zabetak commented on a change in pull request #1020: [CALCITE-2812] Add algebraic operators to allow expressing recursive queries (Ruben Quesada Lopez) URL: https://github.com/apache/calcite/pull/1020#discussion_r276224848
########## File path: core/src/main/java/org/apache/calcite/adapter/enumerable/EnumerableRepeatUnionRule.java ########## @@ -0,0 +1,55 @@ +/* + * 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.adapter.enumerable; + +import org.apache.calcite.plan.Convention; +import org.apache.calcite.plan.RelTraitSet; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rel.convert.ConverterRule; +import org.apache.calcite.rel.logical.LogicalRepeatUnion; + +/** + * Rule to convert a {@link LogicalRepeatUnion} into an {@link EnumerableRepeatUnion}. + */ +public class EnumerableRepeatUnionRule extends ConverterRule { + + public EnumerableRepeatUnionRule() { + super( + LogicalRepeatUnion.class, + Convention.NONE, + EnumerableConvention.INSTANCE, + "EnumerableRepeatUnionRule"); + + } + + @Override public RelNode convert(RelNode rel) { + LogicalRepeatUnion union = (LogicalRepeatUnion) rel; + EnumerableConvention out = EnumerableConvention.INSTANCE; + RelTraitSet traitSet = union.getTraitSet().replace(out); + RelNode seedRel = union.getSeedRel(); + RelNode iterativeRel = union.getIterativeRel(); + + return new EnumerableRepeatUnion( Review comment: Most (if not all) enumerable operators include a static factory method which takes into account deducing collation and distribution. Shouldn't we include one? ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
