Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/20024#discussion_r159681507 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala --- @@ -597,6 +619,44 @@ case class Cast(child: Expression, dataType: DataType, timeZoneId: Option[String """ } + private[this] def codegenWriteArrayElemCode(et: DataType, ctx: CodegenContext): String = { --- End diff -- oh wait, the returned function is only called once, I think we don't need to make it a function, but just return the code, e.g. ``` def writeArrayToStringBuilder(ctx: CodegenContext, et: DataType, arr: String, builder: String): String ```
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