zstan commented on code in PR #12815: URL: https://github.com/apache/ignite/pull/12815#discussion_r2887896119
########## modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/rule/logical/IgniteLogicalWindowRewriteRule.java: ########## @@ -0,0 +1,403 @@ +/* + * 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.ignite.internal.processors.query.calcite.rule.logical; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.stream.Collectors; +import com.google.common.collect.ImmutableSet; +import org.apache.calcite.plan.RelOptRule; +import org.apache.calcite.plan.RelOptRuleCall; +import org.apache.calcite.plan.RelRule; +import org.apache.calcite.rel.RelCollations; +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.JoinRelType; +import org.apache.calcite.rel.core.Window; +import org.apache.calcite.rel.logical.LogicalAggregate; +import org.apache.calcite.rel.logical.LogicalJoin; +import org.apache.calcite.rel.logical.LogicalProject; +import org.apache.calcite.rel.logical.LogicalWindow; +import org.apache.calcite.rel.type.RelDataType; +import org.apache.calcite.rel.type.RelDataTypeFactory; +import org.apache.calcite.rex.RexBuilder; +import org.apache.calcite.rex.RexInputRef; +import org.apache.calcite.rex.RexLiteral; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.rex.RexUtil; +import org.apache.calcite.rex.RexWindowBound; +import org.apache.calcite.sql.SqlAggFunction; +import org.apache.calcite.sql.SqlOperatorBinding; +import org.apache.calcite.sql.fun.SqlStdOperatorTable; +import org.apache.calcite.util.ImmutableBitSet; +import org.apache.ignite.internal.processors.cache.query.IgniteQueryErrorCode; +import org.apache.ignite.internal.processors.query.IgniteSQLException; +import org.immutables.value.Value; + +/** + * Rule that rewrites LogicalWindow to LogicalAggregate LogicalJoin LogicalProject. + * This approach is valid only for unbounded frame. + */ [email protected] +public class IgniteLogicalWindowRewriteRule extends RelRule<IgniteLogicalWindowRewriteRule.Config> { + /** Rule instance. */ + public static final RelOptRule INSTANCE = Config.DEFAULT.toRule(); + + /** + * Constructor. + * + * @param config Rule configuration. + */ + private IgniteLogicalWindowRewriteRule(Config config) { + super(config); + } + + /** {@inheritDoc} */ + @Override public void onMatch(RelOptRuleCall call) { + LogicalWindow win = call.rel(0); + + if (win.groups.size() > 1) { + RelNode input = win.getInput(); + RelDataTypeFactory typeFactory = win.getCluster().getTypeFactory(); + + for (LogicalWindow.Group grp : win.groups) { + RelDataType joinRowType = buildWindowRowType(typeFactory, input, grp); + + LogicalWindow single = LogicalWindow.create( + input.getTraitSet(), + input, + win.getConstants(), + joinRowType, + List.of(grp) + ); + + input = single; + } + + call.transformTo(input); + + return; + } + + LogicalWindow.Group grp = win.groups.get(0); + + validateSupported(grp); + + RelNode input = win.getInput(); + RexBuilder rexBuilder = win.getCluster().getRexBuilder(); + RelDataTypeFactory typeFactory = win.getCluster().getTypeFactory(); + RelNode aggInput = appendConstants(input, win.getConstants()); + + ImmutableBitSet grpSet = grp.keys; + + List<AggregateCall> aggCalls = new ArrayList<>(grp.aggCalls.size()); + + for (Window.RexWinAggCall winAggCall : grp.aggCalls) { + aggCalls.add(toAggregateCall(winAggCall, typeFactory, grpSet.cardinality())); + } + + RelNode agg = LogicalAggregate.create( + aggInput, + grpSet, + null, + aggCalls + ); + + RexNode condition = buildPartitionJoinCondition(rexBuilder, typeFactory, input, agg, grpSet); + + RelNode join = LogicalJoin.create( + input, + agg, + Collections.emptyList(), + condition, + Collections.emptySet(), + JoinRelType.INNER + ); + + RelNode project = LogicalProject.create( + join, + List.of(), + buildProjection(join, win, grp), + win.getRowType().getFieldNames(), + ImmutableSet.of() + ); + + call.transformTo(project); + } + + /** + * Appends LogicalWindow constants to input as additional projection columns. + * + * @param input Input relation. + * @param constants Window constants. + * @return Input relation augmented with constants. + */ + private static RelNode appendConstants(RelNode input, List<RexLiteral> constants) { + if (constants.isEmpty()) + return input; + + RexBuilder rexBuilder = input.getCluster().getRexBuilder(); + int inputFieldCnt = input.getRowType().getFieldCount(); + + List<RexNode> projects = new ArrayList<>(inputFieldCnt + constants.size()); + List<String> names = new ArrayList<>(input.getRowType().getFieldNames()); + + for (int i = 0; i < inputFieldCnt; i++) + projects.add(rexBuilder.makeInputRef(input, i)); + + projects.addAll(constants); + + for (int i = 0; i < constants.size(); i++) + names.add("_w_const$" + i); + + return LogicalProject.create(input, List.of(), projects, names, ImmutableSet.of()); Review Comment: lest push here default for constant namings ? ie: ```suggestion return LogicalProject.create(input, List.of(), projects, (List<String>) null, ImmutableSet.of()); 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