dongjoon-hyun 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_r324384947
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
##########
@@ -589,22 +593,41 @@ 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
+ Some(TimestampFormatter(
+ format,
+ DateTimeUtils.getZoneId(timeZoneId),
+ Locale.US))
Review comment:
If there is no other reasons, shall we use a single line instead of four
lines?
```scala
Some(TimestampFormatter(format, DateTimeUtils.getZoneId(timeZoneId)))
```
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