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https://issues.apache.org/jira/browse/SPARK-31174?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-31174.
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Resolution: Cannot Reproduce
> unix_timestamp() function returning NULL values for corner cases (daylight
> saving)
> ----------------------------------------------------------------------------------
>
> Key: SPARK-31174
> URL: https://issues.apache.org/jira/browse/SPARK-31174
> Project: Spark
> Issue Type: Bug
> Components: Spark Shell, SQL
> Affects Versions: 2.3.4
> Reporter: Piotr Skąpski
> Priority: Minor
>
> Running below code does not return 4 values due to one timestamp not being
> correctly created (possible problem with daylight saving):
> {code:java}
> spark.sql("""SELECT from_unixtime(unix_timestamp('2020-03-08 01:00:00'),
> 'yyyyMMdd') t1, from_unixtime(unix_timestamp('2020-03-08 02:00:00'),
> 'yyyyMMdd') t2, from_unixtime(unix_timestamp('2020-03-08 03:00:00'),
> 'yyyyMMdd') t3, from_unixtime(unix_timestamp('2020-03-08 04:00:00'),
> 'yyyyMMdd') t4""").show
> +--------+----+--------+--------+
> | t1| t2| t3| t4|
> +--------+----+--------+--------+
> |20200308|null|20200308|20200308|
> +--------+----+--------+--------+{code}
> This unexpected NULL value caused us problems as we did not expect it.
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