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https://issues.apache.org/jira/browse/SPARK-22364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16220483#comment-16220483
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Sean Owen commented on SPARK-22364:
-----------------------------------
Is the problem that this hour doesn't exist in the timezone because it's the
hour that is skipped when the clocks move forwards?
See https://stackoverflow.com/questions/14201469/java-date-and-daylight-saving
which actually talks about the exact same date.
> unix_timestamp function sets valid dates to null
> ------------------------------------------------
>
> Key: SPARK-22364
> URL: https://issues.apache.org/jira/browse/SPARK-22364
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Environment: Windows 10, United Kingdom
> Reporter: Matthew Sinton-Hewitt
>
> org.apache.spark.sql.functions.unix_timestamp sets some valid dates to null.
> The dates happen to be the at the start of Daylight Savings time (UK and
> possibly elsewhere).
> {code:java}
> val spark = SparkSession.builder.getOrCreate()
> import spark.implicits._
> spark.sparkContext.parallelize(
> Seq("25/03/2012 00:59", "25/03/2012 01:00", "25/03/2012 01:59",
> "25/03/2012 02:01"))
> .toDF("date")
> .select(unix_timestamp($"date", "dd/MM/yyyy HH:mm"))
> .show(false)
> // results:
> // 1332637140, null, null, 1332637260
> {code}
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