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https://issues.apache.org/jira/browse/SPARK-17914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15572758#comment-15572758
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Oksana Romankova commented on SPARK-17914:
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You are correct. It is related to what has been proposed in SPARK-14428.
However, current behavior is defective. If SPARK-14428 is not going to be
approved to be supported, then at least the defect deserves consideration to
be addressed.
> Spark SQL casting to TimestampType with nanosecond results in incorrect
> timestamp
> ---------------------------------------------------------------------------------
>
> Key: SPARK-17914
> URL: https://issues.apache.org/jira/browse/SPARK-17914
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.1
> Reporter: Oksana Romankova
>
> In some cases when timestamps contain nanoseconds they will be parsed
> incorrectly.
> Examples:
> "2016-05-14T15:12:14.0034567Z" -> "2016-05-14 15:12:14.034567"
> "2016-05-14T15:12:14.000345678Z" -> "2016-05-14 15:12:14.345678"
> The issue seems to be happening in DateTimeUtils.stringToTimestamp(). It
> assumes that only 6 digit fraction of a second will be passed.
> With this being the case I would suggest either discarding nanoseconds
> automatically, or throw an exception prompting to pre-format timestamps to
> microsecond precision first before casting to the Timestamp.
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