-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 03/06/2011 05:22 AM, Alexey Pechnikov wrote: > I think one or more hash functions may be > included into core SQLite.
(Argggh. You posted the same message to multiple mailing lists. That is annoying.) Why can't you use the SQLite API in order to register the functions for your databases? Every now and then people request that some favourite function special to them be part of the core. Rarely does anyone show that it would be broadly useful to the however many billion instances of SQLite around the world. And even rarer still does anyone show how the existing SQLite mechanisms to add functions are problematic. For something to be added to the core it means the code has to be compatible with the SQLite license (public domain, on file contributor agreement), has to be implemented by the SQLite team (fit in with the existing coding style, error handling, test infrastructure), has to be included in the testing (remember there is 100% MCDC coverage) and has to be maintained in SQLite 3 until it is end of lifed. This is a lot of work to inflict on the team. The murmur hash is good example of why it would be a bad idea to include the SQLite core. There are many different versions (1, 2, 2A, 2-32, 2-64, 3) and it currently works on binary blobs. To use it for strings would require defining encoding and byte ordering. You can create an extension that includes a whole bunch of hash functions. Make it available to the world by getting it listed at the end of http://sqlite.org/contrib where you can see a good 'extension-functions.c' to follow. If the team see the extension being downloaded a lot then that is a good case for migrating it into the core. Roger -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk1z0UUACgkQmOOfHg372QRTcwCguCl0ZZCDnYHSdK9hyRucdEE2 aiEAoMRGLPH8RCuD/mOnW2levNbr/QyF =D5kz -----END PGP SIGNATURE----- _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
