Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/6876#discussion_r32799457
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/InternalRow.scala ---
    @@ -26,7 +26,67 @@ import 
org.apache.spark.sql.catalyst.expressions.GenericRow
      */
     abstract class InternalRow extends Row {
       // A default implementation to change the return type
    -  override def copy(): InternalRow = {this}
    +  override def copy(): InternalRow = this
    +
    +  override def equals(o: Any): Boolean = {
    +    if (!o.isInstanceOf[Row]) {
    +      return false
    +    }
    +
    +    val other = o.asInstanceOf[Row]
    +    if (length != other.length) {
    +      return false
    +    }
    +
    +    for (i <- 0 until length) {
    +      if (isNullAt(i) != other.isNullAt(i)) {
    +        return false
    +      }
    +      if (!isNullAt(i)) {
    +        val o1 = apply(i)
    +        val o2 = other.apply(i)
    +        if (o1.isInstanceOf[Array[Byte]]) {
    +          // handle equality of Array[Byte]
    +          val b1 = o1.asInstanceOf[Array[Byte]]
    +          if (!o2.isInstanceOf[Array[Byte]] ||
    +            !java.util.Arrays.equals(b1, o2.asInstanceOf[Array[Byte]])) {
    +            return false
    +          }
    +        } else if (o1 != o2) {
    +          return false
    +        }
    --- End diff --
    
    what about
    ```scala
    (o1, o2) match {
      case (b1: Array[Byte], b2: Array[Byte]) => java.util.Arrays.equals(b1, b2)
      case _ => o1 == o2
    }
    ```


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