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CASE WHEN expressions don't work

CASE WHEN expressions don't work: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). I tried to run a query with a CASE WHEN expression in the SELECT list and TiDB rejected it instead of evaluating the expression. Something like: and also the simple form: Both fail — the…

The task

I tried to run a query with a CASE WHEN expression in the SELECT list and TiDB rejected it instead of evaluating the expression. Something like: and also the simple form: Both fail — the planner refuses the statement instead of returning the values I'd expect. The same queries…

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.