Github user rxin commented on the issue:
https://github.com/apache/spark/pull/14148
Thanks. Just FYI when you make future changes, when a table is added to the
catalog (regardless whether it is temporary, non-temp, external, internal), we
should save its schema. We should not rely on schema inference every time the
user runs a query, and the schema should not change depending on time or the
underlying data. For tables in the catalog, schema should be specified by the
user. It is OK as a convenience measure for user to rely on schema inference
during table creation, but it is not OK to rely on schema inference every time.
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