Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16090
My main concern is that, in `CreateDataSourceTableCommand`, we call
`DataSource.resolveRelation` to infer the schema and partition columns. At that
time, the table is not created yet, so logically we should not pass a
`CatalogTable` to `DataSource` and create `CatalogFileIndex` inside it, which
looks like a hack.
It seems to me that it's more logical to tweak the `InMemoryFileIndex` to
scan the files lazily, to avoid unnecessary file scan for cases like this one.
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