| /* |
| * 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.beam.sdk.extensions.sql.impl; |
| |
| import java.io.Serializable; |
| import java.util.List; |
| import org.apache.beam.sdk.annotations.Experimental; |
| import org.apache.beam.sdk.annotations.Internal; |
| import org.apache.beam.vendor.calcite.v1_20_0.com.google.common.collect.ImmutableList; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelCollation; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelDistribution; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelDistributionTraitDef; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelReferentialConstraint; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.schema.Statistic; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.util.ImmutableBitSet; |
| |
| /** This class stores row count statistics. */ |
| @Experimental |
| @Internal |
| public class BeamTableStatistics implements Serializable, Statistic { |
| public static final BeamTableStatistics BOUNDED_UNKNOWN = new BeamTableStatistics(100d, 0d, true); |
| public static final BeamTableStatistics UNBOUNDED_UNKNOWN = |
| new BeamTableStatistics(0d, 0.1, true); |
| private final boolean unknown; |
| private final Double rowCount; |
| private final Double rate; |
| |
| private BeamTableStatistics(Double rowCount, Double rate, boolean isUnknown) { |
| this.rowCount = rowCount; |
| this.rate = rate; |
| this.unknown = isUnknown; |
| } |
| |
| private BeamTableStatistics(Double rowCount, Double rate) { |
| this(rowCount, rate, false); |
| } |
| |
| public static BeamTableStatistics createBoundedTableStatistics(Double rowCount) { |
| return new BeamTableStatistics(rowCount, 0d); |
| } |
| |
| public static BeamTableStatistics createUnboundedTableStatistics(Double rate) { |
| return new BeamTableStatistics(0d, rate); |
| } |
| |
| public Double getRate() { |
| return rate; |
| } |
| |
| public boolean isUnknown() { |
| return unknown; |
| } |
| |
| @Override |
| public Double getRowCount() { |
| return rowCount; |
| } |
| |
| @Override |
| public boolean isKey(ImmutableBitSet columns) { |
| return false; |
| } |
| |
| @Override |
| public List<RelReferentialConstraint> getReferentialConstraints() { |
| return ImmutableList.of(); |
| } |
| |
| @Override |
| public List<RelCollation> getCollations() { |
| return ImmutableList.of(); |
| } |
| |
| @Override |
| public RelDistribution getDistribution() { |
| return RelDistributionTraitDef.INSTANCE.getDefault(); |
| } |
| } |