MDEV-21786 mysqldump will forget sequence definition details on --no-data dump

- Original patch was contributed by Jani Tolonen <jani.k.tolonen@gmail.com>
https://github.com/an3l/server/commits/bb-10.3-anel-MDEV-21786-dump-sequence
which distinguishes data structure (linked list) of sequences from
tables.
- Added standard sql output to prevent future changes
of sequences and disabled locks for sequences.
- Added test case for `MDEV-20070: mysqldump won't work correct on
sequences` where table column depends on sequence value.
- Restore sequence last value in the following way:
  - Find `next_not_cached_value` and use it to `setval()`
  - We just need for logical restore, so don't execute `setval()`
  - `setval()` should be showed also in case of `--no-data` option.

Reviewed-by: daniel@mariadb.org

1 files changed, 118 insertions, 0 deletions

diff --git a/mysql-test/main/mysqldump.result b/mysql-test/main/mysqldump.result
index 5f3f0d89593..622ef745859 100644
--- a/mysql-test/main/mysqldump.result
+++ b/mysql-test/main/mysqldump.result
@@ -5904,4 +5904,122 @@ invisible	int(11)	YES		NULL
 a  b c & $!@#$%^&*( )	int(11)	YES		4	INVISIBLE
 ds=~!@ \# $% ^ & * ( ) _ - = +	int(11)	YES		5	INVISIBLE
 drop database d;
+#
+# MDEV-21786:
+# mysqldump will forget sequence definition details on --no-data dump
+#
+create database d;
+CREATE SEQUENCE d.s1 START WITH 100 INCREMENT BY 10 MINVALUE=100 MAXVALUE=1100 CYCLE;
+CREATE SEQUENCE d.s2 START WITH 200 INCREMENT BY 20 MINVALUE=200 MAXVALUE=1200 CYCLE;
+CREATE SEQUENCE d.s3 START WITH 300 INCREMENT BY 30 MINVALUE=300 MAXVALUE=1300 CYCLE;
+CREATE SEQUENCE d.s4 START WITH 400 INCREMENT BY 40 MINVALUE=400 MAXVALUE=1400 CYCLE;
+SELECT NEXTVAL(d.s1),NEXTVAL(d.s2),NEXTVAL(d.s3), NEXTVAL(d.s4);
+NEXTVAL(d.s1)	NEXTVAL(d.s2)	NEXTVAL(d.s3)	NEXTVAL(d.s4)
+100	200	300	400
+# Show create before dump
+show create sequence d.s1;
+Table	Create Table
+s1	CREATE SEQUENCE `s1` start with 100 minvalue 100 maxvalue 1100 increment by 10 cache 1000 cycle ENGINE=MyISAM
+show create sequence d.s2;
+Table	Create Table
+s2	CREATE SEQUENCE `s2` start with 200 minvalue 200 maxvalue 1200 increment by 20 cache 1000 cycle ENGINE=MyISAM
+show create sequence d.s3;
+Table	Create Table
+s3	CREATE SEQUENCE `s3` start with 300 minvalue 300 maxvalue 1300 increment by 30 cache 1000 cycle ENGINE=MyISAM
+show create sequence d.s4;
+Table	Create Table
+s4	CREATE SEQUENCE `s4` start with 400 minvalue 400 maxvalue 1400 increment by 40 cache 1000 cycle ENGINE=MyISAM
+# Dump sequence without `--no-data`
+# Restore from mysqldump
+SETVAL(`s1`, 1101, 0)
+1101
+SETVAL(`s2`, 1201, 0)
+1201
+SETVAL(`s3`, 1301, 0)
+1301
+SETVAL(`s4`, 1401, 0)
+1401
+# Show create after restore
+show create sequence d.s1;
+Table	Create Table
+s1	CREATE SEQUENCE `s1` start with 100 minvalue 100 maxvalue 1100 increment by 10 cache 1000 cycle ENGINE=MyISAM
+show create sequence d.s2;
+Table	Create Table
+s2	CREATE SEQUENCE `s2` start with 200 minvalue 200 maxvalue 1200 increment by 20 cache 1000 cycle ENGINE=MyISAM
+show create sequence d.s3;
+Table	Create Table
+s3	CREATE SEQUENCE `s3` start with 300 minvalue 300 maxvalue 1300 increment by 30 cache 1000 cycle ENGINE=MyISAM
+show create sequence d.s4;
+Table	Create Table
+s4	CREATE SEQUENCE `s4` start with 400 minvalue 400 maxvalue 1400 increment by 40 cache 1000 cycle ENGINE=MyISAM
+SELECT NEXTVAL(d.s1),NEXTVAL(d.s2),NEXTVAL(d.s3), NEXTVAL(d.s4);
+NEXTVAL(d.s1)	NEXTVAL(d.s2)	NEXTVAL(d.s3)	NEXTVAL(d.s4)
+100	200	300	400
+# Dump sequence with `--no-data`
+# Restore from mysqldump
+SETVAL(`s1`, 1101, 0)
+1101
+SETVAL(`s2`, 1201, 0)
+1201
+SETVAL(`s3`, 1301, 0)
+1301
+SETVAL(`s4`, 1401, 0)
+1401
+# Show create after restore `--no-data`
+show create sequence d.s1;
+Table	Create Table
+s1	CREATE SEQUENCE `s1` start with 100 minvalue 100 maxvalue 1100 increment by 10 cache 1000 cycle ENGINE=MyISAM
+show create sequence d.s2;
+Table	Create Table
+s2	CREATE SEQUENCE `s2` start with 200 minvalue 200 maxvalue 1200 increment by 20 cache 1000 cycle ENGINE=MyISAM
+show create sequence d.s3;
+Table	Create Table
+s3	CREATE SEQUENCE `s3` start with 300 minvalue 300 maxvalue 1300 increment by 30 cache 1000 cycle ENGINE=MyISAM
+show create sequence d.s4;
+Table	Create Table
+s4	CREATE SEQUENCE `s4` start with 400 minvalue 400 maxvalue 1400 increment by 40 cache 1000 cycle ENGINE=MyISAM
+SELECT NEXTVAL(d.s1),NEXTVAL(d.s2),NEXTVAL(d.s3), NEXTVAL(d.s4);
+NEXTVAL(d.s1)	NEXTVAL(d.s2)	NEXTVAL(d.s3)	NEXTVAL(d.s4)
+100	200	300	400
+# Restore to different database than original
+create database d2;
+SETVAL(`s1`, 1101, 0)
+1101
+SETVAL(`s2`, 1201, 0)
+1201
+SETVAL(`s3`, 1301, 0)
+1301
+SETVAL(`s4`, 1401, 0)
+1401
+show create sequence d2.s1;
+Table	Create Table
+s1	CREATE SEQUENCE `s1` start with 100 minvalue 100 maxvalue 1100 increment by 10 cache 1000 cycle ENGINE=MyISAM
+drop sequence d.s1, d.s2, d.s3, d.s4;
+drop database d;
+drop database d2;
+#
+# MDEV-20070
+# mysqldump won't work correct on sequences
+#
+DROP DATABASE IF EXISTS test1;
+Warnings:
+Note	1008	Can't drop database 'test1'; database doesn't exist
+DROP DATABASE IF EXISTS test2;
+Warnings:
+Note	1008	Can't drop database 'test2'; database doesn't exist
+CREATE DATABASE test1;
+CREATE DATABASE test2;
+USE test1;
+CREATE SEQUENCE seq_t_i INCREMENT 5 START WITH 1;
+CREATE TABLE t(
+i integer DEFAULT nextval(seq_t_i),
+j integer
+);
+INSERT INTO t VALUES (1,1),(2,2),(3,3),(4,4);
+# Dump database 1
+# Restore from database 1 to database 2
+SETVAL(`seq_t_i`, 1, 0)
+1
+DROP DATABASE IF EXISTS test1;
+DROP DATABASE IF EXISTS test2;
 # End of 10.3 tests