| /* |
| * 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.iotdb.db.queryengine.plan.expression.visitor.cartesian; |
| |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.commons.path.PathPatternTree; |
| import org.apache.iotdb.db.queryengine.plan.expression.Expression; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.ConstantOperand; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.TimeSeriesOperand; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.TimestampOperand; |
| import org.apache.iotdb.db.queryengine.plan.expression.multi.FunctionExpression; |
| import org.apache.iotdb.db.utils.constant.SqlConstant; |
| import org.apache.iotdb.tsfile.common.constant.TsFileConstant; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import static org.apache.iotdb.db.queryengine.plan.analyze.ExpressionUtils.cartesianProduct; |
| import static org.apache.iotdb.db.queryengine.plan.analyze.ExpressionUtils.reconstructFunctionExpressions; |
| import static org.apache.iotdb.db.queryengine.plan.analyze.ExpressionUtils.reconstructTimeSeriesOperands; |
| |
| public class ConcatExpressionWithSuffixPathsVisitor |
| extends CartesianProductVisitor<ConcatExpressionWithSuffixPathsVisitor.Context> { |
| @Override |
| public List<Expression> visitFunctionExpression( |
| FunctionExpression functionExpression, Context context) { |
| List<List<Expression>> extendedExpressions = new ArrayList<>(); |
| if (SqlConstant.COUNT_IF.equalsIgnoreCase(functionExpression.getFunctionName())) { |
| // We just process first input Expression of Count_IF, |
| // keep other input Expressions as origin |
| extendedExpressions.add(process(functionExpression.getExpressions().get(0), context)); |
| List<Expression> children = functionExpression.getExpressions(); |
| for (int i = 1; i < children.size(); i++) { |
| extendedExpressions.add(Collections.singletonList(children.get(i))); |
| } |
| } else { |
| functionExpression |
| .getExpressions() |
| .forEach(expression -> extendedExpressions.add(process(expression, context))); |
| } |
| |
| List<List<Expression>> childExpressionsList = new ArrayList<>(); |
| cartesianProduct(extendedExpressions, childExpressionsList, 0, new ArrayList<>()); |
| return reconstructFunctionExpressions(functionExpression, childExpressionsList); |
| } |
| |
| @Override |
| public List<Expression> visitTimeSeriesOperand( |
| TimeSeriesOperand timeSeriesOperand, Context context) { |
| PartialPath rawPath = timeSeriesOperand.getPath(); |
| List<PartialPath> actualPaths = new ArrayList<>(); |
| if (rawPath.getFullPath().startsWith(SqlConstant.ROOT + TsFileConstant.PATH_SEPARATOR)) { |
| actualPaths.add(rawPath); |
| context.getPatternTree().appendPathPattern(rawPath); |
| } else { |
| for (PartialPath prefixPath : context.getPrefixPaths()) { |
| PartialPath concatPath = prefixPath.concatPath(rawPath); |
| context.getPatternTree().appendPathPattern(concatPath); |
| actualPaths.add(concatPath); |
| } |
| } |
| return reconstructTimeSeriesOperands(timeSeriesOperand, actualPaths); |
| } |
| |
| @Override |
| public List<Expression> visitTimeStampOperand( |
| TimestampOperand timestampOperand, Context context) { |
| return Collections.singletonList(timestampOperand); |
| } |
| |
| @Override |
| public List<Expression> visitConstantOperand(ConstantOperand constantOperand, Context context) { |
| return Collections.singletonList(constantOperand); |
| } |
| |
| public static class Context { |
| private final List<PartialPath> prefixPaths; |
| private final PathPatternTree patternTree; |
| |
| public Context(List<PartialPath> prefixPaths, PathPatternTree patternTree) { |
| this.prefixPaths = prefixPaths; |
| this.patternTree = patternTree; |
| } |
| |
| public List<PartialPath> getPrefixPaths() { |
| return prefixPaths; |
| } |
| |
| public PathPatternTree getPatternTree() { |
| return patternTree; |
| } |
| } |
| } |