SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function arrayJoin (alias arr) (children 1)
     ExpressionList (children 1)
      Literal Array_[UInt64_1, UInt64_2, UInt64_3]
    Literal \'hello\' (alias s1)
    Literal \'world\' (alias s2)
 Identifier TabSeparated