org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveLimit Maven / Gradle / Ivy
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package org.apache.hadoop.hive.ql.optimizer.calcite.reloperators;
import java.util.List;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelOptCost;
import org.apache.calcite.plan.RelOptPlanner;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.SingleRel;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.rex.RexNode;
import org.apache.hadoop.hive.ql.optimizer.calcite.TraitsUtil;
public class HiveLimit extends SingleRel implements HiveRelNode {
private final RexNode offset;
private final RexNode fetch;
HiveLimit(RelOptCluster cluster, RelTraitSet traitSet, RelNode child, RexNode offset,
RexNode fetch) {
super(cluster, TraitsUtil.getDefaultTraitSet(cluster), child);
this.offset = offset;
this.fetch = fetch;
assert getConvention() instanceof HiveRelNode;
assert getConvention() == child.getConvention();
}
@Override
public HiveLimit copy(RelTraitSet traitSet, List newInputs) {
return new HiveLimit(getCluster(), traitSet, sole(newInputs), offset, fetch);
}
public void implement(Implementor implementor) {
}
@Override
public RelOptCost computeSelfCost(RelOptPlanner planner) {
return RelMetadataQuery.getNonCumulativeCost(this);
}
}