[GitHub] [iotdb] mzp0514 commented on a change in pull request #3162: [IOTDB-1143] Continuous query

[GitBox <gi...@apache.org>]

mzp0514 commented on a change in pull request #3162:
URL: https://github.com/apache/iotdb/pull/3162#discussion_r656322435



##########
File path: server/src/main/java/org/apache/iotdb/db/cq/ContinuousQuery.java
##########
@@ -0,0 +1,276 @@
+/*
+ * 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.cq;
+
+import org.apache.iotdb.db.exception.StorageEngineException;
+import org.apache.iotdb.db.exception.metadata.IllegalPathException;
+import org.apache.iotdb.db.exception.metadata.MetadataException;
+import org.apache.iotdb.db.exception.query.QueryProcessException;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.apache.iotdb.db.qp.Planner;
+import org.apache.iotdb.db.qp.executor.PlanExecutor;
+import org.apache.iotdb.db.qp.logical.crud.GroupByClauseComponent;
+import org.apache.iotdb.db.qp.logical.crud.QueryOperator;
+import org.apache.iotdb.db.qp.logical.crud.SelectComponent;
+import org.apache.iotdb.db.qp.physical.crud.GroupByTimePlan;
+import org.apache.iotdb.db.qp.physical.crud.InsertTabletPlan;
+import org.apache.iotdb.db.qp.physical.sys.CreateContinuousQueryPlan;
+import org.apache.iotdb.db.query.context.QueryContext;
+import org.apache.iotdb.db.query.control.QueryResourceManager;
+import org.apache.iotdb.db.utils.TypeInferenceUtils;
+import org.apache.iotdb.tsfile.exception.filter.QueryFilterOptimizationException;
+import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
+import org.apache.iotdb.tsfile.read.common.Field;
+import org.apache.iotdb.tsfile.read.common.Path;
+import org.apache.iotdb.tsfile.read.common.RowRecord;
+import org.apache.iotdb.tsfile.read.query.dataset.QueryDataSet;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class ContinuousQuery implements Runnable {
+
+  private static final Logger logger = LoggerFactory.getLogger(ContinuousQuery.class);
+
+  private final PlanExecutor planExecutor;
+  private final CreateContinuousQueryPlan plan;
+  private final Planner planner;
+
+  public ContinuousQuery(CreateContinuousQueryPlan plan) throws QueryProcessException {
+    this.plan = plan;
+    this.planExecutor = new PlanExecutor();
+    this.planner = new Planner();
+  }
+
+  @Override
+  public void run() {
+
+    try {
+
+      GroupByTimePlan queryPlan = getQueryPlan();
+
+      if (queryPlan.getDeduplicatedPaths().isEmpty()) {
+        logger.error(plan.getContinuousQueryName() + ": deduplicated paths empty");
+        return;
+      }
+
+      QueryDataSet result = doQuery(queryPlan);
+
+      if (result == null) {
+        logger.error(plan.getContinuousQueryName() + ": query result empty");
+        return;
+      }
+
+      doInsert(result, queryPlan);
+
+    } catch (Exception e) {
+      logger.error(plan.getContinuousQueryName() + ": run error", e);
+    }
+  }
+
+  private GroupByTimePlan getQueryPlan() throws QueryProcessException {
+
+    QueryOperator queryOperator = plan.getQueryOperator();
+
+    SelectComponent selectComponentCopy = new SelectComponent(queryOperator.getSelectComponent());
+
+    GroupByTimePlan queryPlan = planner.operatorToPhysicalPlan(queryOperator, 1024);
+
+    queryOperator.setSelectComponent(selectComponentCopy);
+
+    long timestamp = System.currentTimeMillis();
+    queryPlan.setStartTime(timestamp - plan.getForInterval());
+    queryPlan.setEndTime(timestamp);
+
+    return queryPlan;
+  }
+
+  private QueryDataSet doQuery(GroupByTimePlan queryPlan)
+      throws StorageEngineException, QueryFilterOptimizationException, MetadataException,
+          IOException, InterruptedException, QueryProcessException {
+    long queryId =
+        QueryResourceManager.getInstance()
+            .assignQueryId(true, 1024, queryPlan.getDeduplicatedPaths().size());
+
+    QueryDataSet result;
+    result = planExecutor.processQuery(queryPlan, new QueryContext(queryId));
+    QueryResourceManager.getInstance().endQuery(queryId);
+    return result;
+  }
+
+  private void doInsert(QueryDataSet result, GroupByTimePlan queryPlan)
+      throws QueryProcessException, IOException, IllegalPathException {
+
+    int columnSize = result.getDataTypes().size();
+    TSDataType dataType =
+        TypeInferenceUtils.getAggrDataType(
+            queryPlan.getAggregations().get(0), queryPlan.getDataTypes().get(0));
+
+    InsertTabletPlan[] insertTabletPlans = getInsertTabletPlans(columnSize, result, dataType);
+
+    int fetchSize =
+        (int)
+            Math.min(
+                10,

Review comment:
       if empty query, rowNum will be 0 < batchSize




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