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This is in a way complementary to MDEV-26606, with some luck it has the same root cause, although I'm not sure about it
create or replace table t1 (pk int primary key, a char(3));
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insert ignore into t1 values (1,'foo'),(1,'bar'),(2,'foobar');
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--delimiter $
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begin not atomic
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declare i int default 0;
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declare rnum int default -1;
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declare msg varchar(1024) default '';
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declare err int default -1;
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while i < @@warning_count
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do
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set i = i + 1;
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get diagnostics condition i rnum = error_index, msg = message_text, err = mysql_errno;
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select i, rnum, msg, err;
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end while;
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end $
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--delimiter ;
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get diagnostics condition 1 @rnum = error_index, @msg = message_text, @err = mysql_errno;
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select @rnum, @msg, @err;
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get diagnostics condition 2 @rnum = error_index, @msg = message_text, @err = mysql_errno;
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select @rnum, @msg, @err;
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(To run via the client, remember to change --delimiter lines).
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10.7 d552e092c9 Within the compound block
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+------+------+---------------------------------------+------+
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| i | rnum | msg | err |
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+------+------+---------------------------------------+------+
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| 1 | 1 | Duplicate entry '1' for key 'PRIMARY' | 1062 |
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+------+------+---------------------------------------+------+
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1 row in set (0.001 sec)
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+------+------+----------------------------------------+------+
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| i | rnum | msg | err |
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+------+------+----------------------------------------+------+
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| 2 | 1 | Data truncated for column 'a' at row 3 | 1265 |
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+------+------+----------------------------------------+------+
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1 row in set (0.001 sec)
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Outside the compound block
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MariaDB [test]> get diagnostics condition 1 @rnum = error_index, @msg = message_text, @err = mysql_errno;
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Query OK, 0 rows affected (0.000 sec)
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MariaDB [test]> select @rnum, @msg, @err;
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+-------+---------------------------------------+------+
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| @rnum | @msg | @err |
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+-------+---------------------------------------+------+
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| 2 | Duplicate entry '1' for key 'PRIMARY' | 1062 |
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+-------+---------------------------------------+------+
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1 row in set (0.000 sec)
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MariaDB [test]> get diagnostics condition 2 @rnum = error_index, @msg = message_text, @err = mysql_errno;
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Query OK, 0 rows affected (0.000 sec)
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MariaDB [test]> select @rnum, @msg, @err;
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+-------+----------------------------------------+------+
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| @rnum | @msg | @err |
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+-------+----------------------------------------+------+
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| 3 | Data truncated for column 'a' at row 3 | 1265 |
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+-------+----------------------------------------+------+
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1 row in set (0.000 sec)
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So, other diagnostics are equally available within the block and outside, but ERROR_INDEX is not.
Same applies to traditional stored procedures, naturally.
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