GitHub user alamb added a comment to the discussion: How does 'sort' interact 
with record batches?

If the data isn't sorted by `userPrimaryKey` after `sort()` is called, then I 
think that is a bug.


I wonder if you could provide an explain plan? Something like
```rust
ctx
        .table("table")
        .await?
        .window(vec![row_number().alias(DATA_FUSION_ROW_NUMBER)])
       .sort(vec![ident("userPrimarkyKey").sort(true, true)])?
       .explain(false, false)
```


GitHub link: 
https://github.com/apache/datafusion/discussions/15711#discussioncomment-12979830

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