| /* |
| * 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.drill.exec.store.druid; |
| |
| import org.apache.calcite.plan.RelOptRuleCall; |
| import org.apache.calcite.rex.RexNode; |
| import org.apache.drill.common.expression.LogicalExpression; |
| import org.apache.drill.exec.planner.logical.DrillOptiq; |
| import org.apache.drill.exec.planner.logical.DrillParseContext; |
| import org.apache.drill.exec.planner.logical.RelOptHelper; |
| import org.apache.drill.exec.planner.physical.FilterPrel; |
| import org.apache.drill.exec.planner.physical.PrelUtil; |
| import org.apache.drill.exec.planner.physical.ScanPrel; |
| import org.apache.drill.exec.store.StoragePluginOptimizerRule; |
| import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableList; |
| |
| public class DruidPushDownFilterForScan extends StoragePluginOptimizerRule { |
| |
| public static final StoragePluginOptimizerRule INSTANCE = new DruidPushDownFilterForScan(); |
| |
| private DruidPushDownFilterForScan() { |
| super( |
| RelOptHelper.some(FilterPrel.class, RelOptHelper.any(ScanPrel.class)), |
| "DruidPushDownFilterForScan"); |
| } |
| |
| @Override |
| public void onMatch(RelOptRuleCall relOptRuleCall) { |
| final ScanPrel scan = relOptRuleCall.rel(1); |
| final FilterPrel filter = relOptRuleCall.rel(0); |
| final RexNode condition = filter.getCondition(); |
| |
| DruidGroupScan groupScan = (DruidGroupScan) scan.getGroupScan(); |
| if (groupScan.isFilterPushedDown()) { |
| return; |
| } |
| |
| LogicalExpression conditionExp = |
| DrillOptiq.toDrill( |
| new DrillParseContext(PrelUtil.getPlannerSettings(relOptRuleCall.getPlanner())), |
| scan, |
| condition); |
| |
| DruidFilterBuilder druidFilterBuilder = |
| new DruidFilterBuilder(groupScan, conditionExp); |
| |
| DruidScanSpec newScanSpec = druidFilterBuilder.parseTree(); |
| if (newScanSpec == null) { |
| return; // no filter pushdown so nothing to apply. |
| } |
| |
| DruidGroupScan newGroupsScan = |
| new DruidGroupScan( |
| groupScan.getUserName(), |
| groupScan.getStoragePlugin(), |
| newScanSpec, |
| groupScan.getColumns(), |
| groupScan.getMaxRecordsToRead()); |
| newGroupsScan.setFilterPushedDown(true); |
| |
| ScanPrel newScanPrel = scan.copy(filter.getTraitSet(), newGroupsScan, filter.getRowType()); |
| if (druidFilterBuilder.isAllExpressionsConverted()) { |
| /* |
| * Since we could convert the entire filter condition expression into a |
| * Druid filter, we can eliminate the filter operator altogether. |
| */ |
| relOptRuleCall.transformTo(newScanPrel); |
| } else { |
| relOptRuleCall.transformTo(filter.copy(filter.getTraitSet(), |
| ImmutableList.of(newScanPrel))); |
| } |
| } |
| |
| @Override |
| public boolean matches(RelOptRuleCall call) { |
| final ScanPrel scan = call.rel(1); |
| if (scan.getGroupScan() instanceof DruidGroupScan) { |
| return super.matches(call); |
| } |
| return false; |
| } |
| } |