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Merge pull request apache#9104 from riazela/BeamTableStatistics
[BEAM-7783] Adding BeamTableStatistics.
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44 changes: 0 additions & 44 deletions
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...ons/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/BeamRowCountStatistics.java
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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.beam.sdk.extensions.sql.impl; | ||
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| 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.guava.v26_0_jre.com.google.common.collect.ImmutableList; | ||
| import org.apache.calcite.rel.RelCollation; | ||
| import org.apache.calcite.rel.RelDistribution; | ||
| import org.apache.calcite.rel.RelDistributionTraitDef; | ||
| import org.apache.calcite.rel.RelReferentialConstraint; | ||
| import org.apache.calcite.schema.Statistic; | ||
| import org.apache.calcite.util.ImmutableBitSet; | ||
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| /** This class stores row count statistics. */ | ||
| @Experimental | ||
| @Internal | ||
| public class BeamTableStatistics implements Serializable, Statistic { | ||
| public static final BeamTableStatistics 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; | ||
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| private BeamTableStatistics(Double rowCount, Double rate, boolean isUnknown) { | ||
| this.rowCount = rowCount; | ||
| this.rate = rate; | ||
| this.unknown = isUnknown; | ||
| } | ||
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| private BeamTableStatistics(Double rowCount, Double rate) { | ||
| this(rowCount, rate, false); | ||
| } | ||
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| public static BeamTableStatistics createBoundedTableStatistics(Double rowCount) { | ||
| return new BeamTableStatistics(rowCount, 0d); | ||
| } | ||
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| public static BeamTableStatistics createUnboundedTableStatistics(Double rate) { | ||
| return new BeamTableStatistics(0d, rate); | ||
| } | ||
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| public Double getRate() { | ||
| return rate; | ||
| } | ||
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| public boolean isUnknown() { | ||
| return unknown; | ||
| } | ||
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| @Override | ||
| public Double getRowCount() { | ||
| return rowCount; | ||
| } | ||
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| @Override | ||
| public boolean isKey(ImmutableBitSet columns) { | ||
| return false; | ||
| } | ||
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| @Override | ||
| public List<RelReferentialConstraint> getReferentialConstraints() { | ||
| return ImmutableList.of(); | ||
| } | ||
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| @Override | ||
| public List<RelCollation> getCollations() { | ||
| return ImmutableList.of(); | ||
| } | ||
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| @Override | ||
| public RelDistribution getDistribution() { | ||
| return RelDistributionTraitDef.INSTANCE.getDefault(); | ||
| } | ||
| } |
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