Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/20024#discussion_r159589454 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala --- @@ -608,6 +667,20 @@ case class Cast(child: Expression, dataType: DataType, timeZoneId: Option[String val tz = ctx.addReferenceObj("timeZone", timeZone) (c, evPrim, evNull) => s"""$evPrim = UTF8String.fromString( org.apache.spark.sql.catalyst.util.DateTimeUtils.timestampToString($c, $tz));""" + case ar: ArrayType => + (c, evPrim, evNull) => { + val bufferTerm = ctx.freshName("bufferTerm") + val bufferClass = classOf[StringBuffer].getName --- End diff -- Since `StringBuffer` is used in `stringExpressions` and `regexExpressions`, I just used this along with them. But, I'll update. (BTW, any reason to use `StringBuffer` in `stringExpressions` and `regexExpressions`?)
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