Github user dilipbiswal commented on the pull request:
https://github.com/apache/spark/pull/10001#issuecomment-159998104
@yhuai Hi Yin, in the discoverPartitions method, we are trying to create
the partition spec and are trying to cast a partition value to the
corresponding user specified schema's column type. In case of null partition
value the following code raises a null poiner exception in row.getString(i).
Cast(Literal.create(row.getString(i), StringType),
userProvidedSchema.fields(i).dataType).eval()
in this fix i am trying to check for null first and create a null literal
of string type as opposed to calling row.getString(). Hope it is okay ..
Please let me know.
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