Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20024#discussion_r159579422
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -608,6 +723,22 @@ 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, $tz));"""
+ case ar: ArrayType =>
+ val bufferClass = classOf[StringBuffer].getName
+ val buffer = ctx.addMutableState(bufferClass, "buffer", v => s"$v
= new $bufferClass();")
--- End diff --
ok
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