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From cloud-fan <...@git.apache.org>
Subject [GitHub] spark pull request #21103: [SPARK-23915][SQL] Add array_except function
Date Fri, 27 Jul 2018 04:54:51 GMT
Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21103#discussion_r205667881
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
    @@ -3805,3 +3799,233 @@ object ArrayUnion {
         new GenericArrayData(arrayBuffer)
       }
     }
    +
    +/**
    + * Returns an array of the elements in the intersect of x and y, without duplicates
    + */
    +@ExpressionDescription(
    +  usage = """
    +  _FUNC_(array1, array2) - Returns an array of the elements in array1 but not in array2,
    +    without duplicates.
    +  """,
    +  examples = """
    +    Examples:
    +      > SELECT _FUNC_(array(1, 2, 3), array(1, 3, 5));
    +       array(2)
    +  """,
    +  since = "2.4.0")
    +case class ArrayExcept(left: Expression, right: Expression) extends ArraySetLike {
    --- End diff --
    
    does this need to extend `ComplexTypeMergingExpression`?


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