Difference between JQL aliases and functions
JQL aliases added by the app are accessible from Jira advanced search. JQL functions are accessible from Extended Search screen or via Extended Search filters in Jira advanced search.
Aliases are used just like keyword. For example: linkType="blocks"
Functions need to be called with the issue in
clause. For example issue in epicsOfChildrenInQuery("'Team Name'='My great team'")
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Make sure to go through the steps in the Getting Started with JQL Search Extensions for Jira guide to better understand the aliases and functions.