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Allow queries of multiple SELECTs combined together with UNIONs/EXCEPTs/INTERSECTs to be pushed down to foreign engines. If the foreign engine provides an interface method "create_unit" and the UNIT is a top-level unit of the SQL query then the server tries to push the whole SELECT_LEX_UNIT down to the engine for execution. The engine should perform necessary checks and if they succeed, execute the query. If the engine is unable to execute the whole unit, then another attempt is made to push down SELECTs composing the unit separately using the "create_select" interface method. In this case the results of separate SELECTs are combined at the server side thus composing the final result |
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| .. | ||
| AUTHORS | ||
| ChangeLog | ||
| CMakeLists.txt | ||
| FAQ | ||
| federatedx_io.cc | ||
| federatedx_io_mysql.cc | ||
| federatedx_io_null.cc | ||
| federatedx_probes.h | ||
| federatedx_pushdown.cc | ||
| federatedx_pushdown.h | ||
| federatedx_txn.cc | ||
| ha_federatedx.cc | ||
| ha_federatedx.h | ||
| README | ||
| README.windows | ||
This is the FederatedX Storage Engine, developed as an external storage engine. NOTE: The following is only relevant if you use it for MySQL. MariaDB already comes with the latest version of FederatedX. To install, grab a copy of the mysql source code and run this: ./configure --with-mysql=/path/to/src/mysql-5.x --libdir=/usr/local/lib/mysql/ make install And then inside of MySQL: mysql> INSTALL PLUGIN federatedx SONAME 'libfederatedx_engine.so'; mysql> CREATE TABLE `d` (`a` varchar(125), b text, primary key(a)) ENGINE=FEDERATEDX CONNECTION="mysql://root@host/schema/table" or mysql> CREATE TABLE `d` (`a` varchar(125), b text, primary key(a)) ENGINE=FEDERATEDX CONNECTION="server" CHARSET=latin1; You will probably need to edit the Makefile.am in the src/ tree if you want to build on anything other then Linux (and the Makefile assumes that the server was not compiled for debug). The reason for the two possible configure lines is that libdir is dependent on where MySQL was installed. If you run the "INSTALL PLUGIN ..." and you get a file not found, check that your configured this directory correctly. For Solaris you can enable DTrace probes by adding to configure --enable-dtrace