xudong963 opened a new issue, #15889:
URL: https://github.com/apache/datafusion/issues/15889
I think using the default schema mapper makes sense for now /
in this PR, but in general I think it would make sense to allow the user to
provide their own schema mapping rules here (so a default value that is not
`NULL` can be used, for example) via their own mapper.
However, we woudl have to add a schema mapper factory to `ListingOptions`
https://github.com/apache/datafusion/blob/f1bbb1d636650c7f28f52dc507f36e64d71e1aa8/datafusion/core/src/datasource/listing/table.rs#L256-L255
(this is not a change needed for this PR, I just noticed it while reviewing
this PR)
_Originally posted by @alamb in
https://github.com/apache/datafusion/pull/15865#discussion_r2065156402_
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