content: /*
   * 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.Collections;
  import java.util.List;
  import org.apache.beam.sdk.annotations.Internal;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.RelCollation;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.RelDistribution;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.RelDistributionTraitDef;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.RelReferentialConstraint;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.schema.Statistic;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.util.ImmutableBitSet;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  
  /** This class stores row count statistics. */
  @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<ImmutableBitSet> getKeys() {
      return Collections.emptyList();
    }
  
    @Override
    public List<RelReferentialConstraint> getReferentialConstraints() {
      return ImmutableList.of();
    }
  
    @Override
    public List<RelCollation> getCollations() {
      return ImmutableList.of();
    }
  
    @Override
    public RelDistribution getDistribution() {
      return RelDistributionTraitDef.INSTANCE.getDefault();
    }
  }
  