DataFrame should provide ability to load/save to csv columns of user defined types

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DataFrame should provide ability to load/save to csv columns of user defined types #6859

Open asmirnov82 opened 11 months ago

asmirnov82 commented 11 months ago

DataFrame allows to define PrimitiveDataFrameColumn, where UserType is userdefined structure. Ability to load/save dataframe with such columns from/to csv files is required