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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-22364) unix_timestamp function sets valid dates to null
Date Thu, 26 Oct 2017 14:15:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-22364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16220483#comment-16220483
] 

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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