alamb opened a new issue #1676:
URL: https://github.com/apache/arrow-datafusion/issues/1676


   **Describe the bug**
   If we try to merge two streams that are non overlapping (e.g. `0..20` and 
`20..40`) then the following panic is produced:
   ```
   thread 'test_merge_2_no_overlap' panicked at 'assertion failed: i < 
self.len()', 
/Users/alamb/.cargo/registry/src/github.com-1ecc6299db9ec823/arrow-8.0.0/src/array/array_primitive.rs:120:9
   note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
   ```
   
   Note this won't affect any users of DataFusion unless they are using 
externalized sort that @yjshen  has recently been working on. 
   
   **To Reproduce**
   I have a fuzz tester I will contribute and link to this issue. 
   
   **Expected behavior**
   Correct answers come out, with no panic
   
   **Additional context**
   Found in some of our tests in IOx: 
https://github.com/influxdata/influxdb_iox/issues/3530
   
   I am fairly confident it is a corner case in the code from 
https://github.com/apache/arrow-datafusion/pull/1596


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