<BUG>import org.qcri.rheem.core.optimizer.costs.LoadEstimator;</BUG><CONTEXT>package org.qcri.rheem.core.function;import org.qcri.rheem.core.optimizer.ProbabilisticDoubleInterval;<extra_id_0>import org.qcri.rheem.core.types.BasicDataUnitType;import org.qcri.rheem.core.types.DataUnitType;import java.util.Optional;</CONTEXT>
import org.qcri.rheem.core.optimizer.costs.LoadProfileEstimator;