The MonetDB team at CWI/MonetDB BV is pleased to announce the Jan2014 feature release of the MonetDB suite of programs.
More information about MonetDB can be found on our website at http://www.monetdb.org/.
For details on this release, please see the release notes at http://www.monetdb.org/Downloads/ReleaseNotes.
As usual, the download location is http://dev.monetdb.org/downloads/.
Jan 2014 feature release Build Environment * Created development packages for RPM based systems and Debian/Ubuntu containing the files needed to create extensions to the SQL front end. * Removed Mx, the literate programming tool. All code for the server is now pure C. * Created packages for RPM based systems and Debian/Ubunty containing the MonetDB interface to the GNU Scientific Library (gsl). * We no longer install the .la files in our Fedora/Debian/Ubuntu packages.
Client Package * ODBC: Implemented {fn scalar()} and {interval ...} escapes.
python2 * Changed defaults for connecting (defaults to unix socket now). * Unix sockets partially working for control protocol. * Add support for unix socket.
python3 * Changed defaults for connecting (defaults to unix socket now). * Unix sockets partially working for control protocol. * Add support for unix socket.
R * The R connector is now distributed in the source code packages.
MonetDB Common * The join code has been completely rewritten. It now optionally uses candidate lists, like the select code that was introduced in the previous release. * A new indexing structure for range selections on unsorted data has been added. * The vmtrim thread is no longer started by default on 64 bit architectures. The vmtrim thread monitors memory usage and drops BATs from memory when memory gets tight. However, in the age of large address spaces and virtual memory, the kernel does a good enough job. And in addition to dropping BATs, the thread also destroyed indexing structures which would have to be recreated the next time they were needed. * Cleaned up some of the parameters dealing with memory usage. * If available on the system, we now use atomic instructions for latching. * Removed some unused fields in the atomDesc structure. This change requires a complete recompilation of the whole suite. * Replaced the mutex implementation for both GNU C and Visual Studio with a home-grown implementation that uses atomic instructions (__sync_*() in gcc, _Interlocked*() in VS).
SQL * Added support for quantiles (generalization of median). Usage: SELECT quantile(column_name,0.25) FROM table_name; The value should be in the range 0..1.
Bug Fixes * 3040: Wrong NULL behavior in EXCEPT and INTERSECT * 3092: ODBC client doesn't support scalar function escape * 3198: SIGSEGV insert_string_bat (b=0x7fffe419d0a0, n=0x7fffc4006010, append=0) at gdk_batop.c:196 * 3210: Unexpected concurrency conflict when inserting to 2 tables simultaneously and querying one of them * 3273: Add support to Python DBAPI package for timetz, inet and url types * 3285: no such table 'queryHistory' * 3298: GDKmmap messages and monetdb start db takes very long * 3354: Introduce query time-out * 3371: (i)like generates batloop instead of algebra.likesubselect * 3372: Large group by queries never complete - server at 100% cpu(all cores) until MonetDB stopped * 3383: Bad performance with DISTINCT GROUP BY * 3391: Bad performance with GROUP BY and FK with out aggregate function * 3393: "COPY .. INTO ..." - escape of string quotes * 3399: server crashed on simple (malformed) query * 3401: inconsistent/strange handling of invalid dates (e.g. 2013-02-29) in where clause * 3403: NOT NULL constraint can't be applied after deleting rows with null values * 3404: Assertion `h->storage == STORE_MMAP' failed. * 3408: nested concat query crashed server * 3411: (disguised) BETWEEN clause not recognised. Hence no rangejoin. * 3412: Boolean expressions in WHERE clause, result in incorrect resulsts * 3417: Nested Common Table Expressions Crash * 3418: Segmentation fault on a query from table expression * 3419: Database does not start after upgrade * 3420: Database does not start after upgrade * 3423: Group by alias with distinct count doesn't work * 3425: Temporal extraction glitches * 3427: Consistent use of current_timestamp and now() * 3428: Aggregation over two columns is broken * 3429: SAMPLE on JOIN result crashes server * 3430: Wrong temporary handling * 3431: SQLGetInfo returns incorrect value for SQL_FN_NUM_TRUNCATE * 3432: MonetDB SQL syntax incompatible with SQL-92 <delimited identifier> syntax * 3435: INDEX prevents JOIN from discovering matches * 3436: COPY INTO from file containing leading Byte Order Mark (BOM) causes corruption