WL#5496 - Plugin LOAD_OPTION in INFORMATION_SCHEMA.PLUGINS

This patch implements I_S.PLUGINS.LOAD_OPTION column
as specified by WL#5496.

mysql-test/r/plugin_load_option.result:
  A test case for WL#5496.
mysql-test/suite/funcs_1/r/is_columns_is.result:
  Adjusted a test case according to WL#5496.
mysql-test/t/plugin_load_option.test:
  A test case for WL#5496.
sql/sql_show.cc:
  Added LOAD_OPTION column to I_S.PLUGINS.

mysql-test/r/plugin_load_option.result

 UNINSTALL PLUGIN example;
 ERROR HY000: Plugin 'example' is force_plus_permanent and can not be unloaded
+SELECT PLUGIN_NAME, PLUGIN_STATUS, LOAD_OPTION FROM INFORMATION_SCHEMA.PLUGINS
+WHERE PLUGIN_NAME IN ('MyISAM', 'EXAMPLE');
+PLUGIN_NAME	PLUGIN_STATUS	LOAD_OPTION
+MyISAM	ACTIVE	FORCE
+EXAMPLE	ACTIVE	FORCE_PLUS_PERMANENT

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

@@ -165,6 +165,7 @@ def	information_schema	PARTITIONS	TABLE_NAME	3		NO	varchar	64	192	NULL	NULL	utf8
 def	information_schema	PARTITIONS	TABLE_ROWS	13	0	NO	bigint	NULL	NULL	20	0	NULL	NULL	bigint(21) unsigned			select	
 def	information_schema	PARTITIONS	TABLE_SCHEMA	2		NO	varchar	64	192	NULL	NULL	utf8	utf8_general_ci	varchar(64)			select	
 def	information_schema	PARTITIONS	UPDATE_TIME	20	NULL	YES	datetime	NULL	NULL	NULL	NULL	NULL	NULL	datetime			select	
+def	information_schema	PLUGINS	LOAD_OPTION	11		NO	varchar	64	192	NULL	NULL	utf8	utf8_general_ci	varchar(64)			select	
 def	information_schema	PLUGINS	PLUGIN_AUTHOR	8	NULL	YES	varchar	64	192	NULL	NULL	utf8	utf8_general_ci	varchar(64)			select	
 def	information_schema	PLUGINS	PLUGIN_DESCRIPTION	9	NULL	YES	longtext	4294967295	4294967295	NULL	NULL	utf8	utf8_general_ci	longtext			select	
 def	information_schema	PLUGINS	PLUGIN_LIBRARY	6	NULL	YES	varchar	64	192	NULL	NULL	utf8	utf8_general_ci	varchar(64)			select	
@@ -562,6 +563,7 @@ NULL	information_schema	PARTITIONS	CHECKSUM	bigint	NULL	NULL	NULL	NULL	bigint(21
 3.0000	information_schema	PLUGINS	PLUGIN_AUTHOR	varchar	64	192	utf8	utf8_general_ci	varchar(64)
 1.0000	information_schema	PLUGINS	PLUGIN_DESCRIPTION	longtext	4294967295	4294967295	utf8	utf8_general_ci	longtext
 3.0000	information_schema	PLUGINS	PLUGIN_LICENSE	varchar	80	240	utf8	utf8_general_ci	varchar(80)
+3.0000	information_schema	PLUGINS	LOAD_OPTION	varchar	64	192	utf8	utf8_general_ci	varchar(64)
 NULL	information_schema	PROCESSLIST	ID	bigint	NULL	NULL	NULL	NULL	bigint(4)
 3.0000	information_schema	PROCESSLIST	USER	varchar	16	48	utf8	utf8_general_ci	varchar(16)
 3.0000	information_schema	PROCESSLIST	HOST	varchar	64	192	utf8	utf8_general_ci	varchar(64)

mysql-test/t/plugin_load_option.test

@@ -3,3 +3,6 @@
 
 --error ER_PLUGIN_IS_PERMANENT
 UNINSTALL PLUGIN example;
+
+SELECT PLUGIN_NAME, PLUGIN_STATUS, LOAD_OPTION FROM INFORMATION_SCHEMA.PLUGINS
+WHERE PLUGIN_NAME IN ('MyISAM', 'EXAMPLE');

sql/sql_show.cc

@@ -211,6 +211,11 @@ static my_bool show_plugins(THD *thd, plugin_ref plugin,
   }
   table->field[9]->set_notnull();
 
+  table->field[10]->store(
+    global_plugin_typelib_names[plugin_load_option(plugin)],
+    strlen(global_plugin_typelib_names[plugin_load_option(plugin)]),
+    cs);
+
   return schema_table_store_record(thd, table);
 }
 
@@ -7214,6 +7219,7 @@ ST_FIELD_INFO plugin_fields_info[]=
   {"PLUGIN_AUTHOR", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 1, 0, SKIP_OPEN_TABLE},
   {"PLUGIN_DESCRIPTION", 65535, MYSQL_TYPE_STRING, 0, 1, 0, SKIP_OPEN_TABLE},
   {"PLUGIN_LICENSE", 80, MYSQL_TYPE_STRING, 0, 1, "License", SKIP_OPEN_TABLE},
+  {"LOAD_OPTION", 64, MYSQL_TYPE_STRING, 0, 0, 0, SKIP_OPEN_TABLE},
   {0, 0, MYSQL_TYPE_STRING, 0, 0, 0, SKIP_OPEN_TABLE}
 };