DDL: crash after uninitialized read in row_merge_buf_add

Version: '10.0.1-MariaDB' Source distribution

Conditional jump or move depends on uninitialised value(s)

at: row_merge_buf_add (row0merge.cc:398)

by: row_merge_read_clustered_index (row0merge.cc:269)

by: row_merge_build_indexes (row0merge.cc:2994)

by: ha_innobase::add_index (handler0alter.cc:1303)

by: mysql_alter_table (sql_table.cc:6958)

by: Alter_table_statement::execute (sql_alter.cc:106)

by: mysql_execute_command (sql_parse.cc:4834)

by: mysql_parse (sql_parse.cc:6124)

by: dispatch_command (sql_parse.cc:1266)

by: do_handle_one_connection (sql_connect.cc:1267)

by: handle_one_connection (sql_connect.cc:1181)

by: start_thread (pthread_create.c:309)

--source include/have_innodb.inc

--disable_abort_on_error

drop table if exists `i` ;

create table `i`(`t` char (3))engine=innodb row_format=compact default charset=latin1;

insert `i` values ('a') ;

alter table `i` add column `l` int,add column `j` int not null  ;

alter table `i` add fulltext index (`t`) ,add fulltext index (`t`) ;

alter table `i` add unique (`j`);