alamb opened a new pull request, #10178:
URL: https://github.com/apache/datafusion/pull/10178

   ## Which issue does this PR close?
   
   Follow on to https://github.com/apache/datafusion/pull/9595 from @haohuaijin 
   
   ## Rationale for this change
   
   @appletreeisyellow and I noticed this while upgrading IOx -- there are times 
when the code would like to create `Expr::Column` that reference each of the 
columns in a schema
   
   To do so it would be nice to be able to create a `Column` directly from a 
`&FieldRef` rather than having to to first call `.as_ref()` on the `FieldRef
   
   
   
   ## What changes are included in this PR?
   
   Changes:
   1. Add `Column::from(Tableref, &FieldRef)`
   2. Change some code to use the new API
   
   ## Are these changes tested?
   By existing tests
   
   ## Are there any user-facing changes?
   
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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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