julianhyde commented on code in PR #3837: URL: https://github.com/apache/calcite/pull/3837#discussion_r1667095366
########## core/src/main/java/org/apache/calcite/rel/metadata/RelMdMeasure.java: ########## @@ -0,0 +1,214 @@ +/* + * 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.calcite.rel.metadata; + +import org.apache.calcite.plan.volcano.RelSubset; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rel.core.Aggregate; +import org.apache.calcite.rel.core.AggregateCall; +import org.apache.calcite.rel.core.Filter; +import org.apache.calcite.rel.core.Project; +import org.apache.calcite.rel.type.RelDataType; +import org.apache.calcite.rex.RexCall; +import org.apache.calcite.rex.RexCorrelVariable; +import org.apache.calcite.rex.RexInputRef; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.rex.RexShuttle; +import org.apache.calcite.rex.RexSubQuery; +import org.apache.calcite.sql.SqlKind; +import org.apache.calcite.sql.fun.SqlStdOperatorTable; +import org.apache.calcite.sql.type.SqlTypeUtil; +import org.apache.calcite.tools.RelBuilder; + +import org.checkerframework.checker.nullness.qual.Nullable; + +import java.util.ArrayList; +import java.util.List; +import java.util.function.Supplier; + +import static com.google.common.collect.Iterables.getOnlyElement; + +/** + * Default implementations of the + * {@link org.apache.calcite.rel.metadata.BuiltInMetadata.Measure} + * metadata provider for the standard logical algebra. + * + * @see org.apache.calcite.rel.metadata.RelMetadataQuery#isMeasure + * @see org.apache.calcite.rel.metadata.RelMetadataQuery#expand + */ +public class RelMdMeasure + implements MetadataHandler<BuiltInMetadata.Measure> { + public static final RelMetadataProvider SOURCE = ReflectiveRelMetadataProvider + .reflectiveSource(new RelMdMeasure(), BuiltInMetadata.Measure.Handler.class); + + @Override public MetadataDef<BuiltInMetadata.Measure> getDef() { + return BuiltInMetadata.Measure.DEF; + } + + /** Catch-all implementation for + * {@link BuiltInMetadata.Measure#isMeasure(int)}, + * invoked using reflection. + */ + public Boolean isMeasure(RelNode rel, RelMetadataQuery mq, int column) { + return false; + } + + /** Catch-all implementation for + * {@link BuiltInMetadata.Measure#expand(int, BuiltInMetadata.Measure.Context)}, + * invoked using reflection. + */ + public RexNode expand(RelNode rel, RelMetadataQuery mq, int column, + BuiltInMetadata.Measure.Context context) { + throw new UnsupportedOperationException("expand(" + rel + ", " + column + + ", " + context); + } + + /** Refines {@code expand} for {@link RelSubset}; called via reflection. */ + public RexNode expand(RelSubset subset, RelMetadataQuery mq, int column, + BuiltInMetadata.Measure.Context context) { + for (RelNode rel : subset.getRels()) { + // Does not loop. We assume that every RelNode can expand. + return mq.expand(rel, column, context); + } + return expand((RelNode) subset, mq, column, context); + } + + /** Refines {@code expand} for {@link Filter}; called via reflection. */ + public RexNode expand(Filter filter, RelMetadataQuery mq, + int column, BuiltInMetadata.Measure.Context context) { + return mq.expand(filter.getInput().stripped(), column, context); + } + + /** Refines {@code expand} for {@link Project}; called via reflection. */ + public @Nullable RexNode expand(Project project, RelMetadataQuery mq, + int column, BuiltInMetadata.Measure.Context context) { + final RexNode e = project.getProjects().get(column); + final BuiltInMetadata.Measure.Context context2 = + Contexts.forProject(project, context); + switch (e.getKind()) { + default: Review Comment: I don't recall. Fixed. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
