val projectName1 = None //None
  val projectName2 = Some("Optimizacija u spicu")

  val firstname1 = Some("Ana")
  val firstname2 = Some("Pera")

  val query5 = withSQL {
    select(w.result.mbr, p.result.spr, p.result.projectName)
      .from(Worker as w)
      .leftJoin(WorkProject as wp).on(w.mbr, wp.mbr)
      .leftJoin(Project as p).on(wp.spr, p.spr)
      .where(toOrConditionOpt(
        projectName1.map(sqls.eq(p.projectName, _)),
        projectName2.map(sqls.eq(p.projectName, _))))
      .or(toOrConditionOpt(
        firstname1.map(sqls.eq(w.firstname, _)),
        firstname2.map(sqls.eq(w.firstname, _))))
  }.map(rs => (rs.long(1), rs.longOpt(2), rs.stringOpt(3))).list.apply

select w.mbr as m_on_w, p.spr as s_on_p, p.project_name as pn_on_p from worker w left join workproject wp on w.mbr = wp.mbr left join project p on wp.spr = p.spr where p.project_name = 'Optimizacija u spicu' or ( w.firstname = 'Ana' or w.firstname = 'Pera'); (0 ms)