Github user lw-lin commented on the issue:
https://github.com/apache/spark/pull/14118
This is ready for review.
To summarize, this patch casts user-specified `nullValue`s to `null`s for
all supported types including the string type:
- this fixes the problem where null dates, null timestamps, etc were not
cast to `null` correctly;
- this also casts `nullValue` to `null` for string type, as per @falaki
@HyukjinKwon and many people's comments. But please note, this is a behavior
change from 2.0.0.
@rxin @falaki could you take another look?
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