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https://issues.apache.org/jira/browse/SPARK-31880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17133887#comment-17133887
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Hyukjin Kwon commented on SPARK-31880:
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Okay, thanks for clarification. Let's be diligent on updating JIRA for
trackability.
> Adjacent value parsing not supported for Localized Patterns because of JDK bug
> ------------------------------------------------------------------------------
>
> Key: SPARK-31880
> URL: https://issues.apache.org/jira/browse/SPARK-31880
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0, 3.1.0
> Reporter: Kent Yao
> Priority: Major
>
> {code:java}
> spark-sql> set spark.sql.legacy.timeParserPolicy=exception;
> spark.sql.legacy.timeParserPolicy exception
> spark-sql> select to_timestamp('202011', 'YYYYww');
> {code}
> {code:java}
> Caused by: java.time.format.DateTimeParseException: Text '202011' could not
> be parsed at index 0
> at
> java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949)
> at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1777)
> at
> org.apache.spark.sql.catalyst.util.Iso8601TimestampFormatter.$anonfun$parse$1(TimestampFormatter.scala:79)
> ... 99 more
> {code}
> {code:java}
> spark-sql> set spark.sql.legacy.timeParserPolicy=legacy;
> spark.sql.legacy.timeParserPolicy legacy
> spark-sql> select to_timestamp('202011', 'YYYYwu');
> 2019-12-30 00:00:00
> spark-sql> select to_timestamp('202011', 'YYYYww');
> 2020-03-08 00:00:00
> {code}
> The result could vary between different JDKs
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