SELECT DISTINCT in Scala slick

As a work around you can try to use groupBy:

query.groupBy(x=>x).map(_._1)

It should have the same semantics as distinct, but I'm not sure about performance.

With slick 3.1.0 you can use distinct and distinctOn functions (Slick 3.1.0 release notes). For example:

val westCoast = Seq("CA", "OR", "WA")
val implicitInnerJoin = for {
  c <- Coffees
  s <- Suppliers if c.supID === s.id && s.state inSet westCoast
} yield c

db.run(implicitInnerJoin.distinctOn(_.name).result)

Update Finally bug related to distinctOn was resolved in slick 3.3.3