Type: Function
Function: IS_NULL
Syntax: IS_NULL(value)
Description: Return true if the provided argument is null.
Sample usage:
IS_NULL(assigned_at)returnstrueif theassigned_atfield value isnull(the issue or pull request has never been assigned to anyone or the historical value could not be determined).IS_NULL(merged_at)returnstrueif themerged_atfield value isnull(the record is an issue or the pull request has not been merged).
