progval opened a new issue, #12592:
URL: https://github.com/apache/datafusion/issues/12592

   ### Is your feature request related to a problem or challenge?
   
   This allows users to implement #12547 (caching metadata, especially the Page 
Index) themselves without reimplementing all of `ParquetOpener` and 
`ParquetExec`
   
   ### Describe the solution you'd like
   
   Add a method to the object returned by `ParquetFileReaderFactory` that loads 
metadata, so that users who overwrite the `DefaultParquerFileReaderFactory` 
with `SessionState::register_file_format(..., true)` can provide their own 
implementation.
   
   ### Describe alternatives you've considered
   
   Adding caching support directly in Datafusion. I tried in #12548 but it went 
nowhere.
   
   Support for caching directly in Datafusion can be added later, based on this 
feature.
   
   ### Additional context
   
   _No response_


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