Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/17777#discussion_r113586201 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala --- @@ -165,6 +165,22 @@ case class Cast(child: Expression, dataType: DataType, timeZoneId: Option[String override def withTimeZone(timeZoneId: String): TimeZoneAwareExpression = copy(timeZoneId = Option(timeZoneId)) + // When this cast involves TimeZone, it's only resolved if the timeZoneId is set; + // Otherwise behavior like Expression.resolved. --- End diff -- Nit: `behavior like` -> `the behavior is like`
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