Encountering error "Unexpected node in ResultSetMapping: OptionApply" in agg function

[zgrannan]

This error appears to occur when using OptionApply in an aggregate function. Casting the column using .asColumnOf[Option[T]] seems to be a workaround in some cases.

I made a branch with the failing test added here: https://github.com/zgrannan/slick/tree/testOptionApply

An example (the added test) is below. It's kind of a contrived example but I am encountering this error in production as part of a more complex function.

  def testOptionApply = {

    case class LiftedB(
      a: Rep[Option[Long]],
      b: Rep[Option[Long]],
      c: Rep[Option[Long]]
    )

    case class B(
      a: Option[Long],
      b: Option[Long],
      c: Option[Long]
    )

    implicit object shape
        extends CaseClassShape((LiftedB.apply _).tupled,
                             (B.apply _).tupled)

    case class ARow(id: Int, s: Long)

    class A(tag: Tag) extends Table[ARow](tag, "A_TestOptionApply") {
      def id = column[Int]("id", O.PrimaryKey)
      def s = column[Long]("s")
      def * = (id, s).mapTo[ARow]
    }
    val as = TableQuery[A]
    val data = Seq(ARow(1, 1L), ARow(2, 2L))

    as.schema.create >>
      (as ++= data) >>
      (as.length, LiftedB(
        as.map(_.s).sum.getOrElse(0L).?,
        as.map(_.s).sum.getOrElse(0L).?,
        as.map(_.s).sum.getOrElse(0L).?
      )).result.map (
        _._1 shouldBe 2
      )
  }

[hvesalai]

If you can, please post a PR to fix this.