Github user ericl commented on the issue:
https://github.com/apache/spark/pull/15634
Concretely, I propose renaming
```
TableFileCatalog => MetastoreFileIndex
ListingFileCatalog => InMemoryFileIndex
MetadataLogFileCatalog => MetadataLogFileIndex
PrunedTableFileCatalog => PrunedInMemoryFileIndex
```
I think this would make the differences between these classes more clear.
Previously, the name was only loosely tied with their behavior.
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