u70b3 commented on issue #20355:
URL: https://github.com/apache/datafusion/issues/20355#issuecomment-5019667696

   Verified on current main (1e589287c): this no longer reproduces. `SELECT 
-'a';` is now rejected during planning with `Error during planning: Unary 
operator '-' only supports signed numeric, interval and timestamp types` — 
exactly the behavior requested in the issue. Suggest closing.


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