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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.drill.exec.planner.cost;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.SingleRel;
import org.apache.calcite.rel.core.Aggregate;
import org.apache.calcite.rel.core.Filter;
import org.apache.calcite.rel.core.Join;
import org.apache.calcite.rel.core.Project;
import org.apache.calcite.rel.core.Sort;
import org.apache.calcite.rel.core.Union;
import org.apache.calcite.rel.metadata.ReflectiveRelMetadataProvider;
import org.apache.calcite.rel.metadata.RelMdRowCount;
import org.apache.calcite.rel.metadata.RelMetadataProvider;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.util.BuiltInMethod;
import org.apache.calcite.util.ImmutableBitSet;
import org.apache.drill.exec.planner.common.DrillLimitRelBase;
import org.apache.drill.exec.planner.common.DrillStatsTable;
import org.apache.drill.exec.planner.logical.DrillScanRel;
public class DrillRelMdRowCount extends RelMdRowCount {
private static final DrillRelMdRowCount INSTANCE = new DrillRelMdRowCount();
public static final RelMetadataProvider SOURCE = ReflectiveRelMetadataProvider.reflectiveSource(BuiltInMethod.ROW_COUNT.method, INSTANCE);
@Override
public Double getRowCount(Aggregate rel, RelMetadataQuery mq) {
ImmutableBitSet groupKey = ImmutableBitSet.range(rel.getGroupCount());
if (groupKey.isEmpty()) {
return 1.0;
} else {
return super.getRowCount(rel, mq);
}
}
@Override
public Double getRowCount(Filter rel, RelMetadataQuery mq) {
return rel.estimateRowCount(mq);
}
public double getRowCount(DrillLimitRelBase rel, RelMetadataQuery mq) {
return rel.estimateRowCount(mq);
}
@Override
public Double getRowCount(Union rel, RelMetadataQuery mq) {
return rel.estimateRowCount(mq);
}
@Override
public Double getRowCount(Project rel, RelMetadataQuery mq) {
return rel.estimateRowCount(mq);
}
@Override
public Double getRowCount(Sort rel, RelMetadataQuery mq) {
return rel.estimateRowCount(mq);
}
@Override
public Double getRowCount(SingleRel rel, RelMetadataQuery mq) {
return rel.estimateRowCount(mq);
}
@Override
public Double getRowCount(Join rel, RelMetadataQuery mq) {
return rel.estimateRowCount(mq);
}
public Double getRowCount(RelNode rel, RelMetadataQuery mq) {
if (rel instanceof DrillScanRel) {
return getRowCount((DrillScanRel)rel, mq);
}
return super.getRowCount(rel, mq);
}
private Double getRowCount(DrillScanRel scanRel, RelMetadataQuery mq) {
final DrillStatsTable md = scanRel.getDrillTable().getStatsTable();
if (md != null) {
return md.getRowCount();
}
return super.getRowCount(scanRel, mq);
}
}
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