HyukjinKwon commented on a change in pull request #25782: [SPARK-29074][SQL]
Optimize `date_format` for foldable `fmt`
URL: https://github.com/apache/spark/pull/25782#discussion_r324488539
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
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@@ -589,22 +593,37 @@ case class DateFormatClass(left: Expression, right:
Expression, timeZoneId: Opti
override def inputTypes: Seq[AbstractDataType] = Seq(TimestampType,
StringType)
- override def withTimeZone(timeZoneId: String): TimeZoneAwareExpression =
- copy(timeZoneId = Option(timeZoneId))
+ override def withTimeZone(timeZoneId: String): TimeZoneAwareExpression = {
+ val tf = if (formatter.isEmpty && right.foldable) {
+ val format = right.eval().toString
Review comment:
@MaxGekk, can `right.eval()` be `null`? It's pretty much a corner case, for
instance, `cast(null as string)` but might better handle it.
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