question: public static ValueCompressonHolder . UnCompressValue unCompressNone ( DataType compDataType , DataType actualDataType ) { if ( actualDataType == DataType . DATA_BIGINT ) { return new UnCompressDefaultLong ( ) ; } else { switch ( compDataType ) { case DATA_BYTE : return new UnCompressNoneByte ( ) ; case DATA_SHORT : return new UnCompressNoneShort ( ) ; case DATA_INT : return new UnCompressNoneInt ( ) ; case DATA_LONG : return new UnCompressNoneLong ( ) ; case DATA_FLOAT : return new UnCompressNoneFloat ( ) ; default : return new UnCompressNoneDefault ( ) ; } } }
target:  uncompress data for example: int -> double