Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16308#discussion_r92962286
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -30,21 +30,44 @@ 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 {
+
+ def zoneId: String
--- End diff --
Yes, I wanted to avoid a bunch of gets.
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