thinkharderdev opened a new issue, #8:
URL: https://github.com/apache/arrow-ballista/issues/8

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   A clear and concise description of what the problem is. Ex. I'm always 
frustrated when [...] 
   (This section helps Arrow developers understand the context and *why* for 
this feature, in addition to  the *what*)
   
   Currently, we are working with DataFusion/Ballista as a query execution 
engine. One of the primary selling points for DataFusion is extensibility but 
it is not currently possible to use the many extension points in DataFusion 
with Ballista. 
   
   This is primarily due to the constraints of serializing all logical and 
physical plans as Protobuf messages. 
   
   Ideally we would like to use Ballista to execute:
   * Scans using custom object stores
   * User Defined logical plan extensions
   * User defined physical plan extensions
   * User defined scalar and aggregation functions
   
   
   **Describe the solution you'd like**
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   There are two things ideally:
   1. We would like to decouple the core Ballista functionality from the 
serializable representations of plans so that the serde layer can become 
pluggable/extensible. 
   2. Serde should be aware of a user-defined `ExecutionContext` so we can 
leverage optimizers, extension planners, and udf/udaf
   
   **Describe alternatives you've considered**
   A clear and concise description of any alternative solutions or features 
you've considered.
   
   There currently is no workaround for this but we have been prototyping 
possible solutions which we'd be interested in upstreaming. 
   
   **Additional context**
   Add any other context or screenshots about the feature request here.
   


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