| /* |
| * 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.drill.common.FunctionNames; |
| import org.apache.drill.common.expression.BooleanOperator; |
| import org.apache.drill.common.expression.FunctionCall; |
| import org.apache.drill.common.expression.LogicalExpression; |
| import org.apache.drill.common.expression.visitors.AbstractExprVisitor; |
| import org.apache.drill.exec.store.druid.common.DruidFilter; |
| import org.apache.drill.exec.store.druid.common.DruidUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.List; |
| |
| public class DruidFilterBuilder extends |
| AbstractExprVisitor<DruidScanSpec, Void, RuntimeException> { |
| |
| private static final Logger logger = LoggerFactory.getLogger(DruidFilterBuilder.class); |
| |
| private final DruidGroupScan groupScan; |
| private final LogicalExpression le; |
| private final DruidScanSpecBuilder druidScanSpecBuilder; |
| private boolean allExpressionsConverted = true; |
| |
| public DruidFilterBuilder(DruidGroupScan groupScan, |
| LogicalExpression conditionExp) { |
| this.groupScan = groupScan; |
| this.le = conditionExp; |
| this.druidScanSpecBuilder = new DruidScanSpecBuilder(); |
| } |
| |
| public DruidScanSpec parseTree() { |
| logger.debug("DruidScanSpec parseTree() called."); |
| DruidScanSpec parsedSpec = le.accept(this, null); |
| if (parsedSpec != null) { |
| parsedSpec = |
| mergeScanSpecs( |
| FunctionNames.AND, |
| this.groupScan.getScanSpec(), |
| parsedSpec |
| ); |
| } |
| return parsedSpec; |
| } |
| |
| private DruidScanSpec mergeScanSpecs(String functionName, |
| DruidScanSpec leftScanSpec, |
| DruidScanSpec rightScanSpec) { |
| logger.debug("mergeScanSpecs called for functionName - {}", functionName); |
| |
| DruidFilter newFilter = null; |
| |
| switch (functionName) { |
| case FunctionNames.AND: |
| if (leftScanSpec.getFilter() != null |
| && rightScanSpec.getFilter() != null) { |
| newFilter = |
| DruidUtils |
| .andFilterAtIndex( |
| leftScanSpec.getFilter(), |
| rightScanSpec.getFilter() |
| ); |
| } else if (leftScanSpec.getFilter() != null) { |
| newFilter = leftScanSpec.getFilter(); |
| } else { |
| newFilter = rightScanSpec.getFilter(); |
| } |
| break; |
| case FunctionNames.OR: |
| newFilter = |
| DruidUtils |
| .orFilterAtIndex( |
| leftScanSpec.getFilter(), |
| rightScanSpec.getFilter() |
| ); |
| } |
| |
| return new DruidScanSpec( |
| groupScan.getScanSpec().getDataSourceName(), |
| newFilter, |
| groupScan.getScanSpec().getDataSourceSize(), |
| groupScan.getScanSpec().getDataSourceMinTime(), |
| groupScan.getScanSpec().getDataSourceMaxTime()); |
| } |
| |
| public boolean isAllExpressionsConverted() { |
| return allExpressionsConverted; |
| } |
| |
| @Override |
| public DruidScanSpec visitUnknown(LogicalExpression e, Void value) |
| throws RuntimeException { |
| allExpressionsConverted = false; |
| return null; |
| } |
| |
| @Override |
| public DruidScanSpec visitBooleanOperator(BooleanOperator op, Void value) { |
| List<LogicalExpression> args = op.args(); |
| DruidScanSpec nodeScanSpec = null; |
| String functionName = op.getName(); |
| |
| logger.debug("visitBooleanOperator Called. FunctionName - {}", functionName); |
| |
| for (LogicalExpression arg : args) { |
| switch (functionName) { |
| case FunctionNames.AND: |
| case FunctionNames.OR: |
| if (nodeScanSpec == null) { |
| nodeScanSpec = arg.accept(this, null); |
| } else { |
| DruidScanSpec scanSpec = arg.accept(this, null); |
| if (scanSpec != null) { |
| nodeScanSpec = mergeScanSpecs(functionName, nodeScanSpec, scanSpec); |
| } else { |
| allExpressionsConverted = false; |
| } |
| } |
| break; |
| } |
| } |
| return nodeScanSpec; |
| } |
| |
| @Override |
| public DruidScanSpec visitFunctionCall(FunctionCall call, Void value) |
| throws RuntimeException { |
| DruidScanSpec nodeScanSpec = null; |
| String functionName = call.getName(); |
| List<LogicalExpression> args = call.args(); |
| |
| logger.debug("visitFunctionCall Called. FunctionName - {}", functionName); |
| |
| if (DruidCompareFunctionProcessor.isCompareFunction(functionName)) { |
| DruidCompareFunctionProcessor processor = DruidCompareFunctionProcessor |
| .process(call); |
| if (processor.isSuccess()) { |
| DruidScanSpec scanSpec = groupScan.getScanSpec(); |
| nodeScanSpec = |
| druidScanSpecBuilder |
| .build(scanSpec.getDataSourceName(), |
| scanSpec.getDataSourceSize(), |
| scanSpec.getDataSourceMinTime(), |
| scanSpec.getDataSourceMaxTime(), |
| processor.getFunctionName(), |
| processor.getPath(), |
| processor.getValue() |
| ); |
| } |
| } else { |
| switch (functionName) { |
| case FunctionNames.AND: |
| case FunctionNames.OR: |
| DruidScanSpec leftScanSpec = args.get(0).accept(this, null); |
| DruidScanSpec rightScanSpec = args.get(1).accept(this, null); |
| if (leftScanSpec != null && rightScanSpec != null) { |
| nodeScanSpec = |
| mergeScanSpecs(functionName, leftScanSpec, rightScanSpec); |
| } else { |
| allExpressionsConverted = false; |
| if (FunctionNames.AND.equals(functionName)) { |
| nodeScanSpec = leftScanSpec == null ? rightScanSpec : leftScanSpec; |
| } |
| } |
| break; |
| } |
| } |
| |
| if (nodeScanSpec == null) { |
| allExpressionsConverted = false; |
| } |
| |
| return nodeScanSpec; |
| } |
| } |