alamb opened a new pull request, #21556:
URL: https://github.com/apache/datafusion/pull/21556

   ## Which issue does this PR close?
   
   - Follow on to https://github.com/apache/datafusion/pull/21480 from 
@fpetkovski
   
   
   ## Rationale for this change
   
   @Dandandan  suggested 
https://github.com/apache/datafusion/pull/21480#discussion_r3055933546
   
   > Maybe better is to delay it so they are only created after we loaded the 
page index, this avoids doing it as well for files without page index (and 
avoids it in short-circuit scenarios / query cancellation).
   
   Which is a good idea to further optimize low latency queries
   
   This also applies to the clickbench_partitioned dataset which has no page 
indexes
   
   ## What changes are included in this PR?
   
   1. Delay page pruning until after we have loaded the page index (if it 
exists)
   2. Tests
   
   
   ## Are these changes tested?
   
   Yes
   
   ## Are there any user-facing changes?
   
   Faster performance (though I am not sure we will be able to measure it)


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