presto-main/src/main/java/io/prestosql/operator/scalar/JsonOperators.java/JsonOperators/equals
class JsonOperators:    @ScalarOperator(EQUAL)
    @SqlType(BOOLEAN)
    @SqlNullable
    public static Boolean equals(@SqlType(JSON) Slice leftJson, @SqlType(JSON) Slice rightJson)
    {
        return leftJson.equals(rightJson);
    }