https://community.appian.com/discussions/f/general/18727/strange-index-behaviour-depending-on-defaultIf you run: you&#39;d get, as expected: However, if instead you run: you&#39;d get: whereas I would have expected an empty list. Why does this happen?en-USTelligent Community 12https://community.appian.com/thread/73716?ContentTypeID=1Thu, 30 Apr 2020 15:52:14 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:b02d5ea7-4107-4d8a-9be3-17e11eebe730davel001150<p>Short answer appears to be that no one fully understands why.</p> <p>Treat it as an undocumented feature?</p><div style="clear:both;"></div>https://community.appian.com/thread/73714?ContentTypeID=1Thu, 30 Apr 2020 14:00:33 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:86b4a649-847b-4bf9-be8b-e6a1b9ae0838Mike Schmitt<p>This has been around for a while - there are probably a few different previous discussions on the topic.&nbsp; Here&#39;s the one I was able to find with just a quick search:&nbsp;<a href="/discussions/f/rules/6529/this-is-a-question-about-the-behavior-of-fn-index-function-the-syntax-is-fn-i">https://community.appian.com/discussions/f/rules/6529/this-is-a-question-about-the-behavior-of-fn-index-function-the-syntax-is-fn-i</a></p><div style="clear:both;"></div>