Re: why there are two TargetEntrys in Query when i use "select count(catcode) from pois group by catcode"?

sunpeng <bluevaley@gmail.com> writes:
> after i execute "select count(*) from pois group by catcode";
> the log of query.targetList is :
> why there is the second TARGETENTRY? what's the purpose of the second
> TARGETENTRY?

It's the GROUP BY expression.  Note the ressortgroupref and resjunk
settings.

            regards, tom lane