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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15397) metadata-only queries may return incorrect results with empty tables
Date Fri, 09 Dec 2016 02:31:58 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15734067#comment-15734067
] 

Hive QA commented on HIVE-15397:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12842449/HIVE-15397.patch

{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 16 failed/errored test(s), 10773 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[limit_partition_metadataonly] (batchId=57)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[partInit] (batchId=73)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[partition_date2] (batchId=16)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[partition_timestamp2] (batchId=29)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[sample2] (batchId=5)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[sample4] (batchId=15)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[sample6] (batchId=61)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[sample7] (batchId=60)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[sample9] (batchId=38)
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver[transform_ppr2] (batchId=134)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[metadataonly1] (batchId=149)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[stats_based_fetch_decision]
(batchId=150)
org.apache.hadoop.hive.cli.TestMiniSparkOnYarnCliDriver.org.apache.hadoop.hive.cli.TestMiniSparkOnYarnCliDriver
(batchId=159)
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver[explainanalyze_2] (batchId=92)
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver[explainanalyze_4] (batchId=92)
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver[limit_partition_metadataonly]
(batchId=119)
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/2507/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/2507/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-2507/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 16 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12842449 - PreCommit-HIVE-Build

> metadata-only queries may return incorrect results with empty tables
> --------------------------------------------------------------------
>
>                 Key: HIVE-15397
>                 URL: https://issues.apache.org/jira/browse/HIVE-15397
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-15397.patch
>
>
> Queries like select 1=1 from t group by 1=1 may return rows, based on OneNullRowInputFormat,
even if the source table is empty. For now, add some basic detection of empty tables and turn
this off by default (since we can't know whether a table is empty or not based on there being
some files, without reading them).



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