andygrove opened a new issue #737:
URL: https://github.com/apache/arrow-datafusion/issues/737


   **Describe the bug**
   
   Query 12 is returning one row instead of two:
   
   ```
   Query 12 iteration 0 took 15833.4 ms
   +------------+-----------------+----------------+
   | l_shipmode | high_line_count | low_line_count |
   +------------+-----------------+----------------+
   | SHIP       | 622964          | 934514         |
   +------------+-----------------+----------------+
   Query 12 avg time: 15833.39 ms
   ```
   
   This started happening on this commit:
   
   ```
   commit 2176ff592e38147c1c779b5660ec73db9c161a67
   Author: Andy Grove <[email protected]>
   Date:   Mon Jul 12 18:23:43 2021 -0600
   
       Implement serde for ShuffleWriterExec (#712)
   ```
   
   **To Reproduce**
   Run the integration tests.
   
   **Expected behavior**
   Should be two rows.
   
   **Additional context**
   None
   


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