gistfile1.cpp

StringVal AddStringValImpl(FunctionContext* context, const StringVal& s1, const StringVal& s2) {
    if (s1.is_null || s2.is_null) {
        context.AddWarning("AddStringValImpl: Attempted to concat NULL string; returning NULL");
        return StringVal::null();
    }
    if (s1.len == 0) return s2;
    if (s2.len == 0) return s1;
    StringVal retval(context, s1.len + s2.len);
    memcpy(retval.ptr, s1.ptr, s1.len);
    memcpy(retval.ptr + s1.len, s2.ptr, s2.len);
    return retval;
}