Fixed a bug checksum table locks the InnoDB table and does not use a

consistent read (Bug #12669). This fixes InnoDB part of the bug.

mysql-test/r/innodb.result

@@ -2616,3 +2616,31 @@ SET FOREIGN_KEY_CHECKS=1;
 INSERT INTO t2 VALUES(3);
 ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test/t2`, CONSTRAINT `c1` FOREIGN KEY (`v`) REFERENCES `t1` (`id`))
 DROP TABLE t2;
+create table test_checksum(a int not null) engine=innodb DEFAULT CHARSET=latin1;
+insert into test_checksum values (1),(2);
+set autocommit=0;
+checksum table test_checksum;
+Table	Checksum
+test.test_checksum	1531596814
+insert into test_checksum values(3);
+checksum table test_checksum;
+Table	Checksum
+test.test_checksum	1531596814
+commit;
+checksum table test_checksum;
+Table	Checksum
+test.test_checksum	2050879373
+commit;
+drop table test_checksum;
+create table test_checksum(a int not null) engine=innodb DEFAULT CHARSET=latin1;
+insert into test_checksum values (1),(2);
+set autocommit=1;
+checksum table test_checksum;
+Table	Checksum
+test.test_checksum	1531596814
+set autocommit=1;
+insert into test_checksum values(3);
+checksum table test_checksum;
+Table	Checksum
+test.test_checksum	2050879373
+drop table test_checksum;

mysql-test/t/innodb.test

@@ -1564,3 +1564,42 @@ SET FOREIGN_KEY_CHECKS=1;
 INSERT INTO t2 VALUES(3);
 
 DROP TABLE t2;
+#
+# Test that checksum table uses a consistent read Bug #12669
+#
+connect (a,localhost,root,,);
+connect (b,localhost,root,,);
+connection a;
+create table test_checksum(a int not null) engine=innodb DEFAULT CHARSET=latin1;
+insert into test_checksum values (1),(2);
+set autocommit=0;
+checksum table test_checksum;
+connection b;
+insert into test_checksum values(3);
+connection a;
+#
+# Here checksum should not see insert
+#
+checksum table test_checksum;
+connection a;
+commit;
+checksum table test_checksum;
+commit;
+drop table test_checksum;
+#
+# autocommit = 1
+#
+connection a;
+create table test_checksum(a int not null) engine=innodb DEFAULT CHARSET=latin1;
+insert into test_checksum values (1),(2);
+set autocommit=1;
+checksum table test_checksum;
+connection b;
+set autocommit=1;
+insert into test_checksum values(3);
+connection a;
+#
+# Here checksum sees insert
+#
+checksum table test_checksum;
+drop table test_checksum;

sql/ha_innodb.cc

@@ -6686,6 +6686,11 @@ ha_innobase::store_lock(
 			without FOR UPDATE or IN SHARE MODE in select, then
 			we use consistent read for select. */
 
+			prebuilt->select_lock_type = LOCK_NONE;
+			prebuilt->stored_select_lock_type = LOCK_NONE;
+		} else if (thd->lex->sql_command == SQLCOM_CHECKSUM) {
+			/* Use consistent read for checksum table */
+
 			prebuilt->select_lock_type = LOCK_NONE;
 			prebuilt->stored_select_lock_type = LOCK_NONE;
 		} else {