AlterQuery  mutation_table (children 3)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier name
     Literal \'car\'
   ExpressionList (children 1)
    Assignment dt (children 1)
     Function toDateOrNull (children 1)
      ExpressionList (children 1)
       Literal \'2020-08-02\'
 Identifier mutation_table
 Set