This has been asked before here: https://answers.atlassian.com/questions/20653/jql-project-dnatest-and-rownum-10-how-to-use-rownum
Limit is not supported so far.
Also, not sure if this is helpful for you or not: https://confluence.atlassian.com/display/JIRA/Limiting+the+number+of+issues+returned+from+a+search+view+such+as+an+RSS+feed
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