctionStateData & r) const { return cantCompare(l, r); }
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bool operator() (const Int64 &, const Null &) const { return false; }
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bool operator() (const Int64 & l, const UInt64 & r) const { return accurate::equalsOp(l, r); }
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bool operator() (const Int64 & l, const UInt128 & r) const { return cantCompare(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 accurate::equalsOp(l, r); }
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bool operator() (const Int64 & l, const String & r) const { return cantCompare(l, r); }
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bool operator() (const Int64 & l, const Array & r) const { return cantCompare(l, r); }
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bool operator() (const Int64 & l, const Tuple & r) const { return cantCompare(l, r); }
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bool operator() (const Int64 & l, const AggregateFunctionStateData & r) const { return cantCompare(l, r); }
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bool operator() (const Float64 &, const Null &) const { return false; }
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bool operator() (const Float64 & l, const UInt64 & r) const { return accurate::equalsOp(l, r); }
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bool operator() (const Float64 & l, const UInt128 & r) const { return cantCompare(l, r); }
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bool operator() (const Float64 & l, const Int64 & r) const { return accurate::equalsOp(l, 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 cantCompare(l, r); }
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bool operator() (const Float64 & l, const Array & r) const { return cantCompare(l, r); }
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bool operator() (const Float64 & l, const Tuple & r) const { return cantCompare(l, r); }
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bool operator() (const Float64 & l, const AggregateFunctionStateData & r) const { return cantCompare(l, r); }
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template <typename T>
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bool operator() (const Null &, const T &) const
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{
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return std::is_same_v<T, Null>;
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}
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template <typename T>
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bool operator() (const String & l, const T & r) const
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{
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if constexpr (std::is_same_v<T, String>)
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return l == r;
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if constexpr (std::is_same_v<T, UInt128>)
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return stringToUUID(l) == r;
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if constexpr (std::is_same_v<T, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T>
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bool operator() (const UInt128 & l, const T & r) const
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{
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if constexpr (std::is_same_v<T, UInt128>)
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return l == r;
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if constexpr (std::is_same_v<T, String>)
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return l == stringToUUID(r);
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if constexpr (std::is_same_v<T, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T>
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bool operator() (const Array & l, const T & r) const
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{
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if constexpr (std::is_same_v<T, Array>)
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return l == r;
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if constexpr (std::is_same_v<T, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T>
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bool operator() (const Tuple & l, const T & r) const
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{
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if constexpr (std::is_same_v<T, Tuple>)
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return l == r;
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if constexpr (std::is_same_v<T, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T, typename U>
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bool operator() (const DecimalField<T> & l, const U & r) const
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{
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if constexpr (isDecimalField<U>())
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return l == r;
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if constexpr (std::is_same_v<U, Int64> || std::is_same_v<U, UInt64>)
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return l == DecimalField<Decimal128>(r, 0);
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if constexpr (std::is_same_v<U, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T> bool operator() (const UInt64 & l, const DecimalField<T> & r) const { return DecimalField<Decimal128>(l, 0) == r; }
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template <typename T> bool operator() (const Int64 & l, const DecimalField<T> & r) const { return DecimalField<Decimal128>(l, 0) == r; }
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template <typename T> bool operator() (const Float64 & l, const DecimalField<T> & r) const { return cantCompare(l, r); }
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template <typename T>
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bool operator() (const AggregateFunctionStateData & l, const T & r) const
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{
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if constexpr (std::is_same_v<T, AggregateFunctionStateData>)
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return l == r;
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return cantCompare(l, r);
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}
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private:
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template <typename T, typename U>
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bool cantCompare(const T &, const U &) const
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{
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if constexpr (std::is_same_v<U, Null>)
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return false;
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throw Exception("Cannot compare " + demangle(typeid(T).name()) + " with " + demangle(typeid(U).name()),
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ErrorCodes::BAD_TYPE_OF_FIELD);
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}
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};
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class FieldVisitorAccurateLess : public StaticVisitor<bool>
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{
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public:
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bool operator() (const UInt64 &, const Null &) 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 UInt128 & r) const { return cantCompare(l, r); }
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bool operator() (const UInt64 & l, const Int64 & r) const { return accurate::lessOp(l, r); }
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bool operator() (const UInt64 & l, const Float64 & r) const { return accurate::lessOp(l, r); }
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bool operator() (const UInt64 & l, const String & r) const { return cantCompare(l, r); }
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bool operator() (const UInt64 & l, const Array & r) const { return cantCompare(l, r); }
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bool operator() (const UInt64 & l, const Tuple & r) const { return cantCompare(l, r); }
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bool operator() (const UInt64 & l, const AggregateFunctionStateData & r) const { return cantCompare(l, r); }
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bool operator() (const Int64 &, const Null &) const { return false; }
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bool operator() (const Int64 & l, const UInt64 & r) const { return accurate::lessOp(l, r); }
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bool operator() (const Int64 & l, const UInt128 & r) const { return cantCompare(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 accurate::lessOp(l, r); }
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bool operator() (const Int64 & l, const String & r) const { return cantCompare(l, r); }
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bool operator() (const Int64 & l, const Array & r) const { return cantCompare(l, r); }
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bool operator() (const Int64 & l, const Tuple & r) const { return cantCompare(l, r); }
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bool operator() (const Int64 & l, const AggregateFunctionStateData & r) const { return cantCompare(l, r); }
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bool operator() (const Float64 &, const Null &) const { return false; }
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bool operator() (const Float64 & l, const UInt64 & r) const { return accurate::lessOp(l, r); }
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bool operator() (const Float64 & l, const UInt128 & r) const { return cantCompare(l, r); }
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bool operator() (const Float64 & l, const Int64 & r) const { return accurate::lessOp(l, 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 cantCompare(l, r); }
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bool operator() (const Float64 & l, const Array & r) const { return cantCompare(l, r); }
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bool operator() (const Float64 & l, const Tuple & r) const { return cantCompare(l, r); }
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bool operator() (const Float64 & l, const AggregateFunctionStateData & r) const { return cantCompare(l, r); }
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template <typename T>
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bool operator() (const Null &, const T &) const
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{
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return !std::is_same_v<T, Null>;
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}
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template <typename T>
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bool operator() (const String & l, const T & r) const
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{
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if constexpr (std::is_same_v<T, String>)
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return l < r;
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if constexpr (std::is_same_v<T, UInt128>)
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return stringToUUID(l) < r;
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if constexpr (std::is_same_v<T, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T>
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bool operator() (const UInt128 & l, const T & r) const
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{
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if constexpr (std::is_same_v<T, UInt128>)
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return l < r;
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if constexpr (std::is_same_v<T, String>)
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return l < stringToUUID(r);
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if constexpr (std::is_same_v<T, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T>
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bool operator() (const Array & l, const T & r) const
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{
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if constexpr (std::is_same_v<T, Array>)
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return l < r;
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if constexpr (std::is_same_v<T, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T>
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bool operator() (const Tuple & l, const T & r) const
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{
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if constexpr (std::is_same_v<T, Tuple>)
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return l < r;
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if constexpr (std::is_same_v<T, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T, typename U>
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bool operator() (const DecimalField<T> & l, const U & r) const
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{
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if constexpr (isDecimalField<U>())
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return l < r;
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if constexpr (std::is_same_v<U, Int64> || std::is_same_v<U, UInt64>)
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return l < DecimalField<Decimal128>(r, 0);
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if constexpr (std::is_same_v<U, Null>)
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return false;
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return cantCompare(l, r);
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}
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template <typename T> bool operator() (const UInt64 & l, const DecimalField<T> & r) const { return DecimalField<Decimal128>(l, 0) < r; }
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template <typename T> bool operator() (const Int64 & l, const DecimalField<T> & r) const { return DecimalField<Decimal128>(l, 0) < r; }
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template <typename T> bool operator() (const Float64 &, const DecimalField<T> &) const { return false; }
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template <typename T>
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bool operator() (const AggregateFunctionStateData & l, const T & r) const
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{
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return cantCompare(l, r);
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}
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private:
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template <typename T, typename U>
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bool cantCompare(const T &, const U &) const
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{
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throw Exception("Cannot compare " + demangle(typeid(T).name()) + " with " + demangle(typeid(U).name()),
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ErrorCodes::BAD_TYPE_OF_FIELD);
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}
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};
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/** Implements `+=` operation.
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* Returns false if the result is zero.
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*/
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class FieldVisitorSum : public StaticVisitor<bool>
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{
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private:
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const Field & rhs;
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public:
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explicit FieldVisitorSum(const Field & rhs_) : rhs(rhs_) {}
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// We can add all ints as unsigned regardless of their actual signedness.
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bool operator() (Int64 & x) const { return this->operator()(reinterpret_cast<UInt64 &>(x)); }
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bool operator() (UInt64 & x) const
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{
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x += rhs.reinterpret<UInt64>();
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return x != 0;
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}
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bool operator() (Float64 & x) const { x += get<Float64>(rhs); return x != 0; }
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bool operator() (Null &) const { throw Exception("Cannot sum Nulls", ErrorCodes::LOGICAL_ERROR); }
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bool operator() (String &) const { throw Exception("Cannot sum Strings", ErrorCodes::LOGICAL_ERROR); }
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bool operator() (Array &) const { throw Exception("Cannot sum Arrays", ErrorCodes::LOGICAL_ERROR); }
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bool operator() (Tuple &) const { throw Exception("Cannot sum Tuples", ErrorCodes::LOGICAL_ERROR); }
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bool operator() (UInt128 &) const { throw Exception("Cannot sum UUIDs", ErrorCodes::LOGICAL_ERROR); }
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bool operator() (AggregateFunctionStateData &) const { throw Exception("Cannot sum AggregateFunctionStates", ErrorCodes::LOGICAL_ERROR); }
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|
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template <typename T>
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bool operator() (DecimalField<T> & x) const
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|
{
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|
x += get<DecimalField<T>>(rhs);
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|
return x.getValue() != 0;
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|
}
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|
};
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}
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