On 19/10/2018 06:24, nonomura wrote: > Adriano, > > I've read your comment again, carefully, and understood what you were > thinking as > "the root of the problem". > > But I could not understand how it is relating to the case that I > reported. > > ICU library generates sort keys for those three collations and > Firebird uses it. > Firebird generates sort keys for collations other than those of ICU's. > Is this correct? > > You were talking about the sort key generation in Firebird, right? > I was talking about ICU's. > > That's why we were talking past each other, maybe? > Or do you mean that the sort key generated through ICU library is > reorganized > in Firebird? If so, please tell me how.
ICU generates sort key for a single string. For multi segment (columns) index/sort, Firebird call ICU (or any collation) for each column and join the generated fully (with all levels/strengths) sort keys. To generate interleaved keys and joins them in another manner, Firebird INTL interface should be changed, so Firebird could ask a collation for the sort key's levels/strengths separated. Adriano Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
