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Posted to github@arrow.apache.org by "mslapek (via GitHub)" <gi...@apache.org> on 2023/03/25 09:44:56 UTC

[GitHub] [arrow-datafusion] mslapek commented on issue #5681: Move some rules and code into Analyzer

mslapek commented on issue #5681:
URL: https://github.com/apache/arrow-datafusion/issues/5681#issuecomment-1483780310

   This is a very important feature. 🪜
   
   Moving `TypeCoercion` into pre-optimizer phase would allow to avoid "Mismatch between schema and batches", like #5733 (and possibly #5695).
   
   `TypeCoercion` being **an optimizer** is a broken concept - because optimizers cannot change the final schema of the logical plan.
   
   What is more, `Expr::Case` has an assumption, that all inputs are **already** coerced.


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