mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-18 21:44:02 +03:00
1122b64cb1
This patch fixes the problem in MCOL-4234 and also generally improves behavior of GROUP BY. It does so by introducing a "dummy" aggregate and by wrapping columns into it. This allows for columns that are not in GROUP BY to be used more freely, for example, in SELECT * FROM tbl GROUP BY col - all columns that are not "col" will be wrapped into an aggregate and query will proceed to execution. The dummy aggregate itself does nothing more than remember last value passed into it. There also an additional error message that tries to explain what types of expressions can be wrapped into an aggregate.