cloud-fan commented on a change in pull request #27707: [SPARK-30958][SQL] do
not set default era for DateTimeFormatter
URL: https://github.com/apache/spark/pull/27707#discussion_r384908202
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeFormatterHelper.scala
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@@ -20,26 +20,26 @@ package org.apache.spark.sql.catalyst.util
import java.time._
import java.time.chrono.IsoChronology
import java.time.format.{DateTimeFormatter, DateTimeFormatterBuilder,
ResolverStyle}
-import java.time.temporal.{ChronoField, TemporalAccessor, TemporalQueries}
+import java.time.temporal.{ChronoField, TemporalAccessor}
+import java.time.temporal.ChronoField.{DAY_OF_MONTH, ERA, MONTH_OF_YEAR, YEAR,
YEAR_OF_ERA}
import java.util.Locale
import com.google.common.cache.CacheBuilder
-import org.apache.spark.sql.catalyst.util.DateTimeFormatterHelper._
-
trait DateTimeFormatterHelper {
- // Converts the parsed temporal object to ZonedDateTime. It sets time
components to zeros
- // if they does not exist in the parsed object.
- protected def toZonedDateTime(
- temporalAccessor: TemporalAccessor,
- zoneId: ZoneId): ZonedDateTime = {
- // Parsed input might not have time related part. In that case, time
component is set to zeros.
- val parsedLocalTime = temporalAccessor.query(TemporalQueries.localTime)
- val localTime = if (parsedLocalTime == null) LocalTime.MIDNIGHT else
parsedLocalTime
- // Parsed input must have date component. At least, year must present in
temporalAccessor.
- val localDate = temporalAccessor.query(TemporalQueries.localDate)
+ import DateTimeFormatterHelper._
- ZonedDateTime.of(localDate, localTime, zoneId)
+ protected def getLocalDate(str: String, parsed: TemporalAccessor): LocalDate
= {
+ val year = if (parsed.isSupported(YEAR)) {
+ parsed.get(YEAR)
+ } else if (parsed.isSupported(YEAR_OF_ERA) && !parsed.isSupported(ERA)) {
+ // This can happen when the year pattern is "yyyy" without "G" to
specify era. We assume the
+ // era is AC, and just treat YEAR_OF_ERA as YEAR.
+ parsed.get(YEAR_OF_ERA)
+ } else {
+ throw new DateTimeException("Cannot obtain year from timestamp string "
+ str)
+ }
+ LocalDate.of(year, parsed.get(MONTH_OF_YEAR), parsed.get(DAY_OF_MONTH))
Review comment:
The main change is here: instead of doing
`temporalAccessor.query(TemporalQueries.localDate)`, we can get the date fields
manually, then we have a chance to handle the missing era.
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