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mariadb/mysql-test/main/mysqlbinlog_row_minimal.result
Andrei Elkin caa35f8e25 MDEV-16372 ER_BASE64_DECODE_ERROR upon replaying binary log via mysqlbinlog --verbose 
(This commit is for 10.3 and upper branches)

In case of a pattern of non-STMT_END-marked Rows-log-event (A) followed by
a STMT_END marked one (B) mysqlbinlog mixes up the base64 encoded rows events
with their pseudo sql representation produced by the verbose option:
      BINLOG '
        base64 encoded data for A
        ### verbose section for A
        base64 encoded data for B
        ### verbose section for B
      '/*!*/;
In effect the produced BINLOG '...' query is not valid and is rejected with the error.
Examples of this way malformed BINLOG could have been found in binlog_row_annotate.result
that gets corrected with the patch.

The issue is fixed with introduction an auxiliary IO_CACHE to hold on the verbose
comments until the terminal STMT_END event is found. The new cache is emptied
out after two pre-existing ones are done at that time.
The correctly produced output now for the above case is as the following:
      BINLOG '
        base64 encoded data for A
        base64 encoded data for B
      '/*!*/;
        ### verbose section for A
        ### verbose section for B

Thanks to Alexey Midenkov for the problem recognition and attempt to tackle,
and to Venkatesh Duggirala who produced a patch for the upstream whose
idea is exploited here, as well as to MDEV-23077 reporter LukeXwang who
also contributed a piece of a patch aiming at this issue.
2020-08-31 18:38:57 +03:00

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CREATE TABLE t1 (pk INT PRIMARY KEY, f1 INT, f2 INT, f3 TINYINT, f4 MEDIUMINT, f5 BIGINT, f6 INT, f7 INT, f8 char(1));
CREATE TABLE t2 (pk INT PRIMARY KEY, f1 INT, f2 INT, f3 INT, f4 INT, f5 MEDIUMINT, f6 INT, f7 INT, f8 char(1));
INSERT INTO t1 VALUES (10, 1, 2, 3, 4, 5, 6, 7, "");
INSERT INTO t1 VALUES (11, 1, 2, 3, 4, 5, 6, 7, NULL);
INSERT INTO t1 VALUES (12, 1, 2, 3, NULL, 5, 6, 7, "A");
INSERT INTO t1 VALUES (13, 1, 2, 3, 0, 5, 6, 7, "A");
INSERT INTO t2 SELECT * FROM t1;
UPDATE t2 SET f4=5 WHERE f4>0 or f4 is NULL;
DELETE FROM t1;
DELETE FROM t2;
FLUSH BINARY LOGS;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#<date> server id 1 end_log_pos 256 CRC32 XXX Start: xxx
ROLLBACK/*!*/;
# at 256
#<date> server id 1 end_log_pos 285 CRC32 XXX Gtid list []
# at 285
#<date> server id 1 end_log_pos 329 CRC32 XXX Binlog checkpoint master-bin.000001
# at 329
#<date> server id 1 end_log_pos 371 CRC32 XXX GTID 0-1-1 ddl
/*!100101 SET @@session.skip_parallel_replication=0*//*!*/;
/*!100001 SET @@session.gtid_domain_id=0*//*!*/;
/*!100001 SET @@session.server_id=1*//*!*/;
/*!100001 SET @@session.gtid_seq_no=1*//*!*/;
# at 371
#<date> server id 1 end_log_pos 555 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
use `test`/*!*/;
SET TIMESTAMP=X/*!*/;
SET @@session.pseudo_thread_id=5/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1, @@session.check_constraint_checks=1/*!*/;
SET @@session.sql_mode=#/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C latin1 *//*!*/;
SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=#/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
CREATE TABLE t1 (pk INT PRIMARY KEY, f1 INT, f2 INT, f3 TINYINT, f4 MEDIUMINT, f5 BIGINT, f6 INT, f7 INT, f8 char(1))
/*!*/;
# at 555
#<date> server id 1 end_log_pos 597 CRC32 XXX GTID 0-1-2 ddl
/*!100001 SET @@session.gtid_seq_no=2*//*!*/;
# at 597
#<date> server id 1 end_log_pos 774 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
CREATE TABLE t2 (pk INT PRIMARY KEY, f1 INT, f2 INT, f3 INT, f4 INT, f5 MEDIUMINT, f6 INT, f7 INT, f8 char(1))
/*!*/;
# at 774
#<date> server id 1 end_log_pos 816 CRC32 XXX GTID 0-1-3
/*!100001 SET @@session.gtid_seq_no=3*//*!*/;
START TRANSACTION
/*!*/;
# at 816
# at 890
#<date> server id 1 end_log_pos 890 CRC32 XXX Annotate_rows:
#Q> INSERT INTO t1 VALUES (10, 1, 2, 3, 4, 5, 6, 7, "")
#<date> server id 1 end_log_pos 946 CRC32 XXX Table_map: `test`.`t1` mapped to number num
# at 946
#<date> server id 1 end_log_pos 1015 CRC32 XXX Write_rows: table id 32 flags: STMT_END_F
### INSERT INTO `test`.`t1`
### SET
### @1=10 /* INT meta=0 nullable=0 is_null=0 */
### @2=1 /* INT meta=0 nullable=1 is_null=0 */
### @3=2 /* INT meta=0 nullable=1 is_null=0 */
### @4=3 /* TINYINT meta=0 nullable=1 is_null=0 */
### @5=4 /* MEDIUMINT meta=0 nullable=1 is_null=0 */
### @6=5 /* LONGINT meta=0 nullable=1 is_null=0 */
### @7=6 /* INT meta=0 nullable=1 is_null=0 */
### @8=7 /* INT meta=0 nullable=1 is_null=0 */
### @9='' /* STRING(1) meta=65025 nullable=1 is_null=0 */
# Number of rows: 1
# at 1015
#<date> server id 1 end_log_pos 1088 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
COMMIT
/*!*/;
# at 1088
#<date> server id 1 end_log_pos 1130 CRC32 XXX GTID 0-1-4
/*!100001 SET @@session.gtid_seq_no=4*//*!*/;
START TRANSACTION
/*!*/;
# at 1130
# at 1206
#<date> server id 1 end_log_pos 1206 CRC32 XXX Annotate_rows:
#Q> INSERT INTO t1 VALUES (11, 1, 2, 3, 4, 5, 6, 7, NULL)
#<date> server id 1 end_log_pos 1262 CRC32 XXX Table_map: `test`.`t1` mapped to number num
# at 1262
#<date> server id 1 end_log_pos 1330 CRC32 XXX Write_rows: table id 32 flags: STMT_END_F
### INSERT INTO `test`.`t1`
### SET
### @1=11 /* INT meta=0 nullable=0 is_null=0 */
### @2=1 /* INT meta=0 nullable=1 is_null=0 */
### @3=2 /* INT meta=0 nullable=1 is_null=0 */
### @4=3 /* TINYINT meta=0 nullable=1 is_null=0 */
### @5=4 /* MEDIUMINT meta=0 nullable=1 is_null=0 */
### @6=5 /* LONGINT meta=0 nullable=1 is_null=0 */
### @7=6 /* INT meta=0 nullable=1 is_null=0 */
### @8=7 /* INT meta=0 nullable=1 is_null=0 */
### @9=NULL /* STRING(1) meta=65025 nullable=1 is_null=1 */
# Number of rows: 1
# at 1330
#<date> server id 1 end_log_pos 1403 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
COMMIT
/*!*/;
# at 1403
#<date> server id 1 end_log_pos 1445 CRC32 XXX GTID 0-1-5
/*!100001 SET @@session.gtid_seq_no=5*//*!*/;
START TRANSACTION
/*!*/;
# at 1445
# at 1523
#<date> server id 1 end_log_pos 1523 CRC32 XXX Annotate_rows:
#Q> INSERT INTO t1 VALUES (12, 1, 2, 3, NULL, 5, 6, 7, "A")
#<date> server id 1 end_log_pos 1579 CRC32 XXX Table_map: `test`.`t1` mapped to number num
# at 1579
#<date> server id 1 end_log_pos 1646 CRC32 XXX Write_rows: table id 32 flags: STMT_END_F
### INSERT INTO `test`.`t1`
### SET
### @1=12 /* INT meta=0 nullable=0 is_null=0 */
### @2=1 /* INT meta=0 nullable=1 is_null=0 */
### @3=2 /* INT meta=0 nullable=1 is_null=0 */
### @4=3 /* TINYINT meta=0 nullable=1 is_null=0 */
### @5=NULL /* MEDIUMINT meta=0 nullable=1 is_null=1 */
### @6=5 /* LONGINT meta=0 nullable=1 is_null=0 */
### @7=6 /* INT meta=0 nullable=1 is_null=0 */
### @8=7 /* INT meta=0 nullable=1 is_null=0 */
### @9='A' /* STRING(1) meta=65025 nullable=1 is_null=0 */
# Number of rows: 1
# at 1646
#<date> server id 1 end_log_pos 1719 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
COMMIT
/*!*/;
# at 1719
#<date> server id 1 end_log_pos 1761 CRC32 XXX GTID 0-1-6
/*!100001 SET @@session.gtid_seq_no=6*//*!*/;
START TRANSACTION
/*!*/;
# at 1761
# at 1836
#<date> server id 1 end_log_pos 1836 CRC32 XXX Annotate_rows:
#Q> INSERT INTO t1 VALUES (13, 1, 2, 3, 0, 5, 6, 7, "A")
#<date> server id 1 end_log_pos 1892 CRC32 XXX Table_map: `test`.`t1` mapped to number num
# at 1892
#<date> server id 1 end_log_pos 1962 CRC32 XXX Write_rows: table id 32 flags: STMT_END_F
### INSERT INTO `test`.`t1`
### SET
### @1=13 /* INT meta=0 nullable=0 is_null=0 */
### @2=1 /* INT meta=0 nullable=1 is_null=0 */
### @3=2 /* INT meta=0 nullable=1 is_null=0 */
### @4=3 /* TINYINT meta=0 nullable=1 is_null=0 */
### @5=0 /* MEDIUMINT meta=0 nullable=1 is_null=0 */
### @6=5 /* LONGINT meta=0 nullable=1 is_null=0 */
### @7=6 /* INT meta=0 nullable=1 is_null=0 */
### @8=7 /* INT meta=0 nullable=1 is_null=0 */
### @9='A' /* STRING(1) meta=65025 nullable=1 is_null=0 */
# Number of rows: 1
# at 1962
#<date> server id 1 end_log_pos 2035 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
COMMIT
/*!*/;
# at 2035
#<date> server id 1 end_log_pos 2077 CRC32 XXX GTID 0-1-7
/*!100001 SET @@session.gtid_seq_no=7*//*!*/;
START TRANSACTION
/*!*/;
# at 2077
# at 2131
#<date> server id 1 end_log_pos 2131 CRC32 XXX Annotate_rows:
#Q> INSERT INTO t2 SELECT * FROM t1
#<date> server id 1 end_log_pos 2187 CRC32 XXX Table_map: `test`.`t2` mapped to number num
# at 2187
#<date> server id 1 end_log_pos 2354 CRC32 XXX Write_rows: table id 33 flags: STMT_END_F
### INSERT INTO `test`.`t2`
### SET
### @1=10 /* INT meta=0 nullable=0 is_null=0 */
### @2=1 /* INT meta=0 nullable=1 is_null=0 */
### @3=2 /* INT meta=0 nullable=1 is_null=0 */
### @4=3 /* INT meta=0 nullable=1 is_null=0 */
### @5=4 /* INT meta=0 nullable=1 is_null=0 */
### @6=5 /* MEDIUMINT meta=0 nullable=1 is_null=0 */
### @7=6 /* INT meta=0 nullable=1 is_null=0 */
### @8=7 /* INT meta=0 nullable=1 is_null=0 */
### @9='' /* STRING(1) meta=65025 nullable=1 is_null=0 */
### INSERT INTO `test`.`t2`
### SET
### @1=11 /* INT meta=0 nullable=0 is_null=0 */
### @2=1 /* INT meta=0 nullable=1 is_null=0 */
### @3=2 /* INT meta=0 nullable=1 is_null=0 */
### @4=3 /* INT meta=0 nullable=1 is_null=0 */
### @5=4 /* INT meta=0 nullable=1 is_null=0 */
### @6=5 /* MEDIUMINT meta=0 nullable=1 is_null=0 */
### @7=6 /* INT meta=0 nullable=1 is_null=0 */
### @8=7 /* INT meta=0 nullable=1 is_null=0 */
### @9=NULL /* STRING(1) meta=65025 nullable=1 is_null=1 */
### INSERT INTO `test`.`t2`
### SET
### @1=12 /* INT meta=0 nullable=0 is_null=0 */
### @2=1 /* INT meta=0 nullable=1 is_null=0 */
### @3=2 /* INT meta=0 nullable=1 is_null=0 */
### @4=3 /* INT meta=0 nullable=1 is_null=0 */
### @5=NULL /* INT meta=0 nullable=1 is_null=1 */
### @6=5 /* MEDIUMINT meta=0 nullable=1 is_null=0 */
### @7=6 /* INT meta=0 nullable=1 is_null=0 */
### @8=7 /* INT meta=0 nullable=1 is_null=0 */
### @9='A' /* STRING(1) meta=65025 nullable=1 is_null=0 */
### INSERT INTO `test`.`t2`
### SET
### @1=13 /* INT meta=0 nullable=0 is_null=0 */
### @2=1 /* INT meta=0 nullable=1 is_null=0 */
### @3=2 /* INT meta=0 nullable=1 is_null=0 */
### @4=3 /* INT meta=0 nullable=1 is_null=0 */
### @5=0 /* INT meta=0 nullable=1 is_null=0 */
### @6=5 /* MEDIUMINT meta=0 nullable=1 is_null=0 */
### @7=6 /* INT meta=0 nullable=1 is_null=0 */
### @8=7 /* INT meta=0 nullable=1 is_null=0 */
### @9='A' /* STRING(1) meta=65025 nullable=1 is_null=0 */
# Number of rows: 4
# at 2354
#<date> server id 1 end_log_pos 2427 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
COMMIT
/*!*/;
# at 2427
#<date> server id 1 end_log_pos 2469 CRC32 XXX GTID 0-1-8
/*!100001 SET @@session.gtid_seq_no=8*//*!*/;
START TRANSACTION
/*!*/;
# at 2469
# at 2535
#<date> server id 1 end_log_pos 2535 CRC32 XXX Annotate_rows:
#Q> UPDATE t2 SET f4=5 WHERE f4>0 or f4 is NULL
#<date> server id 1 end_log_pos 2591 CRC32 XXX Table_map: `test`.`t2` mapped to number num
# at 2591
#<date> server id 1 end_log_pos 2657 CRC32 XXX Update_rows: table id 33 flags: STMT_END_F
### UPDATE `test`.`t2`
### WHERE
### @1=10 /* INT meta=0 nullable=0 is_null=0 */
### SET
### @5=5 /* INT meta=0 nullable=1 is_null=0 */
### UPDATE `test`.`t2`
### WHERE
### @1=11 /* INT meta=0 nullable=0 is_null=0 */
### SET
### @5=5 /* INT meta=0 nullable=1 is_null=0 */
### UPDATE `test`.`t2`
### WHERE
### @1=12 /* INT meta=0 nullable=0 is_null=0 */
### SET
### @5=5 /* INT meta=0 nullable=1 is_null=0 */
# Number of rows: 3
# at 2657
#<date> server id 1 end_log_pos 2730 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
COMMIT
/*!*/;
# at 2730
#<date> server id 1 end_log_pos 2772 CRC32 XXX GTID 0-1-9
/*!100001 SET @@session.gtid_seq_no=9*//*!*/;
START TRANSACTION
/*!*/;
# at 2772
# at 2809
#<date> server id 1 end_log_pos 2809 CRC32 XXX Annotate_rows:
#Q> DELETE FROM t1
#<date> server id 1 end_log_pos 2865 CRC32 XXX Table_map: `test`.`t1` mapped to number num
# at 2865
#<date> server id 1 end_log_pos 2919 CRC32 XXX Delete_rows: table id 32 flags: STMT_END_F
### DELETE FROM `test`.`t1`
### WHERE
### @1=10 /* INT meta=0 nullable=0 is_null=0 */
### DELETE FROM `test`.`t1`
### WHERE
### @1=11 /* INT meta=0 nullable=0 is_null=0 */
### DELETE FROM `test`.`t1`
### WHERE
### @1=12 /* INT meta=0 nullable=0 is_null=0 */
### DELETE FROM `test`.`t1`
### WHERE
### @1=13 /* INT meta=0 nullable=0 is_null=0 */
# Number of rows: 4
# at 2919
#<date> server id 1 end_log_pos 2992 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
COMMIT
/*!*/;
# at 2992
#<date> server id 1 end_log_pos 3034 CRC32 XXX GTID 0-1-10
/*!100001 SET @@session.gtid_seq_no=10*//*!*/;
START TRANSACTION
/*!*/;
# at 3034
# at 3071
#<date> server id 1 end_log_pos 3071 CRC32 XXX Annotate_rows:
#Q> DELETE FROM t2
#<date> server id 1 end_log_pos 3127 CRC32 XXX Table_map: `test`.`t2` mapped to number num
# at 3127
#<date> server id 1 end_log_pos 3181 CRC32 XXX Delete_rows: table id 33 flags: STMT_END_F
### DELETE FROM `test`.`t2`
### WHERE
### @1=10 /* INT meta=0 nullable=0 is_null=0 */
### DELETE FROM `test`.`t2`
### WHERE
### @1=11 /* INT meta=0 nullable=0 is_null=0 */
### DELETE FROM `test`.`t2`
### WHERE
### @1=12 /* INT meta=0 nullable=0 is_null=0 */
### DELETE FROM `test`.`t2`
### WHERE
### @1=13 /* INT meta=0 nullable=0 is_null=0 */
# Number of rows: 4
# at 3181
#<date> server id 1 end_log_pos 3254 CRC32 XXX Query thread_id=5 exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
COMMIT
/*!*/;
# at 3254
#<date> server id 1 end_log_pos 3302 CRC32 XXX Rotate to master-bin.000002 pos: 4
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;
DROP TABLE t1,t2;
#
# MDEV-16372 ER_BASE64_DECODE_ERROR upon replaying binary log with system table
#
FLUSH BINARY LOGS;
CREATE TABLE t1 (pk INT PRIMARY KEY);
INSERT INTO t1 VALUES (1);
INSERT INTO t1 VALUES (1), (2) ON DUPLICATE KEY UPDATE pk= pk + 10;
FLUSH BINARY LOGS;
Proof: two subsequent patterns must be found
FOUND 1 /### UPDATE `test`.`t1`/ in mysqlbinlog.sql
FOUND 2 /### INSERT INTO `test`.`t1`/ in mysqlbinlog.sql
DROP TABLE t1;
SELECT * FROM t1;
pk
2
11
# Cleanup
DROP TABLE t1;
CREATE TABLE `t1` (
`id` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
`is_deleted` BIT(1) DEFAULT b'0',
`last_updated` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`ref_id` BIGINT(20) UNSIGNED NOT NULL,
PRIMARY KEY (`id`),
KEY `last_updated_KEY` (`last_updated`)
);
CREATE TABLE `t2` (
`id` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
`short_desc` VARCHAR(50) NOT NULL,
PRIMARY KEY (`id`)
);
INSERT INTO t2 (id, short_desc) VALUES (1, 'test');
INSERT INTO t1 (id, is_deleted, ref_id) VALUES (1, b'0', 1);
FLUSH BINARY LOGS;
UPDATE t1 t1 INNER JOIN t2 t2 ON t1.ref_id = t2.id
SET t1.is_deleted = TRUE
WHERE t1.id = 1;
FLUSH BINARY LOGS;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at POS
#<date> server id 1 end_log_pos END_LOG_POS CRC32 XXX GTID D-S-N
/*!100101 SET @@session.skip_parallel_replication=0*//*!*/;
/*!100001 SET @@session.gtid_domain_id=0*//*!*/;
/*!100001 SET @@session.server_id=1*//*!*/;
/*!100001 SET @@session.gtid_seq_no=21*//*!*/;
START TRANSACTION
/*!*/;
# at POS
# at POS
#<date> server id 1 end_log_pos END_LOG_POS CRC32 XXX Annotate_rows:
#Q> UPDATE t1 t1 INNER JOIN t2 t2 ON t1.ref_id = t2.id
#Q> SET t1.is_deleted = TRUE
#Q> WHERE t1.id =
#<date> server id 1 end_log_pos END_LOG_POS CRC32 XXX Table_map: `test`.`t1` mapped to number TID
# at POS
#<date> server id 1 end_log_pos END_LOG_POS CRC32 XXX Update_rows: table id TID flags: STMT_END_F
### UPDATE `test`.`t1`
### WHERE
### @1=1 /* LONGINT meta=0 nullable=0 is_null=0 */
### SET
### @2=b'1' /* BIT(1) meta=1 nullable=1 is_null=0 */
### @3=X /* TIMESTAMP(0) meta=0 nullable=0 is_null=0 */
# Number of rows: 1
# at POS
#<date> server id 1 end_log_pos END_LOG_POS CRC32 XXX Query thread_id=TID exec_time=x error_code=0
SET TIMESTAMP=X/*!*/;
SET @@session.pseudo_thread_id=TID/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1, @@session.check_constraint_checks=1/*!*/;
SET @@session.sql_mode=#/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C latin1 *//*!*/;
SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=#/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
COMMIT
/*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;
DROP TABLE t1,t2;
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