Re: GROUPING - Mailing list pgsql-hackers

From Andrew Gierth
Subject Re: GROUPING
Date
Msg-id 87twv6z6ni.fsf@news-spur.riddles.org.uk
Whole thread Raw
In response to Re: GROUPING  (Dean Rasheed <dean.a.rasheed@gmail.com>)
Responses Re: GROUPING  (Dean Rasheed <dean.a.rasheed@gmail.com>)
List pgsql-hackers
>>>>> "Dean" == Dean Rasheed <dean.a.rasheed@gmail.com> writes:
>> Maybe INT8 would be a better choice than INT4?  But I'm not sure>> there's any practical use-case for more than 30
groupingsets>> anyway.  Keep in mind the actual output volume probably grows like>> 2^N.
 
Dean> Actually using ROLLUP the output volume only grows linearly withDean> N. I tend to think that having such a large
numberof groupingDean> sets would be unlikely, however, it seems wrong to be putting anDean> arbitrary limit on it
that'ssignificantly smaller than theDean> number of columns allowed in a table.
 

Limit on what exactly?

Consider that in both MSSQL 2014 and Oracle 12 the limit on the number
of arguments in a GROUPING() expression is ... 1.

-- 
Andrew (irc:RhodiumToad)



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