| /* |
| * 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.phoenix.iterate; |
| |
| import java.sql.SQLException; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.hadoop.hbase.client.Scan; |
| import org.apache.phoenix.compile.ExplainPlanAttributes; |
| import org.apache.phoenix.compile.ExplainPlanAttributes |
| .ExplainPlanAttributesBuilder; |
| import org.apache.phoenix.compile.QueryPlan; |
| import org.apache.phoenix.compile.StatementContext; |
| import org.apache.phoenix.monitoring.OverAllQueryMetrics; |
| import org.apache.phoenix.monitoring.ReadMetricQueue; |
| import org.apache.phoenix.query.KeyRange; |
| import org.apache.phoenix.util.ClientUtil; |
| |
| import org.apache.phoenix.thirdparty.com.google.common.collect.Lists; |
| |
| |
| /** |
| * |
| * Create a union ResultIterators |
| * |
| * |
| */ |
| public class UnionResultIterators implements ResultIterators { |
| private final List<KeyRange> splits; |
| private final List<List<Scan>> scans; |
| private final List<PeekingResultIterator> iterators; |
| private final List<ReadMetricQueue> readMetricsList; |
| private final List<OverAllQueryMetrics> overAllQueryMetricsList; |
| private boolean closed; |
| private final StatementContext parentStmtCtx; |
| public UnionResultIterators(List<QueryPlan> plans, StatementContext parentStmtCtx) throws SQLException { |
| this.parentStmtCtx = parentStmtCtx; |
| int nPlans = plans.size(); |
| iterators = Lists.newArrayListWithExpectedSize(nPlans); |
| splits = Lists.newArrayListWithExpectedSize(nPlans * 30); |
| scans = Lists.newArrayListWithExpectedSize(nPlans * 10); |
| readMetricsList = Lists.newArrayListWithCapacity(nPlans); |
| overAllQueryMetricsList = Lists.newArrayListWithCapacity(nPlans); |
| for (QueryPlan plan : plans) { |
| readMetricsList.add(plan.getContext().getReadMetricsQueue()); |
| overAllQueryMetricsList.add(plan.getContext().getOverallQueryMetrics()); |
| iterators.add(LookAheadResultIterator.wrap(plan.iterator())); |
| splits.addAll(plan.getSplits()); |
| scans.addAll(plan.getScans()); |
| } |
| } |
| |
| @Override |
| public List<KeyRange> getSplits() { |
| if (splits == null) |
| return Collections.emptyList(); |
| else |
| return splits; |
| } |
| |
| @Override |
| public void close() throws SQLException { |
| if (!closed) { |
| closed = true; |
| SQLException toThrow = null; |
| try { |
| if (iterators != null) { |
| for (int index=0; index < iterators.size(); index++) { |
| PeekingResultIterator iterator = iterators.get(index); |
| try { |
| iterator.close(); |
| } catch (Exception e) { |
| if (toThrow == null) { |
| toThrow = ClientUtil.parseServerException(e); |
| } else { |
| toThrow.setNextException(ClientUtil.parseServerException(e)); |
| } |
| } |
| } |
| } |
| } catch (Exception e) { |
| toThrow = ClientUtil.parseServerException(e); |
| } finally { |
| setMetricsInParentContext(); |
| if (toThrow != null) { |
| throw toThrow; |
| } |
| } |
| } |
| } |
| |
| private void setMetricsInParentContext() { |
| ReadMetricQueue parentCtxReadMetrics = parentStmtCtx.getReadMetricsQueue(); |
| for (ReadMetricQueue readMetrics : readMetricsList) { |
| parentCtxReadMetrics.combineReadMetrics(readMetrics); |
| } |
| OverAllQueryMetrics parentCtxQueryMetrics = parentStmtCtx.getOverallQueryMetrics(); |
| for (OverAllQueryMetrics metric : overAllQueryMetricsList) { |
| parentCtxQueryMetrics.combine(metric); |
| } |
| } |
| |
| @Override |
| public List<List<Scan>> getScans() { |
| if (scans == null) |
| return Collections.emptyList(); |
| else |
| return scans; |
| } |
| |
| @Override |
| public int size() { |
| return scans.size(); |
| } |
| |
| @Override |
| public void explain(List<String> planSteps) { |
| for (PeekingResultIterator iterator : iterators) { |
| iterator.explain(planSteps); |
| } |
| } |
| |
| @Override |
| public List<PeekingResultIterator> getIterators() throws SQLException { |
| return iterators; |
| } |
| |
| @Override |
| public void explain(List<String> planSteps, |
| ExplainPlanAttributesBuilder explainPlanAttributesBuilder) { |
| boolean moreThanOneIters = false; |
| ExplainPlanAttributesBuilder lhsPointer = null; |
| // For more than one iterators, explainPlanAttributes will create |
| // chain of objects as lhs and rhs query plans. |
| for (PeekingResultIterator iterator : iterators) { |
| if (moreThanOneIters) { |
| ExplainPlanAttributesBuilder rhsBuilder = |
| new ExplainPlanAttributesBuilder(); |
| iterator.explain(planSteps, rhsBuilder); |
| ExplainPlanAttributes rhsPlans = rhsBuilder.build(); |
| lhsPointer.setRhsJoinQueryExplainPlan(rhsPlans); |
| lhsPointer = rhsBuilder; |
| } else { |
| iterator.explain(planSteps, explainPlanAttributesBuilder); |
| lhsPointer = explainPlanAttributesBuilder; |
| } |
| moreThanOneIters = true; |
| } |
| } |
| } |