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

client/mysqldump.c

@@ -39,7 +39,7 @@
 ** 10 Jun 2003: SET NAMES and --no-set-names by Alexander Barkov
 */
 
-#define DUMP_VERSION "10.17"
+#define DUMP_VERSION "10.18"
 
 #include <my_global.h>
 #include <my_sys.h>
@@ -83,6 +83,7 @@
 #define IGNORE_NONE 0x00 /* no ignore */
 #define IGNORE_DATA 0x01 /* don't dump data for this table */
 #define IGNORE_INSERT_DELAYED 0x02 /* table doesn't support INSERT DELAYED */
+#define IGNORE_SEQUENCE_TABLE 0x04 /* catch the SEQUENCE*/
 
 /* Chars needed to store LONGLONG, excluding trailing '\0'. */
 #define LONGLONG_LEN 20
@@ -2738,7 +2739,68 @@ static inline my_bool general_log_or_slow_log_tables(const char *db,
            !my_strcasecmp(charset_info, table, "slow_log") ||
            !my_strcasecmp(charset_info, table, "transaction_registry"));
 }
+/*
+  get_sequence_structure-- retrievs sequence structure, prints out corresponding
+  CREATE statement
+  ARGS
+    seq         - sequence name
+    db          - db name
+*/
+
+static void get_sequence_structure(const char *seq, const char *db)
+{
+
+  char	     table_buff[NAME_LEN*2+3];
+  char       *result_seq;
+  FILE       *sql_file= md_result_file;
+  MYSQL_RES  *result;
+  MYSQL_ROW  row;
 
+  DBUG_ENTER("get_sequence_structure");
+  DBUG_PRINT("enter", ("db: %s  sequence: %s", db, seq));
+
+  verbose_msg("-- Retrieving sequence structure for  %s...\n", seq);
+
+  result_seq= quote_name(seq, table_buff, 1);
+  // Sequences as tables share same flags
+  if (!opt_no_create_info)
+  {
+    char buff[20+FN_REFLEN];
+    my_snprintf(buff, sizeof(buff), "SHOW CREATE SEQUENCE %s", result_seq);
+    if (mysql_query_with_error_report(mysql, &result, buff))
+    {
+      DBUG_VOID_RETURN;
+    }
+
+    print_comment(sql_file, 0,
+              "\n--\n-- Sequence structure for %s\n--\n\n",
+              fix_for_comment(result_seq));
+    if (opt_drop)
+    {
+      fprintf(sql_file, "DROP SEQUENCE IF EXISTS %s;\n", result_seq);
+      check_io(sql_file);
+    }
+
+    row= mysql_fetch_row(result);
+    fprintf(sql_file, "%s;\n", row[1]);
+    mysql_free_result(result);
+
+    // Restore next not cached value from sequence
+    my_snprintf(buff, sizeof(buff), "SELECT next_not_cached_value FROM %s", result_seq);
+    if (mysql_query_with_error_report(mysql, &result, buff))
+    {
+      DBUG_VOID_RETURN;
+    }
+    row= mysql_fetch_row(result);
+    if (row[0])
+    {
+      fprintf(sql_file, "SELECT SETVAL(%s, %s, 0);\n", result_seq, row[0]);
+    }
+    // Sequences will not use inserts, so no need for REPLACE and LOCKS
+    mysql_free_result(result);
+  }
+  DBUG_VOID_RETURN;
+}
 /*
   get_table_structure -- retrievs database structure, prints out corresponding
   CREATE statement and fills out insert_pat if the table is the type we will
@@ -3720,6 +3782,14 @@ static void dump_table(char *table, char *db, const uchar *hash_key, size_t len)
   MYSQL_ROW     row;
   DBUG_ENTER("dump_table");
 
+  /*
+    Check does table has a sequence structure and if has apply different sql queries
+  */
+  if (check_if_ignore_table(table, table_type) & IGNORE_SEQUENCE_TABLE)
+  {
+    get_sequence_structure(table, db);
+    DBUG_VOID_RETURN;
+  }
   /*
     Make sure you get the create table info before the following check for
     --no-data flag below. Otherwise, the create table info won't be printed.
@@ -5688,7 +5758,7 @@ char check_if_ignore_table(const char *table_name, char *table_type)
   /* Check memory for quote_for_like() */
   DBUG_ASSERT(2*sizeof(table_name) < sizeof(show_name_buff));
   my_snprintf(buff, sizeof(buff),
-              "SELECT engine FROM INFORMATION_SCHEMA.TABLES "
+              "SELECT engine, table_type FROM INFORMATION_SCHEMA.TABLES "
               "WHERE table_schema = DATABASE() AND table_name = %s",
               quote_for_equal(table_name, show_name_buff));
   if (mysql_query_with_error_report(mysql, &res, buff))
@@ -5728,7 +5798,8 @@ char check_if_ignore_table(const char *table_name, char *table_type)
           strcmp(table_type,"MEMORY"))
         result= IGNORE_INSERT_DELAYED;
     }
-
+    if (!strcmp(row[1],"SEQUENCE"))
+      result|= IGNORE_SEQUENCE_TABLE;
     /*
       If these two types, we do want to skip dumping the table
     */

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

mysql-test/main/mysqldump.test

@@ -2793,4 +2793,87 @@ select * from t3;
 desc t3;
 drop database d;
 
+--echo #
+--echo # MDEV-21786:
+--echo # mysqldump will forget sequence definition details on --no-data dump
+--echo #
+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);
+
+--echo # Show create before dump
+show create sequence d.s1;
+show create sequence d.s2;
+show create sequence d.s3;
+show create sequence d.s4;
+
+--echo # Dump sequence without `--no-data`
+--exec $MYSQL_DUMP --databases d > $MYSQLTEST_VARDIR/tmp/dump1.sql
+--echo # Restore from mysqldump
+--exec $MYSQL -Dd < $MYSQLTEST_VARDIR/tmp/dump1.sql
+--remove_file $MYSQLTEST_VARDIR/tmp/dump1.sql
+
+--echo # Show create after restore
+show create sequence d.s1;
+show create sequence d.s2;
+show create sequence d.s3;
+show create sequence d.s4;
+SELECT NEXTVAL(d.s1),NEXTVAL(d.s2),NEXTVAL(d.s3), NEXTVAL(d.s4);
+
+--echo # Dump sequence with `--no-data`
+--exec $MYSQL_DUMP --databases d --no-data > $MYSQLTEST_VARDIR/tmp/dump-no-data.sql
+--echo # Restore from mysqldump
+--exec $MYSQL -Dd < $MYSQLTEST_VARDIR/tmp/dump-no-data.sql
+--remove_file $MYSQLTEST_VARDIR/tmp/dump-no-data.sql
+
+--echo # Show create after restore `--no-data`
+show create sequence d.s1;
+show create sequence d.s2;
+show create sequence d.s3;
+show create sequence d.s4;
+SELECT NEXTVAL(d.s1),NEXTVAL(d.s2),NEXTVAL(d.s3), NEXTVAL(d.s4);
+
+--echo # Restore to different database than original
+--exec $MYSQL_DUMP d >  $MYSQLTEST_VARDIR/tmp/dumpd.sql
+create database d2;
+--exec $MYSQL d2 < $MYSQLTEST_VARDIR/tmp/dumpd.sql
+--remove_file $MYSQLTEST_VARDIR/tmp/dumpd.sql
+show create sequence d2.s1;
+
+drop sequence d.s1, d.s2, d.s3, d.s4;
+drop database d;
+drop database d2;
+
+--echo #
+--echo # MDEV-20070
+--echo # mysqldump won't work correct on sequences
+--echo #
+
+DROP DATABASE IF EXISTS test1;
+DROP DATABASE IF EXISTS test2;
+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);
+
+--echo # Dump database 1
+--exec $MYSQL_DUMP test1 > $MYSQLTEST_VARDIR/tmp/dumptest1.sql
+--echo # Restore from database 1 to database 2
+
+--error 1
+--exec $MYSQL test2 < $MYSQLTEST_VARDIR/tmp/dumptest1.sql
+
+--remove_file $MYSQLTEST_VARDIR/tmp/dumptest1.sql
+DROP DATABASE IF EXISTS test1;
+DROP DATABASE IF EXISTS test2;
+
 --echo # End of 10.3 tests

mysql-test/suite/sql_sequence/mysqldump.result

@@ -2,20 +2,8 @@ CREATE SEQUENCE a1 engine=aria;
 CREATE TABLE t1(a INT, KEY (a)) KEY_BLOCK_SIZE=1024;
 insert into t1 values (1),(2);
 CREATE SEQUENCE x1 engine=innodb;
-/*!40101 SET @saved_cs_client     = @@character_set_client */;
-/*!40101 SET character_set_client = utf8 */;
-CREATE TABLE `a1` (
-  `next_not_cached_value` bigint(21) NOT NULL,
-  `minimum_value` bigint(21) NOT NULL,
-  `maximum_value` bigint(21) NOT NULL,
-  `start_value` bigint(21) NOT NULL COMMENT 'start value when sequences is created or value if RESTART is used',
-  `increment` bigint(21) NOT NULL COMMENT 'increment value',
-  `cache_size` bigint(21) unsigned NOT NULL,
-  `cycle_option` tinyint(1) unsigned NOT NULL COMMENT '0 if no cycles are allowed, 1 if the sequence should begin a new cycle when maximum_value is passed',
-  `cycle_count` bigint(21) NOT NULL COMMENT 'How many cycles have been done'
-) ENGINE=Aria SEQUENCE=1;
-/*!40101 SET character_set_client = @saved_cs_client */;
-INSERT INTO `a1` VALUES (1,1,9223372036854775806,1,1,1000,0,0);
+CREATE SEQUENCE `a1` start with 1 minvalue 1 maxvalue 9223372036854775806 increment by 1 cache 1000 nocycle ENGINE=Aria;
+SELECT SETVAL(`a1`, 1, 0);
 /*!40101 SET @saved_cs_client     = @@character_set_client */;
 /*!40101 SET character_set_client = utf8 */;
 CREATE TABLE `t1` (
@@ -24,20 +12,8 @@ CREATE TABLE `t1` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1 KEY_BLOCK_SIZE=1024;
 /*!40101 SET character_set_client = @saved_cs_client */;
 INSERT INTO `t1` VALUES (1),(2);
-/*!40101 SET @saved_cs_client     = @@character_set_client */;
-/*!40101 SET character_set_client = utf8 */;
-CREATE TABLE `x1` (
-  `next_not_cached_value` bigint(21) NOT NULL,
-  `minimum_value` bigint(21) NOT NULL,
-  `maximum_value` bigint(21) NOT NULL,
-  `start_value` bigint(21) NOT NULL COMMENT 'start value when sequences is created or value if RESTART is used',
-  `increment` bigint(21) NOT NULL COMMENT 'increment value',
-  `cache_size` bigint(21) unsigned NOT NULL,
-  `cycle_option` tinyint(1) unsigned NOT NULL COMMENT '0 if no cycles are allowed, 1 if the sequence should begin a new cycle when maximum_value is passed',
-  `cycle_count` bigint(21) NOT NULL COMMENT 'How many cycles have been done'
-) ENGINE=InnoDB SEQUENCE=1;
-/*!40101 SET character_set_client = @saved_cs_client */;
-INSERT INTO `x1` VALUES (1,1,9223372036854775806,1,1,1000,0,0);
+CREATE SEQUENCE `x1` start with 1 minvalue 1 maxvalue 9223372036854775806 increment by 1 cache 1000 nocycle ENGINE=InnoDB;
+SELECT SETVAL(`x1`, 1, 0);
 DROP TABLE a1,t1,x1;
 set default_storage_engine=InnoDB;
 create sequence t1;