Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14148
It's easy to infer the schema once when we create the table and store it
into external catalog. However, it's a breaking change which means users can't
change the underlying data file schema after the table is created. It's a bad
design we need to fix, but we also need to go through the code path to make
sure we don't break other things.
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