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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