wiedld opened a new pull request, #4817:
URL: https://github.com/apache/arrow-rs/pull/4817

   **WIP: getting draft up now. Need to add a test and documentation. Then will 
mark ready for review.**
   
   # Which issue does this PR close?
   
   This is a change required in order to slice the row cursor in the [cascaded 
sort order](https://github.com/apache/arrow-datafusion/pull/7379).
   
   precursor for https://github.com/apache/arrow-datafusion/issues/7181
   
   # Rationale for this change
    
   During the cascaded merge, we may yield partial record batch (a.k.a. partial 
cursors) from a given merge node (in the cascade tree). As such, the cursor 
would need to be sliced as [described 
here](https://github.com/apache/arrow-datafusion/blob/d52049675ee5c335285635aea984d51b7cca9f74/datafusion/core/src/physical_plan/sorts/builder.rs#L170).
   
   # What changes are included in this PR?
   
   Slicing the cursor.
   
   # Are there any user-facing changes?
   
   No breaking changes.
   Only a new API `.slice()` method.
   


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