>Return</h4><p class="paragraph">The On object used for specifying join conditions.</p></span><h4 class="">Parameters</h4><div class="table"><div class="table-row" data-filterable-current=":couchbase-lite-ee/commonMain" data-filterable-set=":couchbase-lite-ee/commonMain"><div class="main-subrow keyValue "><div class=""><span class="inline-flex"><div><u><span><span>datasource</span></span></u></div></span></div><div><div class="title"><p class="paragraph">The DataSource object of the JOIN clause.</p></div></