MaxGekk commented on a change in pull request #25708: [SPARK-28141][SQL]
Support special date values
URL: https://github.com/apache/spark/pull/25708#discussion_r322001846
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
##########
@@ -848,4 +852,40 @@ object DateTimeUtils {
val sinceEpoch = BigDecimal(timestamp) / MICROS_PER_SECOND + offset
new Decimal().set(sinceEpoch, 20, 6)
}
+
+ def currentDate(zoneId: ZoneId): SQLDate =
localDateToDays(LocalDate.now(zoneId))
+
+ private val specialDate =
"""(EPOCH|NOW|TODAY|TOMORROW|YESTERDAY)\p{Blank}*(.*)""".r
+ /**
+ * Converts notational shorthands that are converted to ordinary dates.
+ * @param input - left trimmed string
+ * @param zoneId - zone identifier used to get the current date.
+ * @return some of days since the epoch if the conversion completed
successfully otherwise None.
+ */
+ def convertSpecialDate(input: String, zoneId: ZoneId): Option[SQLDate] = {
+ def isValidZoneId(z: String): Boolean = {
+ z == "" || Try { getZoneId(z) }.isSuccess
Review comment:
I don't think the reasons from the style guide are applicable here. And code
looks slightly ugly. Maybe you have better implementation than:
```scala
def isValidZoneId(z: String): Boolean = {
if (z == "") return true
try {
getZoneId(z)
true
} catch {
case NonFatal(_) => false
}
}
```
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