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From hnfgns <...@git.apache.org>
Subject [GitHub] drill pull request: DRILL-4132 Ability to submit simple type of ph...
Date Thu, 28 Apr 2016 19:55:42 GMT
Github user hnfgns commented on a diff in the pull request:

    https://github.com/apache/drill/pull/368#discussion_r61492206
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/work/user/PlanSplitter.java
---
    @@ -0,0 +1,142 @@
    +/**
    + * 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.work.user;
    +
    +import java.util.List;
    +
    +import org.apache.drill.exec.ops.QueryContext;
    +import org.apache.drill.exec.physical.PhysicalPlan;
    +import org.apache.drill.exec.physical.base.PhysicalOperator;
    +import org.apache.drill.exec.planner.fragment.Fragment;
    +import org.apache.drill.exec.planner.fragment.MakeFragmentsVisitor;
    +import org.apache.drill.exec.planner.fragment.SimpleParallelizer;
    +import org.apache.drill.exec.planner.fragment.contrib.SimpleParallelizerMultiPlans;
    +import org.apache.drill.exec.planner.sql.DrillSqlWorker;
    +import org.apache.drill.exec.proto.BitControl.PlanFragment;
    +import org.apache.drill.exec.proto.UserBitShared.DrillPBError;
    +import org.apache.drill.exec.proto.UserBitShared.QueryId;
    +import org.apache.drill.exec.proto.UserBitShared.QueryResult.QueryState;
    +import org.apache.drill.exec.proto.UserProtos.GetQueryPlanFragments;
    +import org.apache.drill.exec.proto.UserProtos.QueryPlanFragments;
    +import org.apache.drill.exec.rpc.user.UserServer.UserClientConnection;
    +import org.apache.drill.exec.server.DrillbitContext;
    +import org.apache.drill.exec.util.MemoryAllocationUtilities;
    +import org.apache.drill.exec.util.Pointer;
    +import org.apache.drill.exec.util.Utilities;
    +import org.apache.drill.exec.work.QueryWorkUnit;
    +
    +import com.google.common.collect.Lists;
    +
    +/**
    + * Helper class to return PlanFragments based on the query plan
    + * or based on split query plan
    + *
    + */
    +public class PlanSplitter {
    +  static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(PlanSplitter.class);
    +
    +  private static PlanSplitter s_instance = new PlanSplitter();
    +
    +  private PlanSplitter() {
    +
    +  }
    +
    +  public static PlanSplitter getInstance() {
    +    return s_instance;
    --- End diff --
    
    This seems a very cheap object used once per query. Why to make it singleton? We should
create it in the stack/heap as we need.


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