class="symbol">
        <a title="" href="SparkNullIgnoringDBGroupConcatFunctionSymbol.html"><span class="name">SparkNullIgnoringDBGroupConcatFunctionSymbol</span></a><span class="result"> extends <span class="extype" name="it.unibz.inf.ontop.model.term.functionsymbol.db.impl.NullIgnoringDBGroupConcatFunctionSymbol">NullIgnoringDBGroupConcatFunctionSymbol</span></span>
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    </li><li name="net.sansa_stack.query.spark.ontop.SparkQueryUnfolder" visbl="pub" class="indented0 " data-isa