maropu 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_r324204543
##########
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
Review comment:
can we do it like this?
```
lazy val formatter = if (right.foldable) {
val fmt = right.eval().toString
val formatter = TimestampFormatter(fmt, zoneId, Locale.US)
(fmt: Any) => formatter
} else {
(fmt: Any) => TimestampFormatter(fmt.toString, zoneId, Locale.US)
}
override protected def nullSafeEval(timestamp: Any, format: Any): Any = {
UTF8String.fromString(formatter(format).format(timestamp.asInstanceOf[Long]))
}
```
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