MySQL 5.6.14 Source Code Document
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have_memcached_plugin.inc
1 disable_query_log;
2 --require r/true.require
3 select (PLUGIN_LIBRARY LIKE 'libmemcached%') as `TRUE` FROM INFORMATION_SCHEMA.PLUGINS
4  WHERE PLUGIN_NAME='daemon_memcached';
5 enable_query_log;