andygrove edited a comment on issue #424:
URL: 
https://github.com/apache/arrow-datafusion/issues/424#issuecomment-847857451


   We may want to consider following Spark's approach here, since we are 
already implementing other methods such as `required_child_distribution` based 
on Spark.
   
   For sorting, Spark has:
   
   ```scala
   /** Specifies how data is ordered in each partition. */
   def outputOrdering: Seq[SortOrder]
   
   /** Specifies sort order for each partition requirements on the input data 
for this operator. */
   def requiredChildOrdering: Seq[Seq[SortOrder]]
   ```


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