warriersruthi opened a new pull request #2550:
URL: https://github.com/apache/hive/pull/2550
The query
SELECT from_unixtime(unix_timestamp(cast('1400-01-01' as date)));
was giving wrong results, because the from_unixtime() function was not
considering leap seconds while representing Timestamp (it was using
java.utils.Date).
The Unix_timestamp() already considered this, so in order to get the correct
results for the above query, it was required to change the epoch time in the
from_unixtime() to ZonedDateTime. The required conversion was done with the
help of the Instant class, which represents a moment given the epoch time.
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