Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/13758#discussion_r67850981 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/GenericArrayData.scala --- @@ -142,3 +164,415 @@ class GenericArrayData(val array: Array[Any]) extends ArrayData { result } } + +final class GenericIntArrayData(private val primitiveArray: Array[Int]) + extends GenericArrayData(Array.empty) { + override def array(): Array[Any] = primitiveArray.toArray + + override def copy(): ArrayData = new GenericIntArrayData(primitiveArray) + + override def numElements(): Int = primitiveArray.length + + override def isNullAt(ordinal: Int): Boolean = false + override def getInt(ordinal: Int): Int = primitiveArray(ordinal) + override def toIntArray(): Array[Int] = { + val array = new Array[Int](numElements) + System.arraycopy(primitiveArray, 0, array, 0, numElements) + array + } + override def toString(): String = primitiveArray.mkString("[", ",", "]") + + override def equals(o: Any): Boolean = { --- End diff -- Good question about the definition of equality. Interestingly, there is no ```hashCode()``` and ```equals()``` methods in [UnsafeArrayData](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeArrayData.java). During my works regarding code generation, I cannot find any usage of ```hashCode()``` and ```equals()``` methods. Is it better to drop these two methods if all of the tests would pass without these two methods?
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