Create 'main' test directory and move 't' and 'r' there

mysql-test/main/stat_tables_innodb_debug.test

@@ -0,0 +1,36 @@
+--source include/have_innodb.inc
+--source include/have_sequence.inc
+--source include/have_stat_tables.inc
+--source include/have_debug_sync.inc
+--source include/not_embedded.inc
+
+--echo # 
+--echo # MDEV-7901: re-implement analyze table for low impact
+--echo # 
+
+create table t1 (a int, b int, c int, key IDX1(a), key IDX2(a,b)) engine=innodb;
+insert into t1 select seq/10, seq/2, seq from seq_0_to_9;
+
+
+SET DEBUG_SYNC='statistics_collection_start1 SIGNAL analyzing WAIT_FOR written';
+
+send analyze table t1 persistent for all;
+connect (con1, localhost, root,,);
+--connection con1
+
+SET DEBUG_SYNC= 'now WAIT_FOR analyzing';
+
+select count(*) from t1;
+# insert will work even with MyISAM because it allow to append file
+insert into t1 values (333,333,333);
+# but update now hang for MyISAM bacause can't get lock (InnoDB/XtraDB works)
+update t1 set a=1;
+
+SET DEBUG_SYNC= 'now SIGNAL written';
+
+--connection default
+--reap
+select count(*) from t1;
+
+set debug_sync='RESET';
+drop table t1;