Github user ueshin commented on a diff in the pull request: https://github.com/apache/spark/pull/16308#discussion_r95400494 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala --- @@ -30,21 +30,48 @@ import org.apache.spark.sql.types._ import org.apache.spark.unsafe.types.{CalendarInterval, UTF8String} /** + * Common base class for time zone aware expressions. + */ +trait TimeZoneAwareExpression extends Expression { + + /** the timezone ID. */ + def timeZoneId: String + + /** + * Returns true if the timezone ID is resolved. + * If not resolved, the analyzer [[ResolveTimeZone]] will resolve with session local timezone. + */ + def timeZoneResolved: Boolean = timeZoneId != null --- End diff -- I think that there might be a case that we let users explicitly set the timezone id, e.g. adding such functions to `functions.scala`. If so, we can't simply replace the timezone id by session local timezone.
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