Hi there

I think the group by clause is only enforced when more than one result is 
returned. Surely this is a grammar issue, regardless of the data returned?

For this (malformed) query, the group by is missing, but still the query 
runs returning one result:

*select state, count(state) from receipt where ingestion_timestamp > 
'2019-04-10 11:14:00'*


If I change the predicate so that more results are returned, the engine 
complains:

*select state, count(state) from receipt where ingestion_timestamp <= 
'2019-04-10 11:14:00'*


My issue is that this group by should have been enforced at all times, not 
just when it's needed for multi-row return.

*select state, count(state) from receipt where ingestion_timestamp <= 
'2019-04-10 11:14:00' group by state*


Please confirm this is a bug.

Thanks
Rich

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