Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/20753#discussion_r173327074 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/CallMethodViaReflection.scala --- @@ -127,6 +128,52 @@ object CallMethodViaReflection { StringType -> Seq(classOf[String]) ) + val typeJavaMapping = Map[DataType, Class[_]]( + BooleanType -> classOf[Boolean], + ByteType -> classOf[Byte], + ShortType -> classOf[Short], + IntegerType -> classOf[Int], + LongType -> classOf[Long], + FloatType -> classOf[Float], + DoubleType -> classOf[Double], + StringType -> classOf[UTF8String], + DateType -> classOf[DateType.InternalType], + TimestampType -> classOf[TimestampType.InternalType], + BinaryType -> classOf[BinaryType.InternalType], + CalendarIntervalType -> classOf[CalendarInterval] + ) + + val typeBoxedJavaMapping = Map[DataType, Class[_]]( + BooleanType -> classOf[java.lang.Boolean], + ByteType -> classOf[java.lang.Byte], + ShortType -> classOf[java.lang.Short], + IntegerType -> classOf[java.lang.Integer], + LongType -> classOf[java.lang.Long], + FloatType -> classOf[java.lang.Float], + DoubleType -> classOf[java.lang.Double], + DateType -> classOf[java.lang.Integer], + TimestampType -> classOf[java.lang.Long] + ) + + def dataTypeJavaClass(dt: DataType): Class[_] = { + dt match { + case _: DecimalType => classOf[Decimal] + case _: StructType => classOf[InternalRow] + case _: ArrayType => classOf[ArrayData] + case _: MapType => classOf[MapData] + case ObjectType(cls) => cls + case _ => typeJavaMapping.getOrElse(dt, classOf[java.lang.Object]) + } + } --- End diff -- The above should be in `CallMethodViaReflection` or `CodeGenerator`?
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