Enable distinct_on
with postgres_backend
instead of postgres
#3657
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I noticed when working with
QueryDsl
that the methoddistinct_on
is only available when Diesel is compiled with thepostgres
feature.The trait this function is based on though is available when compiling the crate with
postgres_backend
.This PR changes the cfg flag above the function declaration to
postgres_backend
.The change shouldn't be breaking since the
postgres
feature enables thepostgres_backend
feature.