alamb opened a new pull request, #9218:
URL: https://github.com/apache/arrow-rs/pull/9218

   
   # Which issue does this PR close?
   
   
   - part of https://github.com/apache/arrow-rs/issues/9136 from @Dandandan 
   
   # Rationale for this change
   
   This PR from @Dandandan adds a bunch of (very cool) special casess for 
filtering in the coalescer:
   - https://github.com/apache/arrow-rs/pull/8951
   
   However, these new special cases are not covered by existing tests, so let's 
increase the coverage
   
   
   # What changes are included in this PR?
   
   Add coverage for the following cases
   
   // 1. non-null fast path
   // 2. Empty batches
   // 3. One column (from the batch)
   
   I also added names to the tests as now each test is run in several different 
permutations so I wanted to assist debugging
   
   # Are these changes tested?
   
   All the tests pass (which is verified by CI)
   
   I verified coverge of the special cases with 
   ```
   cargo llvm-cov test --html -p arrow-select
   ```
   
   # Are there any user-facing changes?
   
   No, this is test change only


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