srowen 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_r324184657
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
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@@ -589,22 +589,43 @@ case class DateFormatClass(left: Expression, right:
Expression, timeZoneId: Opti
override def inputTypes: Seq[AbstractDataType] = Seq(TimestampType,
StringType)
- override def withTimeZone(timeZoneId: String): TimeZoneAwareExpression =
+ var formatter: Option[TimestampFormatter] = None
+
+ override def withTimeZone(timeZoneId: String): TimeZoneAwareExpression = {
+ if (formatter.isEmpty && right.foldable) {
+ val format = right.eval().toString
+ formatter = Some(TimestampFormatter(
+ format,
+ DateTimeUtils.getZoneId(timeZoneId),
+ Locale.US))
+ }
copy(timeZoneId = Option(timeZoneId))
+ }
override protected def nullSafeEval(timestamp: Any, format: Any): Any = {
- val df = TimestampFormatter(format.toString, zoneId)
- UTF8String.fromString(df.format(timestamp.asInstanceOf[Long]))
+ val tf = if (formatter.isEmpty) {
Review comment:
How about `.getOrElse`?
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