Fix test cases to preserve the state that existed before the

test case was executed.

mysql-test/r/func_compress.result:
  Update test case result.
mysql-test/r/innodb_bug34300.result:
  Update test case result.
mysql-test/t/func_compress.test:
  Disconnect connection and reset max_allowed_packet to it's
  default value.
mysql-test/t/innodb_bug34300.test:
  Disconnect connection and reset max_allowed_packet to it's
  default value and enable query log.

mysql-test/r/func_compress.result

@@ -72,6 +72,7 @@ set @@global.max_allowed_packet=1048576*100;
 select compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null;
 compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null
 0
+set @@global.max_allowed_packet=default;
 create table t1(a blob);
 insert into t1 values(NULL), (compress('a'));
 select uncompress(a), uncompressed_length(a) from t1;

mysql-test/r/innodb_bug34300.result

+SELECT f4, f8 FROM bug34300;
 f4	f8
 xxx	zzz
+ALTER TABLE bug34300 ADD COLUMN (f10 INT);
+SELECT f4, f8 FROM bug34300;
 f4	f8
 xxx	zzz
+DROP TABLE bug34300;
+SET @@global.max_allowed_packet=default;

mysql-test/t/func_compress.test

@@ -49,6 +49,9 @@ set @@global.max_allowed_packet=1048576*100;
 # reconnect to make the new max packet size take effect
 --connect (newconn, localhost, root,,)
 eval select compress(repeat('aaaaaaaaaa', IF('$LOW_MEMORY', 10, 10000000))) is null;
+disconnect newconn;
+connection default;
+set @@global.max_allowed_packet=default;
 
 #
 # Bug #18643: problem with null values

mysql-test/t/innodb_bug34300.test

@@ -21,6 +21,7 @@ CREATE TABLE bug34300 (
 
 INSERT INTO bug34300 VALUES ('xxx', repeat('a', 8459264), 'zzz');
 
+-- enable_query_log
 -- enable_result_log
 
 SELECT f4, f8 FROM bug34300;
@@ -30,3 +31,7 @@ ALTER TABLE bug34300 ADD COLUMN (f10 INT);
 SELECT f4, f8 FROM bug34300;
 
 DROP TABLE bug34300;
+
+disconnect newconn;
+connection default;
+SET @@global.max_allowed_packet=default;