MDEV-6720 - enable connection log in mysqltest by default

mysql-test/t/truncate_coverage.test

@@ -27,16 +27,12 @@ INSERT INTO t1 VALUES (1);
 # TRUNCATE shall block on this metadata lock.
 # We can't use normal DML as such statements would also block LOCK TABLES.
 #
---echo #
---echo # connection con1
 --connect (con1, localhost, root,,)
 HANDLER t1 OPEN;
 #
 # Get connection id of default connection.
 # Lock the table and start TRUNCATE, which will block on MDL upgrade.
 #
---echo #
---echo # connection default
 --connection default
 let $ID= `SELECT @id := CONNECTION_ID()`;
 LOCK TABLE t1 WRITE;
@@ -47,27 +43,19 @@ send TRUNCATE TABLE t1;
 # Kill the TRUNCATE query. This shall result in an error return
 # from wait_while_table_is_used().
 #
---echo #
---echo # connection con2
 --connect (con2, localhost, root,,)
 SET DEBUG_SYNC='now WAIT_FOR waiting';
 let $invisible_assignment_in_select = `SELECT @id := $ID`;
 KILL QUERY @id;
 --disconnect con2
---echo #
---echo # connection default
 --connection default
 --error ER_QUERY_INTERRUPTED
 reap;
 UNLOCK TABLES;
---echo #
---echo # connection con1
 --connection con1
 --echo # Release shared metadata lock by closing HANDLER.
 HANDLER t1 CLOSE;
 --disconnect con1
---echo #
---echo # connection default
 --connection default
 DROP TABLE t1;
 SET DEBUG_SYNC='RESET';
@@ -81,15 +69,11 @@ INSERT INTO t1 VALUES (1);
 # TRUNCATE shall block on this metadata lock.
 # We can't use normal DML as such statements would also block LOCK TABLES.
 #
---echo #
---echo # connection con1
 --connect (con1, localhost, root,,)
 HANDLER t1 OPEN;
 #
 # Lock the table and start TRUNCATE, which will block on MDL upgrade.
 #
---echo #
---echo # connection default
 --connection default
 LOCK TABLE t1 WRITE;
 SET DEBUG_SYNC='mdl_upgrade_lock SIGNAL waiting';
@@ -98,19 +82,13 @@ send TRUNCATE TABLE t1;
 # Remove datafile.
 # Commit to let TRUNCATE continue.
 #
---echo #
---echo # connection con2
 --connect (con2, localhost, root,,)
 SET DEBUG_SYNC='now WAIT_FOR waiting';
 --remove_file $MYSQLD_DATADIR/test/t1.frm
 --disconnect con2
---echo #
---echo # connection con1
 --connection con1
 HANDLER t1 CLOSE;
 --disconnect con1
---echo #
---echo # connection default
 --connection default
 --error ER_NO_SUCH_TABLE
 reap;
@@ -128,8 +106,6 @@ INSERT INTO t1 VALUES (1);
 # Start a transaction and execute a DML in it. Since 5.4.4 this leaves
 # a shared meta data lock (MDL) behind. TRUNCATE shall block on it.
 #
---echo #
---echo # connection con1
 --connect (con1, localhost, root,,)
 START TRANSACTION;
 INSERT INTO t1 VALUES (2);
@@ -137,8 +113,6 @@ INSERT INTO t1 VALUES (2);
 # Get connection id of default connection.
 # Start TRUNCATE, which will block on acquire_exclusive_locks().
 #
---echo #
---echo # connection default
 --connection default
 let $ID= `SELECT @id := CONNECTION_ID()`;
 SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL waiting';
@@ -148,25 +122,17 @@ send TRUNCATE TABLE t1;
 # Kill the TRUNCATE query. This shall result in an error return
 # from wait_while_table_is_used().
 #
---echo #
---echo # connection con1
 --connection con1
 SET DEBUG_SYNC='now WAIT_FOR waiting';
 let $invisible_assignment_in_select = `SELECT @id := $ID`;
 KILL QUERY @id;
---echo #
---echo # connection default
 --connection default
 --error ER_QUERY_INTERRUPTED
 reap;
---echo #
---echo # connection con1
 --connection con1
 --echo # Release SW lock by committing transaction.
 COMMIT;
 --disconnect con1
---echo #
---echo # connection default
 --connection default
 UNLOCK TABLES;
 DROP TABLE t1;
@@ -187,19 +153,16 @@ CREATE TABLE t1(a INT) engine=memory;
 CREATE TABLE m1(a INT) engine=merge UNION(t1);
 connect(con2, localhost, root);
 
---echo # Connection con1
 connect(con1, localhost, root);
 SET DEBUG_SYNC= 'open_tables_after_open_and_process_table SIGNAL opened WAIT_FOR dropped';
 --echo # Sending:
 --send TRUNCATE TABLE m1
 
---echo # Connection con2
 connection con2;
 SET DEBUG_SYNC= 'now WAIT_FOR opened';
 --echo # Sending:
 --send FLUSH TABLES
 
---echo # Connection default
 connection default;
 --echo # Waiting for FLUSH TABLES to be blocked.
 let $wait_condition= SELECT COUNT(*)=1 FROM information_schema.processlist
@@ -207,7 +170,6 @@ let $wait_condition= SELECT COUNT(*)=1 FROM information_schema.processlist
 --source include/wait_condition.inc
 SET DEBUG_SYNC= 'now SIGNAL dropped';
 
---echo # Connection con1
 connection con1;
 --echo # Reaping: TRUNCATE TABLE m1
 --error ER_WRONG_MRG_TABLE
@@ -215,14 +177,12 @@ connection con1;
 disconnect con1;
 --source include/wait_until_disconnected.inc
 
---echo # Connection con2
 connection con2;
 --echo # Reaping: FLUSH TABLES
 --reap
 disconnect con2;
 --source include/wait_until_disconnected.inc
 
---echo # Connection default
 connection default;
 SET DEBUG_SYNC= 'RESET';
 DROP TABLE m1, t1;