In MySQL 5.5, the InnoDB Plugin is the default version and it's compiled in.

In this case, the plugin cannot be uninstalled and we get error when trying

to do so:

mysql> uninstall plugin innodb;

ERROR 1305 (42000): PLUGIN innodb does not exist

But the error message is misleading. The plugin does exist, it just cannot

be installed because it's not dynamically loaded.

MySQL bug report: http://bugs.mysql.com/bug.php?id=51771

MariaDB bug report: https://mariadb.atlassian.net/browse/MDEV-4573

MariaDB fix: http://bazaar.launchpad.net/~maria-captains/maria/5.5/revision/3802

diff --git a/include/mysql.h b/include/mysql.h

index 38b54de..0b13e92 100644

--- a/include/mysql.h

+++ b/include/mysql.h

@@ -134,6 +134,7 @@ typedef unsigned long long my_ulonglong;

 /* backward compatibility define - to be removed eventually */

 #define ER_WARN_DATA_TRUNCATED WARN_DATA_TRUNCATED

+#define WARN_PLUGIN_DELETE_BUILTIN ER_PLUGIN_DELETE_BUILTIN

 typedef struct st_mysql_rows {

   struct st_mysql_rows *next;		/* list of rows */

diff --git a/mysql-test/r/plugin.result b/mysql-test/r/plugin.result

index a3d7437..8ea475d 100644

--- a/mysql-test/r/plugin.result

+++ b/mysql-test/r/plugin.result

@@ -232,3 +232,5 @@ DROP PROCEDURE p_install;

 SET DEBUG_SYNC='RESET';

 disconnect con1;

 disconnect con2;

+UNINSTALL PLUGIN MyISAM;

+ERROR HY000: Built-in plugins cannot be deleted

diff --git a/mysql-test/t/plugin.test b/mysql-test/t/plugin.test

index de68d36..bf9fb7d 100644

--- a/mysql-test/t/plugin.test

+++ b/mysql-test/t/plugin.test

@@ -277,3 +277,9 @@ disconnect con1;

 disconnect con2;

 --disable_connect_log

+

+#

+# MDEV-4573 UNINSTALL PLUGIN misleading error message for non-dynamic plugins

+#

+--error ER_PLUGIN_DELETE_BUILTIN

+UNINSTALL PLUGIN MyISAM;

diff --git a/sql/share/errmsg-utf8.txt b/sql/share/errmsg-utf8.txt

index 15acc66..35e2c3c 100644

--- a/sql/share/errmsg-utf8.txt

+++ b/sql/share/errmsg-utf8.txt

@@ -6235,7 +6235,7 @@ WARN_NO_MASTER_INFO

 WARN_OPTION_IGNORED

   eng "<%-.64s> option ignored"

   ger "Option <%-.64s> ignoriert"

-WARN_PLUGIN_DELETE_BUILTIN

+ER_PLUGIN_DELETE_BUILTIN

   eng "Built-in plugins cannot be deleted"

   ger "Eingebaute Plugins können nicht gelöscht werden"

 WARN_PLUGIN_BUSY

diff --git a/sql/sql_plugin.cc b/sql/sql_plugin.cc

index f134e4f..7e34432 100644

--- a/sql/sql_plugin.cc

+++ b/sql/sql_plugin.cc

@@ -2008,9 +2008,7 @@ bool mysql_uninstall_plugin(THD *thd, const LEX_STRING *name)

   }

   if (!plugin->plugin_dl)

   {

-    push_warning(thd, Sql_condition::WARN_LEVEL_WARN,

-                 WARN_PLUGIN_DELETE_BUILTIN, ER(WARN_PLUGIN_DELETE_BUILTIN));

-    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PLUGIN", name->str);

+    my_error(ER_PLUGIN_DELETE_BUILTIN, MYF(0));

     goto err;

   }

   if (plugin->load_option == PLUGIN_FORCE_PLUS_PERMANENT)