metegenez opened a new pull request, #1306:
URL: https://github.com/apache/datafusion-ballista/pull/1306

   # Which issue does this PR close?
   
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   Closes https://github.com/apache/datafusion-ballista/issues/1296.
   
    # Rationale for this change
   <!--
    Why are you proposing this change? If this is already explained clearly in 
the issue then this section is not needed.
    Explaining clearly why changes are proposed helps reviewers understand your 
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   The issue stems from the staging logic. When there’s a functional dependency 
on columns (e.g., column_a = 1), sorting may be unnecessary at that point, so 
SortExec won’t sort that column. However, once the plan is split into stages, 
the planner can lose this dependency information that was available in the 
single, unified plan, causing upstream operators that require ordering to miss 
it.
   
   # What changes are included in this PR?
   <!--
   There is no need to duplicate the description in the issue here but it is 
sometimes worth providing a summary of the individual changes in this PR.
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   EnforceSorting for stages.
   
   # Are there any user-facing changes?
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   If there are user-facing changes then we may require documentation to be 
updated before approving the PR.
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   No.
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