alamb opened a new pull request, #18229:
URL: https://github.com/apache/datafusion/pull/18229

   ## Which issue does this PR close?
   
   
   - Part of  https://github.com/apache/datafusion/pull/18160
   - Builds on https://github.com/apache/datafusion/pull/18226
   
   
   TODO:
   - [ ] pull out error message improvements to a separate PR
   
   
   ## Rationale for this change
   
   As we spend more effort optimizing the number of IO requests made during 
various scenarios, we need to ensure we have test coverage to:
   1. Verify that the optimizations are working as intended
   2. Prevent regressions in the future as code changes are made
   
   ## What changes are included in this PR?
   
   
   Changes:
   Add a new integration test that verifies what IO operations happen
   when doing various operations
   
   
   1. Create a listing table backed by a single CSV file
   2. Create a listing table backed by multiple CSV files
   1. Creating a listing table backed by a single parquet file
   2. Create a listing table backed by multiple parquet files
   3. Run queries against those table, both with and without filters
   
   ## Are these changes tested?
   
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   2. Serve as another way to document the expected behavior of the code
   
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   ## Are there any user-facing changes?
   
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