SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function runningConcurrency (children 1)
     ExpressionList (children 2)
      Function toDate (children 1)
       ExpressionList (children 1)
        Function arrayJoin (children 1)
         ExpressionList (children 1)
          Literal Array_[UInt64_1, UInt64_2]
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'2000-01-01\'
