AlterQuery  mutation_table (children 3)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Function or (children 1)
    ExpressionList (children 2)
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier name
       Literal \'car\'
     Function isNull (children 1)
      ExpressionList (children 1)
       Identifier dt
   ExpressionList (children 1)
    Assignment dt (children 1)
     Function toDateOrNull (children 1)
      ExpressionList (children 1)
       Literal \'2020-08-04\'
 Identifier mutation_table
 Set