Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/17777#discussion_r113585647 --- 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. + override lazy val resolved: Boolean = + childrenResolved && checkInputDataTypes().isSuccess && + (!needsTimeZone() || timeZoneId.isDefined) + + private[this] def needsTimeZone(): Boolean = --- End diff -- Nit: `needsTimeZone()` -> `needsTimeZone`
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