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In this example, the user function is given a name ("square") and then used to perform the same calculation on multiple fields. To learn more, see the language reference.
Embeded JQL Queries
Variables are user-defined names, which represent Jira issue fields., using a construct similar to Aggregate Functions. The result will be a boolean value:

• 1 (true) if the current row matches the query

• 0 (false) otherwise

For example:

// Collect total story points from all sub-issues assigned to members of Team2 group

...

SUM { 
    IF JQL { assignee in membersOf("Team2") } : 
      storyPoints
}