MDEV-11995 ALTER TABLE proceeds despite reporting ER_TOO_LONG_KEY error

automatic shortening of a too-long non-unique key should
be not a warning, but a note. It's a normal optimization,
doesn't affect correctness, and should never be converted to
an error, no matter how strict sql_mode is.

mysql-test/r/ctype_utf8mb4.result

@@ -2387,7 +2387,7 @@ PRIMARY KEY (clipid),
 KEY tape(Tape(255))
 ) CHARACTER SET=utf8mb4;
 Warnings:
-Warning	1071	Specified key was too long; max key length is 1000 bytes
+Note	1071	Specified key was too long; max key length is 1000 bytes
 ALTER TABLE t1 ADD mos TINYINT DEFAULT 0 AFTER clipid;
 SHOW CREATE TABLE t1;
 Table	Create Table

mysql-test/r/ctype_utf8mb4_innodb.result

@@ -2347,7 +2347,7 @@ PRIMARY KEY (clipid),
 KEY tape(Tape(255))
 ) CHARACTER SET=utf8mb4 ENGINE InnoDB;
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 ALTER TABLE t1 ADD mos TINYINT DEFAULT 0 AFTER clipid;
 SHOW CREATE TABLE t1;
 Table	Create Table

mysql-test/r/ctype_utf8mb4_myisam.result

@@ -2347,7 +2347,7 @@ PRIMARY KEY (clipid),
 KEY tape(Tape(255))
 ) CHARACTER SET=utf8mb4 ENGINE MyISAM;
 Warnings:
-Warning	1071	Specified key was too long; max key length is 1000 bytes
+Note	1071	Specified key was too long; max key length is 1000 bytes
 ALTER TABLE t1 ADD mos TINYINT DEFAULT 0 AFTER clipid;
 SHOW CREATE TABLE t1;
 Table	Create Table

mysql-test/r/type_blob.result

@@ -373,7 +373,7 @@ create table t1 (a text, unique (a(2100)));
 ERROR 42000: Specified key was too long; max key length is 1000 bytes
 create table t1 (a text, key (a(2100)));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 1000 bytes
+Note	1071	Specified key was too long; max key length is 1000 bytes
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (

mysql-test/suite/innodb/r/alter_table.result

@@ -0,0 +1,13 @@
+set @@sql_mode=strict_trans_tables;
+create table t1(a text not null) row_format=dynamic engine=innodb;
+create index idx1 on t1(a(3073));
+Warnings:
+Note	1071	Specified key was too long; max key length is 3072 bytes
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` text NOT NULL,
+  KEY `idx1` (`a`(3072))
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=DYNAMIC
+drop table t1;
+set @@sql_mode=default;

mysql-test/suite/innodb/r/innodb.result

@@ -2543,11 +2543,11 @@ Warning	1071	Specified key was too long; max key length is 767 bytes
 create table t3 (col1 text, index(col1(768)))
 character set = latin1 engine = innodb;
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 create table t4 (col1 blob, index(col1(768)))
 character set = latin1 engine = innodb;
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 SET GLOBAL innodb_large_prefix=default;
 Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html

mysql-test/suite/innodb/t/alter_table.test

@@ -0,0 +1,10 @@
+--source include/have_innodb.inc
+#
+# MDEV-11995 ALTER TABLE proceeds despite reporting ER_TOO_LONG_KEY error
+#
+set @@sql_mode=strict_trans_tables;
+create table t1(a text not null) row_format=dynamic engine=innodb;
+create index idx1 on t1(a(3073));
+show create table t1;
+drop table t1;
+set @@sql_mode=default;

mysql-test/suite/innodb_zip/r/index_large_prefix.result

@@ -101,7 +101,7 @@ create index idx1 on worklog5743_1(a2(4000));
 Got one of the listed errors
 show warnings;
 Level	Code	Message
-Error	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 set global innodb_large_prefix=1;
 Warnings:
@@ -110,7 +110,7 @@ create index idx2 on worklog5743_1(a2(4000));
 Got one of the listed errors
 show warnings;
 Level	Code	Message
-Error	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 create index idx3 on worklog5743_1(a2(436));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
@@ -134,10 +134,10 @@ Warning	131	Using innodb_large_prefix is deprecated and the parameter may be rem
 SET sql_mode= '';
 create index idx1 on worklog5743_2(a2(4000));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 set global innodb_large_prefix=1;
 Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
@@ -145,7 +145,7 @@ create index idx2 on worklog5743_2(a2(4000));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 create index idx3 on worklog5743_2(a2(948));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
@@ -168,10 +168,10 @@ Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx1 on worklog5743_4(a2(4000));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 set global innodb_large_prefix=1;
 Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
@@ -179,7 +179,7 @@ create index idx2 on worklog5743_4(a2(4000));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 create index idx3 on worklog5743_4(a2(1972));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
@@ -202,19 +202,19 @@ Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx1 on worklog5743_8(a2(1000));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 set global innodb_large_prefix=1;
 Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx2 on worklog5743_8(a2(3073));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 create index idx3 on worklog5743_8(a2(3072));
 Warnings:
 Note	1831	Duplicate index `idx3`. This is deprecated and will be disallowed in a future release
@@ -242,19 +242,19 @@ Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx1 on worklog5743_16(a2(1000));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 set global innodb_large_prefix=1;
 Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx2 on worklog5743_16(a2(3073));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 create index idx3 on worklog5743_16(a2(3072));
 Warnings:
 Note	1831	Duplicate index `idx3`. This is deprecated and will be disallowed in a future release
@@ -508,7 +508,7 @@ create table worklog5743(a TEXT not null) ROW_FORMAT=DYNAMIC;
 SET sql_mode='';
 create index idx1 on worklog5743(a(3073));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 create index idx2 on worklog5743(a(3072));
 Warnings:
 Note	1831	Duplicate index `idx2`. This is deprecated and will be disallowed in a future release

mysql-test/suite/innodb_zip/r/innodb_index_large_prefix.result

@@ -106,7 +106,7 @@ create index idx1 on worklog5743_1(a2(4000));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 set global innodb_large_prefix=1;
 Warnings:
@@ -115,7 +115,7 @@ create index idx2 on worklog5743_1(a2(4000));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 create index idx3 on worklog5743_1(a2(436));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
@@ -138,10 +138,10 @@ Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx1 on worklog5743_2(a2(4000));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 set global innodb_large_prefix=1;
 Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
@@ -149,7 +149,7 @@ create index idx2 on worklog5743_2(a2(4000));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 create index idx3 on worklog5743_2(a2(948));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
@@ -172,10 +172,10 @@ Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx1 on worklog5743_4(a2(4000));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 set global innodb_large_prefix=1;
 Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
@@ -183,7 +183,7 @@ create index idx2 on worklog5743_4(a2(4000));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
 create index idx3 on worklog5743_4(a2(1972));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
@@ -206,19 +206,19 @@ Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx1 on worklog5743_8(a2(1000));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 set global innodb_large_prefix=1;
 Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx2 on worklog5743_8(a2(3073));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 create index idx3 on worklog5743_8(a2(3072));
 Warnings:
 Note	1831	Duplicate index `idx3`. This is deprecated and will be disallowed in a future release
@@ -246,19 +246,19 @@ Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx1 on worklog5743_16(a2(1000));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 767 bytes
+Note	1071	Specified key was too long; max key length is 767 bytes
 set global innodb_large_prefix=1;
 Warnings:
 Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html
 create index idx2 on worklog5743_16(a2(3073));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 show warnings;
 Level	Code	Message
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 create index idx3 on worklog5743_16(a2(3072));
 Warnings:
 Note	1831	Duplicate index `idx3`. This is deprecated and will be disallowed in a future release
@@ -510,7 +510,7 @@ create table worklog5743(a TEXT not null) ROW_FORMAT=DYNAMIC;
 set statement sql_mode = '' for
 create index idx1 on worklog5743(a(3073));
 Warnings:
-Warning	1071	Specified key was too long; max key length is 3072 bytes
+Note	1071	Specified key was too long; max key length is 3072 bytes
 create index idx2 on worklog5743(a(3072));
 Warnings:
 Note	1831	Duplicate index `idx2`. This is deprecated and will be disallowed in a future release

sql/sql_table.cc

@@ -3949,7 +3949,7 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
 	    if (key->type == Key::MULTIPLE)
 	    {
 	      /* not a critical problem */
-	      push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
+	      push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
                                   ER_TOO_LONG_KEY,
                                   ER_THD(thd, ER_TOO_LONG_KEY),
                                   key_part_length);