jcamachor commented on a change in pull request #1002: URL: https://github.com/apache/hive/pull/1002#discussion_r418784851
########## File path: ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveInBetweenExpandRule.java ########## @@ -0,0 +1,198 @@ +/* + * 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.hadoop.hive.ql.optimizer.calcite.rules; + +import java.util.ArrayList; +import java.util.List; +import org.apache.calcite.plan.RelOptRule; +import org.apache.calcite.plan.RelOptRuleCall; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rel.core.Filter; +import org.apache.calcite.rel.core.Join; +import org.apache.calcite.rel.core.Project; +import org.apache.calcite.rex.RexBuilder; +import org.apache.calcite.rex.RexCall; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.rex.RexShuttle; +import org.apache.calcite.rex.RexUtil; +import org.apache.calcite.sql.fun.SqlStdOperatorTable; +import org.apache.hadoop.hive.ql.optimizer.calcite.HiveRelFactories; +import org.apache.hadoop.hive.ql.optimizer.calcite.translator.RexNodeConverter; + +/** + * This class contains rules to rewrite IN/BETWEEN clauses into their + * corresponding AND/OR versions. + * It is the counterpart to {@link HivePointLookupOptimizerRule}. + */ +public class HiveInBetweenExpandRule { + + public static final FilterRule FILTER_INSTANCE = new FilterRule(); + public static final JoinRule JOIN_INSTANCE = new JoinRule(); + public static final ProjectRule PROJECT_INSTANCE = new ProjectRule(); + + /** Rule adapter to apply the transformation to Filter conditions. */ + private static class FilterRule extends RelOptRule { + + FilterRule() { + super(operand(Filter.class, any()), HiveRelFactories.HIVE_BUILDER, null); + } + + @Override + public void onMatch(RelOptRuleCall call) { + final Filter filter = call.rel(0); + RexInBetweenExpander expander = new RexInBetweenExpander( + filter.getCluster().getRexBuilder()); + RexNode condition = expander.apply(filter.getCondition()); + + if (!expander.modified) { + return; + } + + RelNode newFilter = filter.copy(filter.getTraitSet(), + filter.getInput(), condition); + + call.transformTo(newFilter); + } + } + + /** Rule adapter to apply the transformation to Join conditions. */ + private static class JoinRule extends RelOptRule { + + JoinRule() { + super(operand(Join.class, any()), HiveRelFactories.HIVE_BUILDER, null); + } + + @Override + public void onMatch(RelOptRuleCall call) { + final Join join = call.rel(0); + RexInBetweenExpander expander = new RexInBetweenExpander( + join.getCluster().getRexBuilder()); + RexNode condition = expander.apply(join.getCondition()); + + if (!expander.modified) { + return; + } + + RelNode newJoin = join.copy(join.getTraitSet(), + condition, + join.getLeft(), + join.getRight(), + join.getJoinType(), + join.isSemiJoinDone()); + + call.transformTo(newJoin); + } + } + + /** Rule adapter to apply the transformation to Project expressions. */ + private static class ProjectRule extends RelOptRule { + + ProjectRule() { + super(operand(Project.class, any()), HiveRelFactories.HIVE_BUILDER, null); + } + + @Override + public void onMatch(RelOptRuleCall call) { + final Project project = call.rel(0); + RexInBetweenExpander expander = new RexInBetweenExpander( + project.getCluster().getRexBuilder()); + List<RexNode> newProjects = new ArrayList<>(); + for (RexNode expr : project.getProjects()) { + newProjects.add(expander.apply(expr)); + } + + if (!expander.modified) { + return; + } + + Project newProject = project.copy(project.getTraitSet(), + project.getInput(), newProjects, project.getRowType()); + + call.transformTo(newProject); + } + } + + + /** + * Class that transforms IN/BETWEEN clauses in an expression. + * If any call is modified, the modified flag will be set to + * true after its execution. + */ + private static final class RexInBetweenExpander extends RexShuttle { + + private final RexBuilder rexBuilder; + private boolean modified; + + private RexInBetweenExpander(RexBuilder rexBuilder) { + this.rexBuilder = rexBuilder; + this.modified = false; + } + + @Override + public RexNode visitCall(final RexCall call) { + switch (call.getKind()) { + case AND: { + boolean[] update = {false}; + List<RexNode> newOperands = visitList(call.operands, update); + if (update[0]) { + return RexUtil.composeConjunction(rexBuilder, newOperands); + } + return call; + } + case OR: { + boolean[] update = {false}; + List<RexNode> newOperands = visitList(call.operands, update); + if (update[0]) { + return RexUtil.composeDisjunction(rexBuilder, newOperands); + } + return call; + } + case IN: { + List<RexNode> newOperands = RexNodeConverter.transformInToOrOperands( + call.getOperands(), rexBuilder); + if (newOperands == null) { + // We could not execute transformation, return expression + return call; + } + modified = true; + if (newOperands.size() > 1) { + return rexBuilder.makeCall(SqlStdOperatorTable.OR, newOperands); + } + return newOperands.get(0); + } + case BETWEEN: { + List<RexNode> newOperands = RexNodeConverter.rewriteBetweenChildren( + call.getOperands(), rexBuilder); + modified = true; + if (call.getOperands().get(0).isAlwaysTrue()) { Review comment: The first parameter to BETWEEN is a boolean flag, to differentiate BETWEEN and NOT BETWEEN. `a BETWEEN b AND c` => `b <= a AND a <= c` `a NOT BETWEEN b AND c` => `b > a OR a > c` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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