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Copy pathFieldToDataType.h
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56 lines (48 loc) · 2.28 KB
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#pragma once
#include <memory>
#include <Core/Types.h>
#include <Core/Field.h>
#include <Common/FieldVisitors.h>
#include <DataTypes/getLeastSupertype.h>
namespace DB
{
class IDataType;
using DataTypePtr = std::shared_ptr<const IDataType>;
/** For a given Field returns the minimum data type that allows this value to be stored.
* Note that you still have to convert Field to corresponding data type before inserting to columns
* (for example, this is necessary to convert elements of Array to common type).
*/
template <LeastSupertypeOnError on_error = LeastSupertypeOnError::Throw>
class FieldToDataType : public StaticVisitor<DataTypePtr>
{
public:
DataTypePtr operator() (const Null & x) const;
DataTypePtr operator() (const UInt64 & x) const;
DataTypePtr operator() (const UInt128 & x) const;
DataTypePtr operator() (const Int64 & x) const;
DataTypePtr operator() (const Int128 & x) const;
DataTypePtr operator() (const UUID & x) const;
DataTypePtr operator() (const IPv4 & x) const;
DataTypePtr operator() (const IPv6 & x) const;
DataTypePtr operator() (const Float64 & x) const;
DataTypePtr operator() (const String & x) const;
DataTypePtr operator() (const Array & x) const;
DataTypePtr operator() (const Tuple & tuple) const;
DataTypePtr operator() (const Map & map) const;
DataTypePtr operator() (const Object & map) const;
DataTypePtr operator() (const DecimalField<Decimal32> & x) const;
DataTypePtr operator() (const DecimalField<Decimal64> & x) const;
DataTypePtr operator() (const DecimalField<Decimal128> & x) const;
DataTypePtr operator() (const DecimalField<Decimal256> & x) const;
DataTypePtr operator() (const Decimal32 & x, UInt32 scale) const;
DataTypePtr operator() (const Decimal64 & x, UInt32 scale) const;
DataTypePtr operator() (const Decimal128 & x, UInt32 scale) const;
DataTypePtr operator() (const Decimal256 & x, UInt32 scale) const;
DataTypePtr operator() (const AggregateFunctionStateData & x) const;
DataTypePtr operator() (const CustomType & x) const;
DataTypePtr operator() (const UInt256 & x) const;
DataTypePtr operator() (const Int256 & x) const;
DataTypePtr operator() (const bool & x) const;
};
FieldToDataType() -> FieldToDataType<LeastSupertypeOnError::Throw>;
}