ternalLink">Object</a>
implements org.apache.spark.api.java.function.PairFlatMapFunction&lt;scala.Tuple2&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Long.html?is-external=true" title="class or interface in java.lang" class="externalLink">Long</a>,&#8203;scala.Tuple2&lt;<a href="../../../matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>,&#8203;<a href="../../../matrix/data/MatrixBlock.html" title="class in org.apache.sys