Github user adrian-wang commented on the pull request:
https://github.com/apache/spark/pull/3732#issuecomment-68815238
For oracle's doc about `java.sql.Date`, In
https://docs.oracle.com/javase/6/docs/api/java/sql/Date.html
To conform with the definition of SQL DATE, the millisecond values wrapped
by a java.sql.Date instance must be 'normalized' by setting the hours, minutes,
seconds, and milliseconds to zero in the particular time zone with which the
instance is associated.
For SQL-92 spec, http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt
In page 111,
2) For a <datetime type>,
Case:
a) If DATE is specified, then the data type contains the <date-
time field>s years, months, and days.
The spec also clarifies that the definition is taken from
ISO-8601[http://www.w3.org/TR/NOTE-datetime], in which it says,
Complete date:
YYYY-MM-DD (eg 1997-07-16)
Hence, the time part of `java.sql.Date` is not necessary. I think that
simply results from the inheritance of the same base type, namely
`java.util.Date`, with `java.sql.Timestamp`
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