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Posted to github@datafusion.apache.org by "adriangb (via GitHub)" <gi...@apache.org> on 2025/12/20 04:15:31 UTC
[I] option to disable evaluation of stable expressions in optimizer rules [datafusion]
adriangb opened a new issue, #19418:
URL: https://github.com/apache/datafusion/issues/19418
### Is your feature request related to a problem or challenge?
I'm doing some rewrites where I want to handle `now()`, but if I run the query through the optimizer if evaluates it using the current time.
### Describe the solution you'd like
I'd like to add a configuration to `OptimzierConfig` to disable these evaluations: `evaluate_stable_functions = false;`
### Describe alternatives you've considered
Wrapping every stable function in a UDF that is pass through but modifies the signature to `Immutable`. This is complex and error prone (there's like a dozen methods in the UDF trait).
### Additional context
_No response_
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Re: [I] option to disable evaluation of stable expressions in optimizer rules [datafusion]
Posted by "manishkr (via GitHub)" <gi...@apache.org>.
manishkr commented on issue #19418:
URL: https://github.com/apache/datafusion/issues/19418#issuecomment-3678501730
@adriangb It's ok. As I see Jefffrey already reviewing it. Added a `nit` comment.
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Re: [I] option to disable evaluation of stable expressions in optimizer rules [datafusion]
Posted by "adriangb (via GitHub)" <gi...@apache.org>.
adriangb closed issue #19418: option to disable evaluation of stable expressions in optimizer rules
URL: https://github.com/apache/datafusion/issues/19418
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Re: [I] option to disable evaluation of stable expressions in optimizer rules [datafusion]
Posted by "adriangb (via GitHub)" <gi...@apache.org>.
adriangb commented on issue #19418:
URL: https://github.com/apache/datafusion/issues/19418#issuecomment-3677863629
Sorry @manishkr I had set up Claude to solve it last night but didn't push. Could you maybe review the PR? If you have any suggestions on wording, etc. I can commit those and that will include you as a co-author.
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Re: [I] option to disable evaluation of stable expressions in optimizer rules [datafusion]
Posted by "manishkr (via GitHub)" <gi...@apache.org>.
manishkr commented on issue #19418:
URL: https://github.com/apache/datafusion/issues/19418#issuecomment-3677473096
take
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Re: [I] option to disable evaluation of stable expressions in optimizer rules [datafusion]
Posted by "adriangb (via GitHub)" <gi...@apache.org>.
adriangb commented on issue #19418:
URL: https://github.com/apache/datafusion/issues/19418#issuecomment-3687542602
This would solve:
https://github.com/apache/datafusion/blob/d8e68a404aa7955b4913bab1c658a4ec5c82f0fc/datafusion/core/src/execution/context/mod.rs#L752-L756
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