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[Parquet Metadata Cache] Document the parquet metadata cache #17048

@alamb

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@alamb

Is your feature request related to a problem or challenge?

DataFusion's built in ListingTable will soon have metadata caching 🎉

I think we should make sure this feature is more discoverable via the docs

Describe the solution you'd like

Add a note to the https://docs.rs/datafusion/latest/datafusion/datasource/listing/struct.ListingTable.html that describes metadata is cached for parquet files

Add a note about the design rationale for simple algorithms, perhaps copying the text her

Describe alternatives you've considered

No response

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