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`SELECT DISTINCT foo FROM bar` is not yet implemented and was returning an "unplanned item" error which isn't useful to users so I replaced it with `SELECT DISTINCT is not yet supported`. `SELECT foo, COUNT(*) FROM bar GROUP BY ALL foo` is not supported. Specifically the `ALL` part. It is fairly esoteric so see [1] for what it does. Regardless of what it does it is not widely supported and even Microsoft's SQL Server has deprecated it so we should never support it. Probably. [1]: https://technet.microsoft.com/en-us/library/ms175028(v=sql.90).aspx Related to elastic/x-pack-elasticsearch#3176 Original commit: elastic/x-pack-elasticsearch@56e5ca3009