A-querycorrectnesshelp wanted
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Description
Right now, it's not possible to order by aggregates, so that queries like
[:find
(count ?x)
:where
[_ :mentions ?x]
:order
(count ?x)]
are not possible. (They don't parse, due to :order expecting bare variables.)
@rnewman suggests this is simply not implemented, and says: the obvious solution is to take each :order that’s a valid aggregate expression and push it into the projector, just as we do now with order-vars. It would perhaps be worthwhile to make sure that
[:find ?person (sum ?balance)
:where …
:order (desc (sum ?balance))]
generates
SELECT datoms00.e AS ?person, sum(datoms00.v) AS ?balance … ORDER BY ?balance DESC
rather than mentioning sum twice. Otherwise this should mostly be a matter of extending the parser and altering some type choices in the projector/ordering hookup, which already exists.