Bug#28573894 ALTER PARTITIONED TABLE ADD AUTO_INCREMENT DIFF RESULT DEPENDING ON ALGORITHM

For partitioned table, ensure that the AUTO_INCREMENT values will
be assigned from the same sequence. This is based on the following
change in MySQL 5.6.44:

commit aaba359c13d9200747a609730dafafc3b63cd4d6
Author: Rahul Malik <rahul.m.malik@oracle.com>
Date:   Mon Feb 4 13:31:41 2019 +0530

    Bug#28573894 ALTER PARTITIONED TABLE ADD AUTO_INCREMENT DIFF RESULT DEPENDING ON ALGORITHM

    Problem:
    When a partition table is in-place altered to add an auto-increment column,
    then its values are starting over for each partition.

    Analysis:
    In the case of in-place alter, InnoDB is creating a new sequence object
    for each partition. It is default initialized. So auto-increment columns
    start over for each partition.

    Fix:
    Assign old sequence of the partition to the sequence of next partition
    so it won't start over.

    RB#21148
    Reviewed by Bin Su <bin.x.su@oracle.com>

mysql-test/r/partition_innodb.result

@@ -918,3 +918,45 @@ ERROR HY000: CHECK OPTION failed 'test.v'
 SET GLOBAL innodb_stats_persistent= @save_isp;
 DROP view v;
 DROP TABLE t;
+#
+# Bug#28573894 ALTER PARTITIONED TABLE ADD AUTO_INCREMENT DIFF RESULT
+#
+CREATE TABLE t (a VARCHAR(10) NOT NULL,b INT,PRIMARY KEY (b)) ENGINE=INNODB
+PARTITION BY RANGE (b)
+(PARTITION pa VALUES LESS THAN (2),
+PARTITION pb VALUES LESS THAN (20),
+PARTITION pc VALUES LESS THAN (30),
+PARTITION pd VALUES LESS THAN (40));
+INSERT INTO t
+VALUES('A',0),('B',1),('C',2),('D',3),('E',4),('F',5),('G',25),('H',35);
+CREATE TABLE t_copy LIKE t;
+INSERT INTO t_copy SELECT * FROM t;
+ALTER TABLE t ADD COLUMN r INT UNSIGNED NOT NULL AUTO_INCREMENT,
+ADD UNIQUE KEY (r,b);
+affected rows: 0
+info: Records: 0  Duplicates: 0  Warnings: 0
+ALTER TABLE t_copy ADD COLUMN r INT UNSIGNED NOT NULL AUTO_INCREMENT,
+ADD UNIQUE KEY (r,b), ALGORITHM=COPY;
+affected rows: 8
+info: Records: 8  Duplicates: 0  Warnings: 0
+SELECT * FROM t;
+a	b	r
+A	0	1
+B	1	2
+C	2	3
+D	3	4
+E	4	5
+F	5	6
+G	25	7
+H	35	8
+SELECT * FROM t_copy;
+a	b	r
+A	0	1
+B	1	2
+C	2	3
+D	3	4
+E	4	5
+F	5	6
+G	25	7
+H	35	8
+DROP TABLE t,t_copy;

mysql-test/t/partition_innodb.test

@@ -1028,3 +1028,27 @@ SET GLOBAL innodb_stats_persistent= @save_isp;
 DROP view v;
 DROP TABLE t;
 
+--echo #
+--echo # Bug#28573894 ALTER PARTITIONED TABLE ADD AUTO_INCREMENT DIFF RESULT
+--echo #
+CREATE TABLE t (a VARCHAR(10) NOT NULL,b INT,PRIMARY KEY (b)) ENGINE=INNODB
+PARTITION BY RANGE (b)
+(PARTITION pa VALUES LESS THAN (2),
+ PARTITION pb VALUES LESS THAN (20),
+ PARTITION pc VALUES LESS THAN (30),
+ PARTITION pd VALUES LESS THAN (40));
+
+INSERT INTO t
+VALUES('A',0),('B',1),('C',2),('D',3),('E',4),('F',5),('G',25),('H',35);
+CREATE TABLE t_copy LIKE t;
+INSERT INTO t_copy SELECT * FROM t;
+
+--enable_info
+ALTER TABLE t ADD COLUMN r INT UNSIGNED NOT NULL AUTO_INCREMENT,
+ADD UNIQUE KEY (r,b);
+ALTER TABLE t_copy ADD COLUMN r INT UNSIGNED NOT NULL AUTO_INCREMENT,
+ADD UNIQUE KEY (r,b), ALGORITHM=COPY;
+--disable_info
+SELECT * FROM t;
+SELECT * FROM t_copy;
+DROP TABLE t,t_copy;

sql/ha_partition.cc

@@ -1,6 +1,6 @@
 /*
-  Copyright (c) 2005, 2017, Oracle and/or its affiliates.
-  Copyright (c) 2009, 2017, MariaDB
+  Copyright (c) 2005, 2019, Oracle and/or its affiliates.
+  Copyright (c) 2009, 2019, MariaDB
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -8329,7 +8329,12 @@ bool ha_partition::inplace_alter_table(TABLE *altered_table,
 
   for (index= 0; index < m_tot_parts && !error; index++)
   {
-    ha_alter_info->handler_ctx= part_inplace_ctx->handler_ctx_array[index];
+    if ((ha_alter_info->handler_ctx=
+	 part_inplace_ctx->handler_ctx_array[index]) != NULL
+	&& index != 0)
+      ha_alter_info->handler_ctx->set_shared_data
+	(*part_inplace_ctx->handler_ctx_array[index - 1]);
+
     if (m_file[index]->ha_inplace_alter_table(altered_table,
                                               ha_alter_info))
       error= true;

sql/handler.h

@@ -1,8 +1,8 @@
 #ifndef HANDLER_INCLUDED
 #define HANDLER_INCLUDED
 /*
-   Copyright (c) 2000, 2016, Oracle and/or its affiliates.
-   Copyright (c) 2009, 2018, MariaDB
+   Copyright (c) 2000, 2019, Oracle and/or its affiliates.
+   Copyright (c) 2009, 2019, MariaDB
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
@@ -1833,6 +1833,7 @@ public:
   inplace_alter_handler_ctx() {}
 
   virtual ~inplace_alter_handler_ctx() {}
+  virtual void set_shared_data(const inplace_alter_handler_ctx& ctx) {}
 };
 
 

storage/innobase/handler/handler0alter.cc

@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 2005, 2018, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2005, 2019, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2013, 2019, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
@@ -2178,6 +2178,23 @@ struct ha_innobase_inplace_ctx : public inplace_alter_handler_ctx
 	@return whether the table will be rebuilt */
 	bool need_rebuild () const { return(old_table != new_table); }
 
+	/** Share context between partitions.
+	@param[in] ctx	context from another partition of the table */
+	void set_shared_data(const inplace_alter_handler_ctx& ctx)
+	{
+		if (add_autoinc != ULINT_UNDEFINED) {
+			const ha_innobase_inplace_ctx& ha_ctx =
+				static_cast<const ha_innobase_inplace_ctx&>
+				(ctx);
+			/* When adding an AUTO_INCREMENT column to a
+			partitioned InnoDB table, we must share the
+			sequence for all partitions. */
+			ut_ad(ha_ctx.add_autoinc == add_autoinc);
+			ut_ad(ha_ctx.sequence.last());
+			sequence = ha_ctx.sequence;
+		}
+	}
+
 private:
 	// Disable copying
 	ha_innobase_inplace_ctx(const ha_innobase_inplace_ctx&);

storage/xtradb/handler/handler0alter.cc

@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 2005, 2018, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2005, 2019, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2017, 2019, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
@@ -2181,6 +2181,23 @@ struct ha_innobase_inplace_ctx : public inplace_alter_handler_ctx
 	@return whether the table will be rebuilt */
 	bool need_rebuild () const { return(old_table != new_table); }
 
+	/** Share context between partitions.
+	@param[in] ctx	context from another partition of the table */
+	void set_shared_data(const inplace_alter_handler_ctx& ctx)
+	{
+		if (add_autoinc != ULINT_UNDEFINED) {
+			const ha_innobase_inplace_ctx& ha_ctx =
+				static_cast<const ha_innobase_inplace_ctx&>
+				(ctx);
+			/* When adding an AUTO_INCREMENT column to a
+			partitioned InnoDB table, we must share the
+			sequence for all partitions. */
+			ut_ad(ha_ctx.add_autoinc == add_autoinc);
+			ut_ad(ha_ctx.sequence.last());
+			sequence = ha_ctx.sequence;
+		}
+	}
+
 private:
 	// Disable copying
 	ha_innobase_inplace_ctx(const ha_innobase_inplace_ctx&);