Github user mallman commented on the issue:
https://github.com/apache/spark/pull/15998
> where is the speed-up come from? Is it because the hive API
getPartitionNames is faster than getPartitions? Or is it because we generate
the partition string(a=1/b=2/c=3) at hive side and it's faster than Spark?
To answer `getPartitionNames`, Hive does a simple `SELECT` on a table in
the metastore. It doesn't not transform the resultsâthe partition names are
in a column in that table. That's where the speed up comes from.
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