alamb opened a new pull request, #14038:
URL: https://github.com/apache/datafusion/pull/14038

   ## Which issue does this PR close?
   
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   - Part of https://github.com/apache/datafusion/issues/13748
   
   ## Rationale for this change
   
   While working to encapsulate the sort order code more, I noticed the free 
function `collapse_lex_ordering` that consumed a `LexOrdering` but wasn't easy 
to find. It also clones expressions unecessairly. 
   
   ## What changes are included in this PR?
   1. Move code to `LexOrdering::collapse`
   2. Improve docs
   3. Avoid clone
   
   ## Are these changes tested?
   By exisitng CI
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   1. Prevent the code from being accidentally broken by subsequent changes
   4. Serve as another way to document the expected behavior of the code
   
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   ## Are there any user-facing changes?
   No. Despite the function being `pub` it is in a non pub module, so is not 
exposed. You can see that it is not present in the docs:
   
   
https://docs.rs/datafusion/latest/datafusion/index.html?search=collapse_lex_ordering
   


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