currently, INSTALL PLUGIN always installs a plugin with all parameters having
default values. It doesn't always work, for example InnoDB needs to know
innodb_home_data_dir, otherwise it won't work.

We will support parameters, similar to command line or server variables, in the
INSTALL PLUGIN.

The syntax will be





  INSTALL PLUGIN pluginname SONAME "soname"

          [SET var1=val1[, var2=val2[, ...]]] ;





the parser will put these name=value pairs into an array. The sql_plugin.cc will

use my_getopt to parse this array and assign values to command-line parameters.



On mysqld shutdown these values are lost, as SET values always do. One should

use my.cnf for settings that should persist.



Also we could re-read my.cnf on every INSTALL PLUGIN and pick the relevant

options from there.

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