Flush entries from the query cache for tables used in

administrative statements that may alter the table, such
as REPAIR TABLE. (Bug #8480)


mysql-test/r/query_cache.result:
  Add new results
mysql-test/t/query_cache.test:
  Add regression test
sql/sql_table.cc:
  Make sure entries are flushed from the query cache for
  any administrative command run on a table that acquires
  a write lock on it (and thus might change it), like 
  REPAIR TABLE.

mysql-test/r/query_cache.result

@@ -717,4 +717,24 @@ select * from t1;
 a
 drop table t1;
 drop table t1;
+set global query_cache_size=1024*1024;
+flush query cache;
+create table t1 ( a int );
+insert into t1 values (1);
+select a from t1;
+a
+1
+select a from t1;
+a
+1
+show status like 'qcache_queries_in_cache';
+Variable_name	Value
+Qcache_queries_in_cache	1
+repair table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+show status like 'qcache_queries_in_cache';
+Variable_name	Value
+Qcache_queries_in_cache	0
+drop table t1;
 set GLOBAL query_cache_size=0;

mysql-test/t/query_cache.test

@@ -533,4 +533,16 @@ select * from t1;
 drop table t1;
 drop table t1;
 
+# Bug #8480: REPAIR TABLE needs to flush the table from the query cache
+set global query_cache_size=1024*1024;
+flush query cache;
+create table t1 ( a int );
+insert into t1 values (1);
+select a from t1;
+select a from t1;
+show status like 'qcache_queries_in_cache';
+repair table t1;
+show status like 'qcache_queries_in_cache';
+drop table t1;
+
 set GLOBAL query_cache_size=0;

sql/sql_table.cc

@@ -1318,7 +1318,9 @@ static int mysql_admin_table(THD* thd, TABLE_LIST* tables,
       thd->exit_cond(old_message);
       if (thd->killed)
 	goto err;
-      open_for_modify=0;
+      /* Flush entries in the query cache involving this table. */
+      query_cache_invalidate3(thd, table->table, 0);
+      open_for_modify= 0;
     }
 
     int result_code = (table->table->file->*operator_func)(thd, check_opt);