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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:

    --- 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.**

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