rubenada commented on a change in pull request #2329: URL: https://github.com/apache/calcite/pull/2329#discussion_r562055776
########## File path: core/src/main/java/org/apache/calcite/adapter/enumerable/EnumerableMergeUnionRule.java ########## @@ -0,0 +1,97 @@ +/* + * 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.RelOptRuleCall; +import org.apache.calcite.plan.RelRule; +import org.apache.calcite.rel.RelCollation; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rel.core.Sort; +import org.apache.calcite.rel.core.Union; +import org.apache.calcite.rel.logical.LogicalSort; +import org.apache.calcite.rel.logical.LogicalUnion; +import org.apache.calcite.rex.RexLiteral; +import org.apache.calcite.rex.RexNode; + +import java.util.ArrayList; +import java.util.List; + +/** + * Rule to convert a {@link org.apache.calcite.rel.logical.LogicalSort} on top of a + * {@link org.apache.calcite.rel.logical.LogicalUnion} into a {@link EnumerableMergeUnion}. + * + * @see EnumerableRules#ENUMERABLE_MERGE_UNION_RULE + */ +public class EnumerableMergeUnionRule extends RelRule<EnumerableMergeUnionRule.Config> { + + /** Rule configuration. */ + public interface Config extends RelRule.Config { + Config DEFAULT_CONFIG = EMPTY.withDescription("EnumerableMergeUnionRule").withOperandSupplier( + b0 -> b0.operand(LogicalSort.class).oneInput( + b1 -> b1.operand(LogicalUnion.class).anyInputs())).as(Config.class); + + @Override default EnumerableMergeUnionRule toRule() { + return new EnumerableMergeUnionRule(this); + } + } + + public EnumerableMergeUnionRule(Config config) { + super(config); + } + + @Override public void onMatch(RelOptRuleCall call) { + final Sort sort = call.rel(0); + final RelCollation collation = sort.getCollation(); + if (collation == null || collation.getFieldCollations().isEmpty()) { Review comment: matches method overridden with checks ########## File path: core/src/main/java/org/apache/calcite/adapter/enumerable/EnumerableMergeUnion.java ########## @@ -0,0 +1,118 @@ +/* + * 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.linq4j.Ord; +import org.apache.calcite.linq4j.tree.BlockBuilder; +import org.apache.calcite.linq4j.tree.Expression; +import org.apache.calcite.linq4j.tree.Expressions; +import org.apache.calcite.linq4j.tree.ParameterExpression; +import org.apache.calcite.plan.RelOptCluster; +import org.apache.calcite.plan.RelTraitSet; +import org.apache.calcite.rel.RelCollation; +import org.apache.calcite.rel.RelCollations; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.util.BuiltInMethod; +import org.apache.calcite.util.Pair; +import org.apache.calcite.util.Util; + +import java.util.ArrayList; +import java.util.List; + +/** Implementation of {@link org.apache.calcite.rel.core.Union} in + * {@link org.apache.calcite.adapter.enumerable.EnumerableConvention enumerable calling convention}. + * Performs a union (or union all) of all its inputs (which must be already sorted), + * respecting the order. */ +public class EnumerableMergeUnion extends EnumerableUnion { + + protected EnumerableMergeUnion(RelOptCluster cluster, RelTraitSet traitSet, List<RelNode> inputs, + boolean all) { + super(cluster, traitSet, inputs, all); + final RelCollation collation = traitSet.getCollation(); + if (collation == null || collation == RelCollations.EMPTY) { + throw new IllegalArgumentException("EnumerableMergeUnion with no collation"); + } + for (RelNode input : inputs) { + final RelCollation inputCollation = input.getTraitSet().getCollation(); + if (inputCollation == null || !inputCollation.satisfies(collation)) { + throw new IllegalArgumentException("EnumerableMergeUnion input does not satisfy collation " + + input); Review comment: exception message improved ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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