Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14207
> when the data/files are changed by external system (e.g., appended by a
streaming system), the stored schema can be inconsistent with the actual schema
of the data.
I think this problem already exists, as we will use cached schema instead
of inferring it everytime. The only difference is after reboot, this PR will
still use the stored schema, and require users to refresh table manually.
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