Yet another follow-up for the 5.5 version of fix for

bug #46947 "Embedded SELECT without FOR UPDATE is causing 
a lock".

Fixed comments in tests. Improved comments and performance of
auxiliary scripts.

mysql-test/include/check_concurrent_insert.inc:
  Changed script to use temporary table for backing up data in
  order to make this operation less expensive. Made script more
  a bit generic by allowing to use multi-column tables with it.
  Improved comments.
mysql-test/include/check_no_concurrent_insert.inc:
  Changed script to use temporary table for backing up data in
  order to make this operation less expensive. Made script more
  a bit generic by allowing to use multi-column tables with it.
  Improved comments.
mysql-test/include/check_no_row_lock.inc:
  Improved comments in auxiliary script.
mysql-test/r/innodb_mysql_lock2.result:
  Fixed errors in comments for test.
mysql-test/r/lock_sync.result:
  Fixed typo in comments for test.
mysql-test/t/innodb_mysql_lock2.test:
  Fixed errors in comments for test.
mysql-test/t/lock_sync.test:
  Fixed typo in comments for test.

mysql-test/include/check_concurrent_insert.inc

@@ -10,9 +10,9 @@
 #   $con_aux2      Name of the second auxiliary connection to be used by this
 #                  script.
 #   $statement     Statement to be checked.
-#   $restore_table Table which might be modified affected by statement to be
+#   $restore_table Table which might be modified by statement to be checked
-#                  checked and thus needs backing up before its execution
+#                  and thus needs backing up before its execution and
-#                  and restoring after it (can be empty).
+#                  restoring after it (can be empty).
 #
 # EXAMPLE
 #    lock_sync.test
@@ -25,7 +25,7 @@ set debug_sync= "RESET";
 
 if (`SELECT '$restore_table' <> ''`)
 {
---eval create table t_backup select * from $restore_table;
+--eval create temporary table t_backup select * from $restore_table;
 }
 
 connection $con_aux1;
@@ -34,19 +34,19 @@ set debug_sync='after_lock_tables_takes_lock SIGNAL parked WAIT_FOR go';
 
 connection $con_aux2;
 set debug_sync='now WAIT_FOR parked';
---send_eval insert into $table values (0);
+--send_eval insert into $table (i) values (0);
 
 --enable_result_log
 --enable_query_log
 connection default;
 # Wait until concurrent insert is successfully executed while
 # statement being checked has its tables locked.
-# We use wait_condition.inc instead of simply executing
+# We use wait_condition.inc instead of simply reaping 
 # concurrent insert here in order to avoid deadlocks if test
-# fails and timing out instead.
+# fails and to time out gracefully instead.
 let $wait_condition=
   select count(*) = 0 from information_schema.processlist
-  where info = "insert into $table values (0)";
+  where info = "insert into $table (i) values (0)";
 --source include/wait_condition.inc
 
 --disable_result_log
@@ -86,7 +86,7 @@ if (`SELECT '$restore_table' <> ''`)
 {
 --eval truncate table $restore_table;
 --eval insert into $restore_table select * from t_backup;
-drop table t_backup;
+drop temporary table t_backup;
 }
 
 # Clean-up. Reset DEBUG_SYNC facility after use.

mysql-test/include/check_no_concurrent_insert.inc

@@ -10,9 +10,9 @@
 #   $con_aux2      Name of the second auxiliary connection to be used by this
 #                  script.
 #   $statement     Statement to be checked.
-#   $restore_table Table which might be modified affected by statement to be
+#   $restore_table Table which might be modified by statement to be checked
-#                  checked and thus needs backing up before its execution
+#                  and thus needs backing up before its execution and
-#                  and restoring after it (can be empty).
+#                  restoring after it (can be empty).
 #
 # EXAMPLE
 #    lock_sync.test
@@ -25,7 +25,7 @@ set debug_sync= "RESET";
 
 if (`SELECT '$restore_table' <> ''`)
 {
---eval create table t_backup select * from $restore_table;
+--eval create temporary table t_backup select * from $restore_table;
 }
 
 connection $con_aux1;
@@ -34,7 +34,7 @@ set debug_sync='after_lock_tables_takes_lock SIGNAL parked WAIT_FOR go';
 
 connection $con_aux2;
 set debug_sync='now WAIT_FOR parked';
---send_eval insert into $table values (0);
+--send_eval insert into $table (i) values (0);
 
 --enable_result_log
 --enable_query_log
@@ -43,7 +43,7 @@ connection default;
 # of our statement.
 let $wait_condition=
   select count(*) = 1 from information_schema.processlist
-  where state = "Table lock" and info = "insert into $table values (0)";
+  where state = "Table lock" and info = "insert into $table (i) values (0)";
 --source include/wait_condition.inc
 
 --disable_result_log
@@ -71,7 +71,7 @@ if (`SELECT '$restore_table' <> ''`)
 {
 --eval truncate table $restore_table;
 --eval insert into $restore_table select * from t_backup;
-drop table t_backup;
+drop temporary table t_backup;
 }
 
 # Clean-up. Reset DEBUG_SYNC facility after use.

mysql-test/include/check_no_row_lock.inc

@@ -29,9 +29,9 @@ connection default;
 # Wait until statement is successfully executed while
 # all rows in table are X-locked. This means that it
 # does not acquire any row locks.
-# We use wait_condition.inc instead of simply executing
+# We use wait_condition.inc instead of simply reaping 
 # statement here in order to avoid deadlocks if test
-# fails and timing out instead.
+# fails and to time out gracefully instead.
 let $wait_condition=
   select count(*) = 0 from information_schema.processlist
   where info = "$statement";

mysql-test/r/innodb_mysql_lock2.result

@@ -178,8 +178,7 @@ end|
 # 1.1 Simple SELECT statement.
 #
 # No locks are necessary as this statement won't be written
-# to the binary log and thanks to how MyISAM works SELECT
+# to the binary log and InnoDB supports snapshots.
-# will see version of the table prior to concurrent insert.
 Success: 'select * from t1' doesn't take row locks on 't1'.
 #
 # 1.2 Multi-UPDATE statement.
@@ -484,7 +483,7 @@ Success: 'insert into t2 values (f13((select i+10 from t1 where i=1)))' takes sh
 # row locks on the data it reads.
 Success: 'call p2(@a)' doesn't take row locks on 't1'.
 #
-# 5.2 Function that modifes data and uses CALL, 
+# 5.2 Function that modifies data and uses CALL, 
 #     which reads a table through SELECT.
 #
 # Since a call to such function is written to the binary

mysql-test/r/lock_sync.result

@@ -511,7 +511,7 @@ Success: 'insert into t2 values (f13((select i+10 from t1 where i=1)))' doesn't
 # strong locks on the data it reads.
 Success: 'call p2(@a)' allows concurrent inserts into 't1'.
 #
-# 5.2 Function that modifes data and uses CALL, 
+# 5.2 Function that modifies data and uses CALL, 
 #     which reads a table through SELECT.
 #
 # Since a call to such function is written to the binary

mysql-test/t/innodb_mysql_lock2.test

@@ -204,8 +204,7 @@ let $table= t1;
 --echo # 1.1 Simple SELECT statement.
 --echo #
 --echo # No locks are necessary as this statement won't be written
---echo # to the binary log and thanks to how MyISAM works SELECT
+--echo # to the binary log and InnoDB supports snapshots.
---echo # will see version of the table prior to concurrent insert.
 let $statement= select * from t1;
 --source include/check_no_row_lock.inc
 
@@ -659,7 +658,7 @@ let $statement= call p2(@a);
 --source include/check_no_row_lock.inc
 
 --echo #
---echo # 5.2 Function that modifes data and uses CALL, 
+--echo # 5.2 Function that modifies data and uses CALL, 
 --echo #     which reads a table through SELECT.
 --echo #
 --echo # Since a call to such function is written to the binary

mysql-test/t/lock_sync.test

@@ -716,7 +716,7 @@ let $restore_table= ;
 --source include/check_concurrent_insert.inc
 
 --echo #
---echo # 5.2 Function that modifes data and uses CALL, 
+--echo # 5.2 Function that modifies data and uses CALL, 
 --echo #     which reads a table through SELECT.
 --echo #
 --echo # Since a call to such function is written to the binary