DIF Zenodo first release

DIF is a collection of tools aimed at implementing a powerful indexing system for astronomical catalogues and other data with spherical coordinates, stored into MySQL / MariaDB databases.
DIF is able to use both HTM and HEALPix pixelization schemas simultaneously and it allows very fast query execution even on billion-row tables.

See also the documentation or the web page and the reference paper.

If you want to use almost all of the DIF capabilities but avoid to use MySQL / MariaDB source code, please use SID instead.

Various fixes and compatibility with new MySQL versions

Please see ChangeLog for details. No major change since last release.

MySQL 8.0 and MariaDB 10.3 reference version

Some issues are still to be addressed, but this is the reference version for usage in MySQL 8.0 and MariaDB 10.3. Tested also in MySQL 5.7 and expected to work in 5.1, 5.5, 5.6.
See ChangeLog and documentation for information.

Release pre MySQL 8

Tested to work with the MySQL 5.x (x = 1, 5, 6, 7) and MariaDB 10.y (y = 0, 1, 2) versions.
See ChangeLog and documentation for information.