AlterQuery  table_with_cyclic_defaults (children 2)
 ExpressionList (children 2)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration c (children 2)
    DataType String
    Identifier b
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration b (children 2)
    DataType String
    Identifier c
 Identifier table_with_cyclic_defaults