jdye64 opened a new issue, #2214:
URL: https://github.com/apache/arrow-datafusion/issues/2214

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   PostgreSQL supports the SQL `Filter Clause` which is a clause that filters 
certain rows based on the defined row expressions before an aggregation is 
performed. Currently Datafusion does not provide a mechanism for parsing those 
clauses. See [Filter Clause](https://modern-sql.com/feature/filter) for more in 
depth details on the clauses behavior.
   
   **Describe the solution you'd like**
   The `datafusion::logical_plan::plan::Aggregate` struct should include a new 
member Ex: `pub filter_expr: Vec<Expr>` which contains the filtering 
expressions that could be applied by the consuming engine before performing the 
actual aggregations that are defined in `pub aggr_expr: Vec<Expr>` 
   
   **Describe alternatives you've considered**
   None
   
   **Additional context**
   Description of the syntax and functionality can be found 
[here](https://modern-sql.com/feature/filter)
   


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