alamb opened a new pull request, #10636:
URL: https://github.com/apache/datafusion/pull/10636

   ## Which issue does this PR close?
   
   Part of #10546
   
   
   ## Rationale for this change
   
   While working on https://github.com/apache/datafusion/pull/10549 it 
cumbersome to create a `ParquetExec` -- there are a few fields on 
`ParquetExec::new` that need default values that make it slightly confusing to 
use. 
   
   ## What changes are included in this PR?
   
   1. Add ParquetExecBuilder and ParquetExec::builder() that handle defaults
   2. Add an example
   3. Update the code to use the new API
   
   You can see this in action here #10618
   
   
   ## Are these changes tested?
   
   Yes, covered by existing tests and new doc example tests
   
   ## Are there any user-facing changes?
   
   <!--
   If there are user-facing changes then we may require documentation to be 
updated before approving the PR.
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   If there are any breaking changes to public APIs, please add the `api 
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