Grouping by Option[List[String]] fails with must appear in the GROUP BY clause or be used in an aggregate function

Hello,

I’m having an issue trying to group by a nullable array column with a default.

I have a table like this

trait TestTableSpec { this: TestSchema with PgArraySupport =>

  import api._

  class TestTable(tag: Tag) extends Table[Test](tag, "test") {

    def id = column[Int]("id")
    def timestamp = column[LocalDateTime]("timerino")
    def one = column[Int]("one")
    def optionInt = column[Option[Int]]("two")
    def three = column[List[Int]]("three")
    def four = column[Option[List[String]]]("four")

    def * = (id, timestamp, one, optionInt, three, four) <> ((Test.apply _).tupled, Test.unapply)

  }

  val tests = lifted.TableQuery[TestTable]

}

case class Test(id: Int, time: LocalDateTime, one: Int, optionInt: Option[Int], three: List[Int], four: Option[List[String]])

And I’m trying to perform a query as such:

  def caseTest = {
    db.run(
        tests.groupBy(table =>
          table.four.getOrElse(List("No"))

//          The below works
//          table.four

// Tried the below as well, but results in "Caught exception while computing default value for Rep[Option[_]].getOrElse -- This cannot be done lazily when the value is needed on the database side"
//          (Case If table.four.isDefined Then table.four.get Else List("No")).unnest
        ).map(q => q._1 -> q._2.size).result

    )
  }

However, the query results in the following:

[info] 1418 [scala-execution-context-global-15] DEBUG slick.basic.BasicBackend.action - #1: result [select coalesce("four", ?), count(1) from "test" group by coalesce("four", ?)]
[info] 1419 [test-2] DEBUG slick.jdbc.JdbcBackend.statement - Preparing statement: select coalesce("four", ?), count(1) from "test" group by coalesce("four", ?)
[info] 1425 [test-2] DEBUG slick.jdbc.JdbcBackend.statement - Executing prepared statement: HikariProxyPreparedStatement@809193186 wrapping select coalesce("four", '{"No"}'), count(1) from "test" group by coalesce("four", '{"No"}')
[info] 1425 [test-2] DEBUG s.j.J.statementAndParameter - Executing prepared statement: HikariProxyPreparedStatement@809193186 wrapping select coalesce("four", '{"No"}'), count(1) from "test" group by coalesce("four", '{"No"}')
[info] 1430 [test-2] DEBUG slick.jdbc.JdbcBackend.parameter - /--------+--------\
[info] 1430 [test-2] DEBUG slick.jdbc.JdbcBackend.parameter - | 1      | 2      |
[info] 1430 [test-2] DEBUG slick.jdbc.JdbcBackend.parameter - | Array  | Array  |
[info] 1430 [test-2] DEBUG slick.jdbc.JdbcBackend.parameter - |--------+--------|
[info] 1430 [test-2] DEBUG slick.jdbc.JdbcBackend.parameter - | {"No"} | {"No"} |
[info] 1430 [test-2] DEBUG slick.jdbc.JdbcBackend.parameter - \--------+--------/
[error] org.postgresql.util.PSQLException: ERROR: column "test.four" must appear in the GROUP BY clause or be used in an aggregate function

Copying the exact query from the logs and running it in postgres console works just fine, so I’m a little stumped.

Thanks for your time.

[tminglei]

Released in v0.17.3

[tminglei]

Can be soon.