SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function arrayJoin (alias a) (children 1)
     ExpressionList (children 1)
      Literal Array_[Array_[UInt64_1, UInt64_2, UInt64_3]]
    Function arrayJoin (alias b) (children 1)
     ExpressionList (children 1)
      Identifier a
