presto-main/src/main/java/io/prestosql/operator/scalar/IdentityCast.java/IdentityCast/IdentityCast
class IdentityCast:    protected IdentityCast()
    {
        super(OperatorType.CAST,
                ImmutableList.of(typeVariable("T")),
                ImmutableList.of(),
                new TypeSignature("T"),
                ImmutableList.of(new TypeSignature("T")),
                false);
    }