Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21028#discussion_r184844407
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -19,14 +19,41 @@ 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}
+/**
+ * Base trait for [[BinaryExpression]]s with two arrays of the same
element type and implicit
+ * casting.
+ */
+trait BinaryArrayExpressionWithImplicitCast extends BinaryExpression
--- End diff --
@kiszk you are not wrong, but `Concat` is a very specific case, since it
supports also `String`s and `Binary`s, so it would anyway require a specific
implementation.
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