kosiew commented on PR #17773:
URL: https://github.com/apache/datafusion/pull/17773#issuecomment-3349880219

   @comphead 
   > would be that possible to have e2e slt tests?
   
   Thanks for the suggestion! At the moment this PR just introduces the 
CastColumnExpr building block plus its focused unit coverage, without wiring it 
into the planner or schema-adapter path that SQLLogicTest exercises. 
   It's the first sub-issue of #17330
   Until that follow-up lands, there isn’t a SQL surface that would actually 
emit this node, so an SLT case would stay unreachable and wouldn’t add new 
signal.
   
   Once we hook the adapter/planner up to construct CastColumnExpr, I agree 
that an end-to-end SLT is the right next step and I’ll plan to cover it in that 
integration change.


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