alamb commented on PR #15301:
URL: https://github.com/apache/datafusion/pull/15301#issuecomment-2761504336

   > Things that serialize a PhysicalExpr across the wire, e.g. 
https://github.com/XiangpengHao/liquid-cache does it via 
[serialize_physical_expr](https://github.com/apache/datafusion/blob/46f4024577f4e13b79d8739849ecf51af5ddc7c2/datafusion/proto/src/physical_plan/mod.rs#L1720-L1723).
   
   I think you can do this via 
https://docs.rs/datafusion-proto/latest/datafusion_proto/physical_plan/trait.PhysicalExtensionCodec.html
 (which has no documentation 🤦  -- there is an exampel somewhere thought)


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