presto-main/src/main/java/io/prestosql/type/CharOperators.java/CharOperators/equal
class CharOperators:    @LiteralParameters("x")
    @ScalarOperator(EQUAL)
    @SqlType(StandardTypes.BOOLEAN)
    @SqlNullable
    public static Boolean equal(@SqlType("char(x)") Slice left, @SqlType("char(x)") Slice right)
    {
        return left.equals(right);
    }