AlterQuery  t_json_mutations (children 2)
 ExpressionList (children 3)
  AlterCommand DROP_COLUMN (children 1)
   Identifier s
  AlterCommand DROP_COLUMN (children 1)
   Identifier obj
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration t (children 2)
    DataType String
    Literal \'foo\'
 Identifier t_json_mutations
