[GitHub] [arrow-datafusion] andygrove opened a new issue, #4082: SingleDistinctToGroupBy being applied too broadly

[GitBox <gi...@apache.org>]

andygrove opened a new issue, #4082:
URL: https://github.com/apache/arrow-datafusion/issues/4082

   **Describe the bug**
   The intent of SingleDistinctToGroupBy is to rewrite queries that have multiple references to the same distinct expression, such as `SELECT F1(DISTINCT s),F2(DISTINCT s)` to avoid evaluating the distinct multiple times.
   
   However, it is currently applied even if there is only a single distinct value, adding unnecessary complexity to simple queries,
   
   **To Reproduce**
   Only apply the rule when it is needed.
   
   **Expected behavior**
   
   
   **Additional context**
   benchmark q16 is a good example of where it is applied but not needed
   


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[GitHub] [arrow-datafusion] andygrove closed issue #4082: SingleDistinctToGroupBy being applied too broadly

[GitBox <gi...@apache.org>]

andygrove closed issue #4082: SingleDistinctToGroupBy being applied too broadly
URL: https://github.com/apache/arrow-datafusion/issues/4082


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