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From julianhyde <...@git.apache.org>
Subject [GitHub] drill pull request: DRILL-3623: Use shorter query path for LIMIT 0...
Date Tue, 17 Nov 2015 01:34:52 GMT
Github user julianhyde commented on a diff in the pull request:

    https://github.com/apache/drill/pull/193#discussion_r45012029
  
    --- 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 --
    
    Yeah, I think DrillDirectScanRel is a wrong turn for this functionality, because you can't
see that it is empty and reason about it. A DirectGroupScan is a runtime thing, so shouldn't
be floating around at planning time.
    
    I notice that DrillValuesRel does not extend Values. If it did, it would get all of the
rules in PruneEmptyRules for free - pruning away Filter, Project etc. on top of it.


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