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request?\r\n\r\nAPI: (to be discussed), use 2-args as example:\r\n\r\n```\r\nUDFRegistration\r\n  // scala version\r\n  def registerV2(name: String, func: Function2[_, _, _], returnType: DataType,\r\n      input1Type: DataType, input2Type: DataType, nullable: Boolean, deterministic: Boolean):UserDefinedFunctionV2\r\n  // java version\r\n  def registerV2j(name: String, f: UDF2[_, _, _], returnType: DataType,\r\n    input1Type: DataType, input2Type: DataType, nullable: Boolean, deterministic: Boolean):UserDefinedFunctionV2\r\n```\r\n\r\n## How was this patch tested?\r\n\r\nTwo simple testcase added.\r\nOthers will add 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