Github user mgaido91 commented on a diff in the pull request: https://github.com/apache/spark/pull/21028#discussion_r184741553 --- 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 -- It's possible indeed. Though, as far as I know there is no use case for a function with a different number of children, so I am not sure if it makes sense to generalize it. @cloud-fan @kiszk @ueshin WDYT?
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