Fixes bug #14902. When analysing a table with FT index that contains stopwords

table statistics is not updated, so the next execution of analyze table will
try to update statistics again.

myisam/mi_check.c

@@ -402,7 +402,7 @@ int chk_key(MI_CHECK *param, register MI_INFO *info)
       full_text_keys++;
     if (share->state.key_root[key] == HA_OFFSET_ERROR &&
 	(info->state->records == 0 || keyinfo->flag & HA_FULLTEXT))
-      continue;
+      goto do_stat;
     if (!_mi_fetch_keypage(info,keyinfo,share->state.key_root[key],
                            DFLT_INIT_HITS,info->buff,0))
     {
@@ -498,6 +498,7 @@ int chk_key(MI_CHECK *param, register MI_INFO *info)
 	     param->max_level);
     all_keydata+=param->keydata; all_totaldata+=param->totaldata; key_totlength+=length;
 
+do_stat:
     if (param->testflag & T_STATISTICS)
       update_key_parts(keyinfo, rec_per_key_part, param->unique_count,
                        param->stats_method == MI_STATS_METHOD_IGNORE_NULLS?

mysql-test/r/analyze.result

@@ -30,3 +30,12 @@ check table t1;
 Table	Op	Msg_type	Msg_text
 test.t1	check	status	OK
 drop table t1;
+create table t1 (a mediumtext, fulltext key key1(a)) charset utf8 collate utf8_general_ci engine myisam;
+insert into t1 values ('hello');
+analyze table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	OK
+analyze table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	Table is already up to date
+drop table t1;

mysql-test/t/analyze.test

@@ -39,4 +39,18 @@ check table t1;
 
 drop table t1;
 
+# Bug #14902 ANALYZE TABLE fails to recognize up-to-date tables
+# minimal test case to get an error.
+# The problem is happening when analysing table with FT index that
+# contains stopwords only. The first execution of analyze table should
+# mark index statistics as up to date so that next execution of this
+# statement will end up with Table is up to date status.
+create table t1 (a mediumtext, fulltext key key1(a)) charset utf8 collate utf8_general_ci engine myisam;
+insert into t1 values ('hello');
+
+analyze table t1;
+analyze table t1;
+
+drop table t1;
+
 # End of 4.1 tests