egor-ryashin commented on issue #7468: CASE with multiple types fails: Illegal mixing of types in CASE or COALESCE statement URL: https://github.com/apache/incubator-druid/issues/7468#issuecomment-482895247 Yes, it's in the standard **SQL92** `9.3 Set operation result data types` (http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt) in short, it says the result data type should be converted if possible (at least PostgreSQL also supports it). Probably it's a **Calcite** bug, then we should watch for updates and upgrade.
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