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36 lines
1.2 KiB
C++
36 lines
1.2 KiB
C++
#pragma once
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#include <Common/FieldVisitors.h>
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namespace DB
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{
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class IDataType;
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using DataTypePtr = std::shared_ptr<const IDataType>;
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/** For a given Field returns the minimum data type that allows this value to be stored.
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* Note that you still have to convert Field to corresponding data type before inserting to columns
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* (for example, this is necessary to convert elements of Array to common type).
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*/
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class FieldToDataType : public StaticVisitor<DataTypePtr>
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{
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public:
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DataTypePtr operator() (const Null & x) const;
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DataTypePtr operator() (const UInt64 & x) const;
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DataTypePtr operator() (const UInt128 & x) const;
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DataTypePtr operator() (const Int64 & x) const;
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DataTypePtr operator() (const Float64 & x) const;
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DataTypePtr operator() (const String & x) const;
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DataTypePtr operator() (const Array & x) const;
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DataTypePtr operator() (const Tuple & tuple) const;
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DataTypePtr operator() (const DecimalField<Decimal32> & x) const;
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DataTypePtr operator() (const DecimalField<Decimal64> & x) const;
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DataTypePtr operator() (const DecimalField<Decimal128> & x) const;
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DataTypePtr operator() (const AggregateFunctionStateData & x) const;
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};
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}
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