Fix: Resolve PG17 incompatibility for ENUMS in CASE statements #6099
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@vcovo |
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@gen740 in case it was missed I added the requested tests. Let me know if anything is still missing for this to be merged. |
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Motivation
I have a postgresql 17.3 DB that I also wanted to use for the results of the trials ran through Optuna - potentially linking them with my own tables through a common id. Unfortunately this lead to an error:
operator does not exist: trialvaluetype = character varyingerror when using PostgreSQL 17.3 as explained in #6096.Description of the changes
This changes the SQLAlchemy case() structure in TrialModel.find_max/min_value_trial_id to directly compare the ENUM column with Python ENUM members, avoiding problematic VARCHAR casts on string literals.