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Hi ,I am a GSoC aspirant . I am trying to solve
https://jira.mariadb.org/browse/MDEV-13648 .

Firstly , I discussed a  new algorithm with Igor Babev sir , but it was
wrong as it will create space problem.

Now , I am planning to add some code in Sql_yacc.yy :

 /*full join*/ after the right join where  /*full join */ will contain :

1.left join implementation (similar to the implementation of left join in
sql_yacc.yy (line no. 11956-11950))
      The result table will be in a temporary table ->tab1.

2.Use of right join doing the swapping of table (similar to right join in
this part  ;(line no. 11992-12030))
    the result of this will be stored in another temporary table ->tab2

3.Union all clause:
    implementation of union all clause to combine tab1 and tab2.

So , Oleksandr Byelkin sir replied to me that , addition of UNION will make
it more complicated.it could be done with less effort than adding full

But at present I am not able to get any idea how to reduce the complexity
or any kind of new idea to implement it . Please guide me in  the right
direction and help me to solve this issue.

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