JQL Query To Show One Issue From Each User On The Board - jira

Question

I've tried looking on the JIRA website and through the JQL Documentation. We've got a Kanban board that we're using, and ideally, I'd like it to show the highest priority issue per user that has an issue in the column before sorting in any other way.
Right now, I've got it ordered by priority DESC, and it will show the following:
- UserA P1
- UserA P2
- UserB P2
- UserB P3
- UserC P3
- UserC P3
- UserA P4
- UserB P4
What I would like to see, ideally, would be this (using the same data):
- UserA P1
- UserB P2
- UserC P3
- Rest of tickets ordered by priority
Is that possible to do in JQL?

Answer 1

I don't think you have an option to do it in JQL but you can directly access the jira database.
You can get some more information about the database schema here
JIRA Database schema
For example this is the description of jiraissue table
mysql> desc jiraissue;
+----------------------+---------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------------------+---------------+------+-----+---------+-------+
| ID | decimal(18,0) | NO | PRI | NULL | |
| pkey | varchar(255) | YES | UNI | NULL | |
| PROJECT | decimal(18,0) | YES | MUL | NULL | |
| REPORTER | varchar(255) | YES | | NULL | |
| ASSIGNEE | varchar(255) | YES | MUL | NULL | |
| issuetype | varchar(255) | YES | | NULL | |
| SUMMARY | varchar(255) | YES | | NULL | |
| DESCRIPTION | longtext | YES | | NULL | |
| ENVIRONMENT | longtext | YES | | NULL | |
| PRIORITY | varchar(255) | YES | | NULL | |
| RESOLUTION | varchar(255) | YES | | NULL | |
| issuestatus | varchar(255) | YES | | NULL | |
| CREATED | datetime | YES | | NULL | |
| UPDATED | datetime | YES | | NULL | |
| DUEDATE | datetime | YES | | NULL | |
| RESOLUTIONDATE | datetime | YES | | NULL | |
| VOTES | decimal(18,0) | YES | | NULL | |
| WATCHES | decimal(18,0) | YES | | NULL | |
| TIMEORIGINALESTIMATE | decimal(18,0) | YES | | NULL | |
| TIMEESTIMATE | decimal(18,0) | YES | | NULL | |
| TIMESPENT | decimal(18,0) | YES | | NULL | |
| WORKFLOW_ID | decimal(18,0) | YES | MUL | NULL | |
| SECURITY | decimal(18,0) | YES | | NULL | |
| FIXFOR | decimal(18,0) | YES | | NULL | |
| COMPONENT | decimal(18,0) | YES | | NULL | |
+----------------------+---------------+------+-----+---------+-------+
To achieve ranking you can use the following query in MySQL
SELECT ASSIGNEE,
PRIORITY,
MAX(rank)
FROM (SELECT ASSIGNEE,
PRIORITY,
CASE
WHEN #prevRank = SUBSTR(PRIORITY, 2) THEN #curRank
WHEN #prevRank := SUBSTR(PRIORITY, 2) THEN #curRank := #curRank + 1
END AS rank
FROM jiraissue,
(SELECT #curRank :=0, #prevRank := NULL) r
ORDER BY PRIORITY) t
GROUP BY ASSIGNEE
Refer to this SQLFiddle

Answer 2

It is not good to access Jira's Database. If you are looking for a query t show task for specific user you can do this:
project = name_of_project and assignee = name_of_user