Vicențiu Ciorbaru added a comment - 2017-07-10 13:30 The current test case seems to corrupt the procs table: delimiter |;   create aggregate function agg_sum(x INT ) returns double begin declare z double default 0; declare continue handler for not found return z;   loop fetch group next row; set z = z + x; end loop; end |   delimiter ;|   create table t1 (id int , salary int );   INSERT INTO t1 VALUES (1, 100), (2, 40), (3, 6);   show create function agg_sum; alter function agg_sum aggregate none; show create function agg_sum; Final query fails with: # This fails with 'show create function agg_sum' failed: 1457: Failed to load routine test.agg_sum. The table mysql.proc is missing, corrupt, or contains bad data (internal code -6)

Vicențiu Ciorbaru added a comment - 2017-10-28 14:41 Just a few minor dead-code removal and history cleanup, then we can push.

Varun Gupta (Inactive) added a comment - 2017-11-26 18:29 A final rebase was required, resolved the conflicts and have sent it to cvicentiu for review. Have pushed it to bb-10.3-varun for final testing

Elena Stepanova added a comment - 2017-11-29 13:16 I haven't got anything of significance in a round of tests on bb-10.3-varun 7d8c5ee4039. Testing of correctness of results is limited due to numerous existing problems in this area, unrelated to the new functionality. I haven't got any functionality-specific crashes. After fixing MDEV-14520 and addressing all reviews, please go ahead and push to 10.3. If reviews require significant changes in the code, please notify so that I re-run the tests. Please make sure the functionality is documented in the KB, if not done yet. Among other things, I think it should be specifically mentioned in the documentation that unlike built-in functions, the custom ones don't provide automatic type recognition and act according to the types specified in the function itself. For a simple example, consider the following create or replace table t1 (i int , c char (8), ci char (8)); insert into t1 values (10, 'foo' , '10' ),(2, 'bar' , '2' );   delimiter $ create or replace aggregate function agg_max1(x INT ) returns INT begin declare m INT default NULL ; declare continue handler for not found return m; loop fetch group next row; if (x is not null ) and (m is null or m < x) then set m= x; end if ; end loop; end $   create or replace aggregate function agg_max2(x BLOB) returns BLOB begin declare m BLOB default NULL ; declare continue handler for not found return m; loop fetch group next row; if (x is not null ) and (m is null or m < x) then set m= x; end if ; end loop; end $ delimiter ; Here, column `i` is integer, column `ci` is text which contains integer values, and column `c` is text. The in-built function MAX will treat each of them accordingly – the result will be based on integer comparison for `i` , on text comparison for `ci` and `c` . MariaDB [test]> select max (i), max (ci), max (c) from t1; + --------+---------+--------+ | max (i) | max (ci) | max (c) | + --------+---------+--------+ | 10 | 2 | foo | + --------+---------+--------+ 1 row in set (0.00 sec) Definitions of functions agg_max1 and agg_max2 are identical, except that agg_max1 works with integers and agg_max2 with blobs. On the same data, agg_max2 will do text comparison for all columns, regardless their initial type MariaDB [test]> select agg_max2(i), agg_max2(ci), agg_max2(c) from t1; + -------------+--------------+-------------+ | agg_max2(i) | agg_max2(ci) | agg_max2(c) | + -------------+--------------+-------------+ | 2 | 2 | foo | + -------------+--------------+-------------+ 1 row in set (0.00 sec) Function agg_max1 will do integer comparison for anything that looks like integer – in this case, for `i` and for `ci` : MariaDB [test]> select agg_max1(i), agg_max1(ci) from t1; + -------------+--------------+ | agg_max1(i) | agg_max1(ci) | + -------------+--------------+ | 10 | 10 | + -------------+--------------+ 1 row in set (0.00 sec) And for something that doesn't look like integer, it doesn't work at all: MariaDB [test]> set sql_mode= 'STRICT_ALL_TABLES' ; Query OK, 0 rows affected (0.02 sec)   MariaDB [test]> select agg_max1(c) from t1; ERROR 1366 (22007): Incorrect integer value: 'foo' for column 'x' at row 1 MariaDB [test]> set sql_mode= '' ; Query OK, 0 rows affected (0.00 sec)   MariaDB [test]> select agg_max1(c) from t1; + -------------+ | agg_max1(c) | + -------------+ | 0 | + -------------+ 1 row in set , 3 warnings (0.00 sec) Given that functions must define explicit types, I don't see a bug here, but it might be something users don't expect, so better to document it.