thinkharderdev commented on issue #1862:
URL: 
https://github.com/apache/arrow-datafusion/issues/1862#issuecomment-1044333494


   I think we need a way to allow the registration of custom optimizers, udfs, 
etc at startup. Part of the rationale for 
https://github.com/apache/arrow-datafusion/pull/1677 was to create a global 
`ExecutionContext` at startup that could serve as a hook to register extension 
object stores, planners, optimizers and udf/udaf (i.e. that we can use all the 
extensible features of DataFusion with Ballista). 
   
   Maybe we can still create the scheduler with an 
`ExecutionContext`\`SessionContext` and call it `session_template` or something 
like that. Then new sessions are cloned from that template (with any 
session-specific settings applied)?


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