| /* |
| * 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.planner; |
| |
| import static org.apache.beam.sdk.util.Preconditions.checkArgumentNotNull; |
| |
| import java.util.List; |
| import java.util.stream.Collectors; |
| import org.apache.beam.sdk.extensions.sql.impl.rel.BeamRelNode; |
| import org.apache.beam.vendor.calcite.v1_28_0.com.google.common.collect.Table; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rel.RelNode; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rel.metadata.MetadataDef; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rel.metadata.MetadataHandler; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rel.metadata.ReflectiveRelMetadataProvider; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rel.metadata.RelMetadataProvider; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rel.metadata.RelMetadataQuery; |
| |
| /** |
| * This is the implementation of NodeStatsMetadata. Methods to estimate rate and row count for |
| * Calcite's logical nodes be implemented here. |
| */ |
| @SuppressWarnings({ |
| "rawtypes" // TODO(https://github.com/apache/beam/issues/20447) |
| }) |
| public class RelMdNodeStats implements MetadataHandler<NodeStatsMetadata> { |
| |
| public static final RelMetadataProvider SOURCE = |
| ReflectiveRelMetadataProvider.reflectiveSource( |
| NodeStatsMetadata.METHOD, new RelMdNodeStats()); |
| |
| @Override |
| public MetadataDef<NodeStatsMetadata> getDef() { |
| return NodeStatsMetadata.DEF; |
| } |
| |
| @SuppressWarnings("UnusedDeclaration") |
| public NodeStats getNodeStats(RelNode rel, RelMetadataQuery mq) { |
| assert mq instanceof BeamRelMetadataQuery; |
| BeamRelMetadataQuery bmq = (BeamRelMetadataQuery) mq; |
| |
| if (rel instanceof BeamRelNode) { |
| return this.getBeamNodeStats((BeamRelNode) rel, bmq); |
| } |
| |
| // We can later define custom methods for all different RelNodes to prevent hitting this point. |
| // Similar to RelMdRowCount in calcite. |
| |
| return NodeStats.UNKNOWN; |
| } |
| |
| private NodeStats getBeamNodeStats(BeamRelNode rel, BeamRelMetadataQuery mq) { |
| |
| // Removing the unknown results. |
| // Calcite caches previous results in mq.map. This is done to prevent cyclic calls of this |
| // method and also improving the performance. However, we might have returned an unknown result |
| // because one of the inputs of the node was unknown (it is a logical node that we have not |
| // implemented getNodeStats for it). Later we should not get the Unknown, therefore we need to |
| // remove unknown results everyTime that this method is called. |
| // Results are also cached in CachingRelMetadataProvider because calcite PlannerImpl#Transform |
| // wraps the metadata provider with CachingRelMetadataProvider. However, |
| // CachingRelMetadataProvider checks timestamp before returning previous results. Therefore, |
| // there wouldn't be a problem in that case. |
| List<Table.Cell<RelNode, List, Object>> keys = |
| mq.map.cellSet().stream() |
| .filter(entry -> entry != null) |
| .filter(entry -> entry.getValue() != null) |
| .filter(entry -> entry.getValue() instanceof NodeStats) |
| .filter(entry -> checkArgumentNotNull((NodeStats) entry.getValue()).isUnknown()) |
| .collect(Collectors.toList()); |
| |
| keys.forEach(cell -> mq.map.remove(cell.getRowKey(), cell.getColumnKey())); |
| |
| return rel.estimateNodeStats(mq); |
| } |
| } |