UpdateQuery  mutation_table (children 3)
 Identifier mutation_table
 Function and (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 \'2020-08-03\'
