MDEV-16342 SHOW ENGINES: MyISAM description is useless

rewrite tautological engine descriptions

mysql-test/r/information_schema.result

@@ -1387,7 +1387,7 @@ USE test;
 End of 5.0 tests.
 select * from information_schema.engines WHERE ENGINE="MyISAM";
 ENGINE	SUPPORT	COMMENT	TRANSACTIONS	XA	SAVEPOINTS
-MyISAM	DEFAULT	MyISAM storage engine	NO	NO	NO
+MyISAM	DEFAULT	Non-transactional engine with good performance and small data footprint	NO	NO	NO
 grant select on *.* to user3148@localhost;
 select user,db from information_schema.processlist;
 user	db

mysql-test/suite/federated/have_federatedx.inc

 if (!`SELECT count(*) FROM information_schema.plugins WHERE
       plugin_name = 'federated' AND plugin_status = 'active' AND
-      plugin_description LIKE '%FederatedX%'`){
+      plugin_description LIKE '%transactions%'`){
   skip Need FederatedX engine;
 }

mysql-test/suite/funcs_1/r/is_engines_archive.result

@@ -2,7 +2,7 @@ SELECT * FROM information_schema.engines
 WHERE ENGINE = 'ARCHIVE';
 ENGINE	ARCHIVE
 SUPPORT	YES
-COMMENT	Archive storage engine
+COMMENT	gzip-compresses tables for a low storage footprint
 TRANSACTIONS	NO
 XA	NO
 SAVEPOINTS	NO

mysql-test/suite/funcs_1/r/is_engines_csv.result

@@ -2,7 +2,7 @@ SELECT * FROM information_schema.engines
 WHERE ENGINE = 'CSV';
 ENGINE	CSV
 SUPPORT	YES
-COMMENT	CSV storage engine
+COMMENT	Stores tables as CSV files
 TRANSACTIONS	NO
 XA	NO
 SAVEPOINTS	NO

mysql-test/suite/funcs_1/r/is_engines_federated.result

@@ -2,7 +2,7 @@ SELECT * FROM information_schema.engines
 WHERE ENGINE = 'FEDERATED';
 ENGINE	FEDERATED
 SUPPORT	YES
-COMMENT	FederatedX pluggable storage engine
+COMMENT	Allows to access tables on other MariaDB servers, supports transactions and more
 TRANSACTIONS	YES
 XA	NO
 SAVEPOINTS	YES

mysql-test/suite/funcs_1/r/is_engines_myisam.result

@@ -2,7 +2,7 @@ SELECT * FROM information_schema.engines
 WHERE ENGINE = 'MyISAM';
 ENGINE	MyISAM
 SUPPORT	DEFAULT
-COMMENT	MyISAM storage engine
+COMMENT	Non-transactional engine with good performance and small data footprint
 TRANSACTIONS	NO
 XA	NO
 SAVEPOINTS	NO

storage/archive/ha_archive.cc

@@ -1840,7 +1840,7 @@ maria_declare_plugin(archive)
   &archive_storage_engine,
   "ARCHIVE",
   "Brian Aker, MySQL AB",
-  "Archive storage engine",
+  "gzip-compresses tables for a low storage footprint",
   PLUGIN_LICENSE_GPL,
   archive_db_init, /* Plugin Init */
   archive_db_done, /* Plugin Deinit */

storage/csv/ha_tina.cc

@@ -1800,7 +1800,7 @@ maria_declare_plugin(csv)
   &csv_storage_engine,
   "CSV",
   "Brian Aker, MySQL AB",
-  "CSV storage engine",
+  "Stores tables as CSV files",
   PLUGIN_LICENSE_GPL,
   tina_init_func, /* Plugin Init */
   tina_done_func, /* Plugin Deinit */

storage/federated/ha_federated.cc

@@ -3503,7 +3503,7 @@ maria_declare_plugin(federated)
   &federated_storage_engine,
   "FEDERATED",
   "Patrick Galbraith and Brian Aker, MySQL AB",
-  "Federated MySQL storage engine",
+  "Allows to access tables on other MariaDB servers",
   PLUGIN_LICENSE_GPL,
   federated_db_init, /* Plugin Init */
   federated_done, /* Plugin Deinit */

storage/federatedx/ha_federatedx.cc

@@ -3608,7 +3608,7 @@ maria_declare_plugin(federatedx)
   &federatedx_storage_engine,
   "FEDERATED",
   "Patrick Galbraith",
-  "FederatedX pluggable storage engine",
+  "Allows to access tables on other MariaDB servers, supports transactions and more",
   PLUGIN_LICENSE_GPL,
   federatedx_db_init, /* Plugin Init */
   federatedx_done, /* Plugin Deinit */

storage/myisam/ha_myisam.cc

@@ -2346,7 +2346,7 @@ maria_declare_plugin(myisam)
   &myisam_storage_engine,
   "MyISAM",
   "MySQL AB",
-  "MyISAM storage engine",
+  "Non-transactional engine with good performance and small data footprint",
   PLUGIN_LICENSE_GPL,
   myisam_init, /* Plugin Init */
   NULL, /* Plugin Deinit */