cloud-fan commented on a change in pull request #27537:
[SPARK-30668][SQL][FOLLOWUP] Raise exception instead of silent change for new
DateFormatter
URL: https://github.com/apache/spark/pull/27537#discussion_r387601052
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeFormatterHelper.scala
##########
@@ -57,6 +60,27 @@ trait DateTimeFormatterHelper {
}
formatter
}
+
+ // When legacy time parser policy set to EXCEPTION, check whether we will
get different results
+ // between legacy format and new format. For legacy parser,
DateTimeParseException will not be
+ // thrown. On the contrary, if the legacy policy set to CORRECTED,
DateTimeParseException will
+ // address by the caller side.
+ protected def checkDiffResult[T](
+ s: String, legacyParseFunc: String => T): PartialFunction[Throwable, T]
= {
+ case e: DateTimeParseException if SQLConf.get.legacyTimeParserPolicy ==
EXCEPTION =>
+ val res = try {
+ Some(legacyParseFunc(s))
+ } catch {
+ case _: Throwable => None
+ }
+ if (res.nonEmpty) {
+ throw new SparkUpgradeException("3.0", s"Set
${SQLConf.LEGACY_TIME_PARSER_POLICY.key} to " +
Review comment:
We should explain what happened.
`Fail to parse '$s' in the new parser. You can set ... to LEGACY to restore
..., or set it to CORRECTED and treat it as an invalid datetime string.`
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