yaooqinn commented on a change in pull request #27876: [SPARK-31119][SQL] Add
interval value support for extract expression as extract source
URL: https://github.com/apache/spark/pull/27876#discussion_r391445120
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
##########
@@ -2038,32 +2038,60 @@ case class Epoch(child: Expression, timeZoneId:
Option[String] = None)
object DatePart {
- def parseExtractField(
- extractField: String,
- source: Expression,
- errorHandleFunc: => Nothing): Expression =
extractField.toUpperCase(Locale.ROOT) match {
- case "MILLENNIUM" | "MILLENNIA" | "MIL" | "MILS" => Millennium(source)
- case "CENTURY" | "CENTURIES" | "C" | "CENT" => Century(source)
- case "DECADE" | "DECADES" | "DEC" | "DECS" => Decade(source)
- case "YEAR" | "Y" | "YEARS" | "YR" | "YRS" => Year(source)
- case "ISOYEAR" => IsoYear(source)
- case "QUARTER" | "QTR" => Quarter(source)
- case "MONTH" | "MON" | "MONS" | "MONTHS" => Month(source)
- case "WEEK" | "W" | "WEEKS" => WeekOfYear(source)
- case "DAY" | "D" | "DAYS" => DayOfMonth(source)
- case "DAYOFWEEK" => DayOfWeek(source)
- case "DOW" => Subtract(DayOfWeek(source), Literal(1))
- case "ISODOW" => Add(WeekDay(source), Literal(1))
- case "DOY" => DayOfYear(source)
- case "HOUR" | "H" | "HOURS" | "HR" | "HRS" => Hour(source)
- case "MINUTE" | "M" | "MIN" | "MINS" | "MINUTES" => Minute(source)
- case "SECOND" | "S" | "SEC" | "SECONDS" | "SECS" =>
SecondWithFraction(source)
- case "MILLISECONDS" | "MSEC" | "MSECS" | "MILLISECON" | "MSECONDS" | "MS"
=>
- Milliseconds(source)
- case "MICROSECONDS" | "USEC" | "USECS" | "USECONDS" | "MICROSECON" | "US"
=>
- Microseconds(source)
- case "EPOCH" => Epoch(source)
- case _ => errorHandleFunc
+ def parseExtractField(extractField: String, source: Expression): Expression
= {
+ val ef = extractField
+ val dt = source.dataType
+ (dt, ef) match {
+ case (_, null) => Literal(null, DoubleType)
Review comment:
no, extract(null..) will fail in Parser, will not produce a null result.
checked with pg.
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