Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19598
LGTM
BTW, now, more and more optimization are added based on the NULLable
property in schema. Normally, the database enforces null checking during
inserting/updating the data, but we do not enforce it because the data is not
managed by us. If the users provide wrong nullable info in the schema. This
might be harder for us to debug these runtime issues.
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