Github user httfighter commented on the issue:
https://github.com/apache/spark/pull/19380
In RDMS , unix_timestamp method can keep the milliseconds. For example,
execute the command as follows
select unix_timestamp("2017-10-10 10:10:20.111") from test;
you can get the resultï¼ 1490667020.111
But the native unix_timestamp method of Spark will be lost milliseconds, we
want to keep the milliseconds.
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