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https://issues.apache.org/jira/browse/SPARK-12045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15046631#comment-15046631
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Sean Owen commented on SPARK-12045:
-----------------------------------
I'm generally pretty negative on punting on semantics questions with a flag.
You end up having to support *both* semantics everywhere which sounds like a
lot of potential bugs and questions. Or, one behavior becomes de facto
unsupported and the flag is pointless.
> Use joda's DateTime to replace Calendar
> ---------------------------------------
>
> Key: SPARK-12045
> URL: https://issues.apache.org/jira/browse/SPARK-12045
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.5.2
> Reporter: Jeff Zhang
>
> Currently spark use Calendar to build the Date when convert from string to
> Date. But Calendar can not detect the invalid date format (e.g. 2011-02-29).
> Although we can use Calendar.setLenient(false) to enable Calendar to detect
> the invalid date format, but found the error message very confusing. So I
> suggest to use joda's DateTime to replace Calendar.
> Besides that, I found that there's already some format checking logic when
> casting string to date. And if it is invalid format, it would return None. I
> don't think it make sense to just return None without telling users. I think
> by default should just throw exception, and user can set property to allow it
> return None if invalid format.
> {code}
> if (i == 0 && j != 4) {
> // year should have exact four digits
> return None
> }
> {code}
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