InsertQuery   (children 2)
 Identifier arr
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 3)
     Function array (children 1)
      ExpressionList
     Literal NULL
     Function array (children 1)
      ExpressionList (children 3)
       Function array (children 1)
        ExpressionList
       Literal Array_[NULL]
       Literal Array_[NULL, \'Hello\']