Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/8026#issuecomment-128643963
A summary of my offline discussion with @chenghao-intel:
The real problem here is that the partition column types of the newly
refreshed partition spec don't match those in the user specified spec. The
current fix simply disables refreshing partition spec, which is not preferable.
My suggestion is to factor out the [partition values casting part] [1] in the
`partitionSpec` method and reuse it in `refresh()` to cast data types of
partition values and just reuse `partitionColumns` in the user specified
partition spec.
[1]:
https://github.com/apache/spark/blob/ebfd91c542aaead343cb154277fcf9114382fee7/sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala#L460-L473
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