Issue Summary

Assignee can be described as a number for example 999998 or as a string for example aabbb1111118888:1

Searching for an assignee doesn't work when the assignee's number is outside of the Long value range.

This search works: 

assignee = 123456 -> It's treated as a number probably

This search works:

assignee = 123456:a -> It's treated as a string

This search doesn't work:

assignee = 123456789123456789123456789 -> it's treated as a number

This search works:

assignee = "123456789123456789123456789" -> It's treated as a string

Steps to Reproduce

1. Go to search
2. Type JQL with assignee which is a big number for example : "assignee = 9999999999999999999999"

Expected Results

The query should be parsable.

Actual Results

The below exception is thrown while parsing:

Error in the JQL Query: '9999999999999999999999' is not a valid number. Numbers must be between -9,223,372,036,854,775,808 and 9,223,372,036,854,775,807. 

Workaround

Use "" when searching for assignee which is defined as a big number:

assignee = "9999999999999999999999"