comphead commented on issue #17045:
URL: https://github.com/apache/datafusion/issues/17045#issuecomment-3156645933

   > > Thanks [@alamb](https://github.com/alamb) this is true, the entire 
`datafusion-spark` crate is more niche I would say. I still think it can be a 
subproject under datafusion, `datafusion-spark` or similar.
   > > Currently to ensure that Spark builtin functions in crate corresponds to 
Spark it is required to run tests in local Spark to verify the correctness, 
WDYT if we can introduce some CI or script to run tests using Spark inside the 
scope of this crate?
   > 
   > I suspect it it would be not a good idea to add an integration test here 
that actually runs spark, unless it can be integrated with an existing runner 
(similarly to the sqllogictests runner for postgres) 🤔
   
   Exactly, the postgres runner was an inspiration, planning to investigate if 
Spark runner can be done in a similar way. 
   
   Ideally to have a separate CI which triggers only if `datafusion-spark` 
crate changed. But stepping back and look at that again the submodule more 
reminds a separate subproject(its not a core, niche usage, separate CI, test 
runner).  We can keep it evolving in DF repo but later it would probably make 
sense to move it? 


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