Github user mbasmanova commented on the issue:
https://github.com/apache/spark/pull/18421
@wzhfy, @gatorsmile, I updated this PR to support partial partition specs
where values are defined only for a subset of partition columns. For example,
if table has 2 partition columns ds and hr, both PARTITION (ds='2010-01-01',
hr=10) and PARTITION (hr=10) specs are valid. I did not provide support for
partition specs where partition column is mentioned without any value. E.g.
PARTITION (ds, hr=10) spec is still not allowed. I didn't implement this
because I realized that I don't understand why this syntax is useful. My
understanding is that (ds, hr=10) is equivalent to (hr=10). Do you think it is
important to implement this syntax? If so, would you help me understand why? Is
this because we want to support HQL at the same level as Hive to allow seamless
transition from Hive to Spark?
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