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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3623) Hive query hangs with limit 0 clause
Date Fri, 09 Oct 2015 13:30:27 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14950383#comment-14950383
] 

ASF GitHub Bot commented on DRILL-3623:
---------------------------------------

Github user jacques-n commented on a diff in the pull request:

    https://github.com/apache/drill/pull/193#discussion_r41629465
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/NonDeferredSchemaTableLimit0Visitor.java
---
    @@ -0,0 +1,126 @@
    +/**
    + * 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
    + * <p/>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p/>
    + * 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.sql.handlers;
    +
    +import com.google.common.collect.Lists;
    +import org.apache.calcite.rel.RelNode;
    +import org.apache.calcite.rel.RelShuttleImpl;
    +import org.apache.calcite.rel.core.TableScan;
    +import org.apache.calcite.rel.type.RelDataType;
    +import org.apache.calcite.sql.type.SqlTypeFactoryImpl;
    +import org.apache.calcite.sql.type.SqlTypeName;
    +import org.apache.drill.common.exceptions.ExecutionSetupException;
    +import org.apache.drill.common.expression.SchemaPath;
    +import org.apache.drill.common.types.TypeProtos;
    +import org.apache.drill.exec.exception.SchemaChangeException;
    +import org.apache.drill.exec.expr.TypeHelper;
    +import org.apache.drill.exec.ops.OperatorContext;
    +import org.apache.drill.exec.physical.impl.OutputMutator;
    +import org.apache.drill.exec.planner.logical.DrillConstExecutor;
    +import org.apache.drill.exec.planner.logical.DrillScanRel;
    +import org.apache.drill.exec.planner.logical.DrillTable;
    +import org.apache.drill.exec.planner.types.DrillRelDataTypeSystem;
    +import org.apache.drill.exec.record.MaterializedField;
    +import org.apache.drill.exec.store.AbstractRecordReader;
    +import org.apache.drill.exec.store.RecordReader;
    +
    +import java.util.List;
    +import java.util.Map;
    +
    +/**
    + *
    + */
    +public class NonDeferredSchemaTableLimit0Visitor extends RelShuttleImpl {
    +//  private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(NonDeferredSchemaTableLimit0Visitor.class);
    +
    +  private RecordReader reader;
    +
    +  public static RecordReader getReader(RelNode node) {
    +    final NonDeferredSchemaTableLimit0Visitor visitor = new NonDeferredSchemaTableLimit0Visitor();
    +    node.accept(visitor);
    +    return visitor.getReader();
    +  }
    +
    +  private NonDeferredSchemaTableLimit0Visitor() {
    +  }
    +
    +  RecordReader getReader() {
    +    return reader;
    +  }
    +
    +  @Override
    +  public RelNode visit(TableScan scan) {
    +    if (scan instanceof DrillScanRel) {
    +      final DrillTable table = ((DrillScanRel) scan).getDrillTable();
    +
    +      System.out.println("here?");
    --- End diff --
    
    yes?


> Hive query hangs with limit 0 clause
> ------------------------------------
>
>                 Key: DRILL-3623
>                 URL: https://issues.apache.org/jira/browse/DRILL-3623
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Storage - Hive
>    Affects Versions: 1.1.0
>         Environment: MapR cluster
>            Reporter: Andries Engelbrecht
>             Fix For: Future
>
>
> Running a select * from hive.table limit 0 does not return (hangs).
> Select * from hive.table limit 1 works fine
> Hive table is about 6GB with 330 files with parquet using snappy compression.
> Data types are int, bigint, string and double.
> Querying directory with parquet files through the DFS plugin works fine
> select * from dfs.root.`/user/hive/warehouse/database/table` limit 0;



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