[GitHub] spark pull request #21061: [SPARK-23914][SQL] Add array_union function

[kiszk <gi...@git.apache.org>]

Github user kiszk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21061#discussion_r186283042
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala ---
    @@ -19,13 +19,42 @@ package org.apache.spark.sql.catalyst.expressions
     import java.util.Comparator
     
     import org.apache.spark.sql.catalyst.InternalRow
    -import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
    +import org.apache.spark.sql.catalyst.analysis.{TypeCheckResult, TypeCoercion}
     import org.apache.spark.sql.catalyst.expressions.codegen._
     import org.apache.spark.sql.catalyst.util.{ArrayData, GenericArrayData, MapData, TypeUtils}
     import org.apache.spark.sql.types._
     import org.apache.spark.unsafe.Platform
     import org.apache.spark.unsafe.array.ByteArrayMethods
     import org.apache.spark.unsafe.types.{ByteArray, UTF8String}
    +import org.apache.spark.util.collection.OpenHashSet
    +
    +/**
    --- End diff --
    
    I intentionally copy the implementation from #21028 


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