Jeff Zhang created SPARK-12045:
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Summary: 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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