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[Enhancement] support partition-level cardinality estimation (backport …
…#51513) (#51749) Co-authored-by: Murphy <[email protected]>
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38 changes: 38 additions & 0 deletions
38
fe/fe-core/src/main/java/com/starrocks/sql/optimizer/statistics/PartitionStats.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| // Copyright 2021-present StarRocks, Inc. All rights reserved. | ||
| // | ||
| // Licensed 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 | ||
| // | ||
| // https://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. | ||
|
|
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| package com.starrocks.sql.optimizer.statistics; | ||
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| import com.google.common.collect.Maps; | ||
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| import java.util.Map; | ||
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| /** | ||
| * Partition-level statistics | ||
| */ | ||
| public class PartitionStats { | ||
| public final Map<Long, Double> distinctCount; | ||
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| public PartitionStats() { | ||
| this.distinctCount = Maps.newHashMap(); | ||
| } | ||
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| public PartitionStats(Map<Long, Double> distinctCount) { | ||
| this.distinctCount = distinctCount; | ||
| } | ||
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| public Map<Long, Double> getDistinctCount() { | ||
| return distinctCount; | ||
| } | ||
| } |
80 changes: 80 additions & 0 deletions
80
...-core/src/main/java/com/starrocks/sql/optimizer/statistics/PartitionStatsCacheLoader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| // Copyright 2021-present StarRocks, Inc. All rights reserved. | ||
| // | ||
| // Licensed 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 | ||
| // | ||
| // https://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. | ||
|
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| package com.starrocks.sql.optimizer.statistics; | ||
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| import com.github.benmanes.caffeine.cache.AsyncCacheLoader; | ||
| import com.google.common.collect.Lists; | ||
| import com.starrocks.qe.ConnectContext; | ||
| import com.starrocks.statistic.StatisticExecutor; | ||
| import com.starrocks.statistic.StatisticUtils; | ||
| import com.starrocks.thrift.TStatisticData; | ||
| import org.checkerframework.checker.nullness.qual.NonNull; | ||
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| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.CompletionException; | ||
| import java.util.concurrent.Executor; | ||
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| public class PartitionStatsCacheLoader implements AsyncCacheLoader<ColumnStatsCacheKey, Optional<PartitionStats>> { | ||
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| private final StatisticExecutor statisticExecutor = new StatisticExecutor(); | ||
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| @Override | ||
| public @NonNull CompletableFuture<Optional<PartitionStats>> asyncLoad(@NonNull ColumnStatsCacheKey cacheKey, | ||
| @NonNull Executor executor) { | ||
| return asyncLoadAll(Lists.newArrayList(cacheKey), executor).thenApply(x -> x.get(cacheKey)); | ||
| } | ||
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| @Override | ||
| public @NonNull CompletableFuture<Map<ColumnStatsCacheKey, Optional<PartitionStats>>> | ||
| asyncLoadAll(@NonNull Iterable<? extends @NonNull ColumnStatsCacheKey> cacheKey, @NonNull Executor executor) { | ||
| return CompletableFuture.supplyAsync(() -> { | ||
| try { | ||
| ConnectContext connectContext = StatisticUtils.buildConnectContext(); | ||
| connectContext.setThreadLocalInfo(); | ||
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| Map<ColumnStatsCacheKey, Optional<PartitionStats>> result = new HashMap<>(); | ||
| long tableId = -1; | ||
| List<String> columns = Lists.newArrayList(); | ||
| for (ColumnStatsCacheKey statsCacheKey : cacheKey) { | ||
| columns.add(statsCacheKey.column); | ||
| tableId = statsCacheKey.tableId; | ||
| } | ||
| List<TStatisticData> statisticData = statisticExecutor.queryPartitionLevelColumnNDV(connectContext, | ||
| tableId, Lists.newArrayList(), columns); | ||
| for (TStatisticData data : statisticData) { | ||
| ColumnStatsCacheKey key = new ColumnStatsCacheKey(tableId, data.columnName); | ||
| result.computeIfAbsent(key, (x) -> Optional.of(new PartitionStats())) | ||
| .get().getDistinctCount().put(data.partitionId, (double) data.countDistinct); | ||
| } | ||
| for (ColumnStatsCacheKey key : cacheKey) { | ||
| if (!result.containsKey(key)) { | ||
| result.put(key, Optional.empty()); | ||
| } | ||
| } | ||
| return result; | ||
| } catch (RuntimeException e) { | ||
| throw e; | ||
| } catch (Exception e) { | ||
| throw new CompletionException(e); | ||
| } finally { | ||
| ConnectContext.remove(); | ||
| } | ||
| }, executor); | ||
| } | ||
| } |
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