Make tests pass

- Fix bad tests in statistics_json test: make them meaningful and make them
  work on windows
- Fix analyze_debug.test: correctly handle errors during ANALYZE

mysql-test/main/statistics_json.result

@@ -3174,22 +3174,12 @@ Percentage	0.0	99.9	50	JSON_HB	{
     "99.9"
   ]
 }
-explain extended select * from Country where 'Code' between 'BBC' and 'GGG';
-id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	100.00	
-Warnings:
-Note	1003	select `world`.`Country`.`Code` AS `Code`,`world`.`Country`.`Name` AS `Name`,`world`.`Country`.`SurfaceArea` AS `SurfaceArea`,`world`.`Country`.`Population` AS `Population`,`world`.`Country`.`Capital` AS `Capital` from `world`.`Country` where 1
-analyze select * from Country where 'Code' between 'BBC' and 'GGG';
+analyze select * from Country use index () where Code between 'BBC' and 'GGG';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
-1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	239.00	100.00	100.00	
-explain extended select * from Country where 'Code' < 'BBC';
-id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
-Warnings:
-Note	1003	select `world`.`Country`.`Code` AS `Code`,`world`.`Country`.`Name` AS `Name`,`world`.`Country`.`SurfaceArea` AS `SurfaceArea`,`world`.`Country`.`Population` AS `Population`,`world`.`Country`.`Capital` AS `Capital` from `world`.`Country` where 0
-analyze select * from Country where 'Code' < 'BBC';
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	239.00	25.49	25.52	Using where
+analyze select * from Country use index () where Code < 'BBC';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	239.00	5.88	7.11	Using where
 set histogram_type=@save_histogram_type;
 set histogram_size=@save_histogram_size;
 DROP SCHEMA world;

mysql-test/main/statistics_json.test

@@ -85,10 +85,8 @@ ANALYZE TABLE Country, City, CountryLanguage persistent for all;
 --enable_result_log
 
 SELECT column_name, min_value, max_value, hist_size, hist_type, histogram FROM mysql.column_stats;
-explain extended select * from Country where 'Code' between 'BBC' and 'GGG';
-analyze select * from Country where 'Code' between 'BBC' and 'GGG';
-explain extended select * from Country where 'Code' < 'BBC';
-analyze select * from Country where 'Code' < 'BBC';
+analyze select * from Country use index () where Code between 'BBC' and 'GGG';
+analyze select * from Country use index () where Code < 'BBC';
 
 set histogram_type=@save_histogram_type;
 set histogram_size=@save_histogram_size;

sql/sql_admin.cc

@@ -1045,7 +1045,8 @@ static bool mysql_admin_table(THD* thd, TABLE_LIST* tables,
       else
         compl_result_code= HA_ADMIN_FAILED;
 
-      free_statistics_for_table(thd, table->table);
+      if (table->table)
+        free_statistics_for_table(thd, table->table);
       if (compl_result_code)
         result_code= HA_ADMIN_FAILED;
       else