drill-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From sudheeshkatkam <...@git.apache.org>
Subject [GitHub] drill pull request: DRILL-3623: Use shorter query path for LIMIT 0...
Date Tue, 17 Nov 2015 00:26:43 GMT
Github user sudheeshkatkam commented on a diff in the pull request:

    https://github.com/apache/drill/pull/193#discussion_r45006594
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillDirectScanRel.java
---
    @@ -0,0 +1,111 @@
    +/**
    + * 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.planner.logical;
    +
    +import com.google.common.collect.Iterators;
    +import org.apache.calcite.plan.RelOptCluster;
    +import org.apache.calcite.plan.RelTraitSet;
    +import org.apache.calcite.rel.AbstractRelNode;
    +import org.apache.calcite.rel.RelWriter;
    +import org.apache.calcite.rel.type.RelDataType;
    +import org.apache.drill.common.logical.data.LogicalOperator;
    +import org.apache.drill.exec.physical.base.PhysicalOperator;
    +import org.apache.drill.exec.planner.physical.DrillScanPrel;
    +import org.apache.drill.exec.planner.physical.PhysicalPlanCreator;
    +import org.apache.drill.exec.planner.physical.PlannerSettings;
    +import org.apache.drill.exec.planner.physical.Prel;
    +import org.apache.drill.exec.planner.physical.PrelUtil;
    +import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
    +import org.apache.drill.exec.record.BatchSchema;
    +import org.apache.drill.exec.store.direct.DirectGroupScan;
    +
    +import java.io.IOException;
    +import java.util.Iterator;
    +
    +/**
    + * Logical and physical RelNode representing a {@link DirectGroupScan}. This is not backed
by a {@link DrillTable},
    + * unlike {@link DrillScanRel}.
    + */
    +public class DrillDirectScanRel extends AbstractRelNode implements DrillScanPrel, DrillRel
{
    --- End diff --
    
    With DrillDirectScanRel, the execution plan is: *Screen <-- Project <-- DrillDirectScanRel*.
In my experiments ([TPCDS queries](https://github.com/mapr/drill-test-framework/tree/master/framework/resources/Functional/tpcds/original/hive)),
the total time did not cross 0.6 s.
    
    With VALUES operator, there needs to be a LIMIT(0) operator on top. Then, the execution
plan is: *Screen <-- Project <-- SVR <-- Limit <-- Values*. In my experiments,
sometimes (seen twice) Project and SVR take ~0.5s to setup, and the query take 2s to complete,
but this is **not reproducible.**


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---

Mime
View raw message