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To Suhail,
It is always a good thing to collect stats on PARTITION for all partitioned tables. It is not used for extrapolation in 14.0, but is important for optimizer decisions when building the query plan. Plus it is a very fast operation, so there is little benefit in dropping it.
The difference in 14.0 is that you no longer need to collect PARTITON on non-partitioned tables.
Thanks, -Carrie