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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 Thu, 29 Oct 2015 02:50:27 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979701#comment-14979701

ASF GitHub Bot commented on DRILL-3623:

Github user jacques-n commented on the pull request:

    I'm sorry to say that I'm -1 on this change
    It seems to be adding a planning rewrite rule where there should be a simple fix execution
bug. Let's just fix the execution bug. 
    Limit 0 should complete its execution the moment it receives a schema (as part of fast
schema). It doesn't need to receive any records. You just described a situation where it is
waiting for records from a blocking operator. That shouldn't be the case. If there is some
other real benefit to this change after that execution bug is fixed, let's revisit in that
    If you think I'm misunderstanding your description of the execution behavior or the dynamics
involved, please help me to better understand. 

> 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
>            Assignee: Jinfeng Ni
>             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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