yjshen commented on pull request #1487:
URL: https://github.com/apache/arrow-rs/pull/1487#issuecomment-1079720760


   It's been used in two places in DataFusion:
   `InMemorySorter` when we have combined all buffered batches into one single 
batch and call `arrow::compute::lexsort_to_indices` **with more than one sort 
column**. 
https://github.com/apache/arrow-datafusion/blob/master/datafusion/src/physical_plan/sorts/sort.rs#L542
   
   `SortPreservingMerge` while we are combing several partial orders into one 
final order, and during constructing `SortKeyCursor` 
https://github.com/apache/arrow-datafusion/blob/master/datafusion/src/physical_plan/sorts/mod.rs#L188


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