[GitHub] [arrow-datafusion] vincev opened a new issue, #5281: Optimizer prunes UnnestExec on aggregate count

["vincev (via GitHub)" <gi...@apache.org>]

vincev opened a new issue, #5281:
URL: https://github.com/apache/arrow-datafusion/issues/5281

   **Describe the bug**
   When running an aggregate count on an unnested column the `aggregate_statistics` optimizer removes `UnnestExec` from the `ExecutionPlan` 
   
   **To Reproduce**
   Given the following data:
   ```
   "+--------------------+",
   "| tags               |",
   "+--------------------+",                                                   
   "|                    |",                                                   
   "| [tag1, tag2, tag3] |",                                                   
   "| [tag1, tag2, tag3] |",
   "| [tag1, tag2]       |",
   "| [tag1]             |",
   "+--------------------+",
   ```
   
   The following aggregation:
   
   ```rust
   df
       .unnest_column("tags")?
       .aggregate(vec![], vec![count(col("tags"))])?
       .show()
       .await?;
   ```
   
   reports 4 rows instead of 9 unnested nested rows (see [test](https://github.com/vincev/arrow-datafusion/blob/047803a879e7af7e894280eb9c51edb5f931c249/datafusion/core/tests/dataframe.rs#L640)):
   
   **Expected behavior**
   Aggregate count should count unnested rows. 
   
   **Additional context**
   Add any other context about the problem here.
   


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[GitHub] [arrow-datafusion] alamb closed issue #5281: Optimizer prunes UnnestExec on aggregate count

["alamb (via GitHub)" <gi...@apache.org>]

alamb closed issue #5281: Optimizer prunes UnnestExec on aggregate count
URL: https://github.com/apache/arrow-datafusion/issues/5281


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