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https://issues.apache.org/jira/browse/HIVE-22495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974994#comment-16974994
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Hive QA commented on HIVE-22495:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12985879/HIVE-22495.patch
{color:red}ERROR:{color} -1 due to build exiting with an error
Test results:
https://builds.apache.org/job/PreCommit-HIVE-Build/19436/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/19436/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-19436/
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Tests exited with: Exception: Patch URL
https://issues.apache.org/jira/secure/attachment/12985879/HIVE-22495.patch was
found in seen patch url's cache and a test was probably run already on it.
Aborting...
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12985879 - PreCommit-HIVE-Build
> Parquet count(*) read in all data
> ---------------------------------
>
> Key: HIVE-22495
> URL: https://issues.apache.org/jira/browse/HIVE-22495
> Project: Hive
> Issue Type: Bug
> Components: Reader
> Reporter: Jason Xu
> Assignee: Jason Xu
> Priority: Major
> Attachments: HIVE-22495.patch, HIVE-22495.patch
>
>
> Running a hive query on a Parquet table
> select count ( * ) from test_table
> The query read in all data (all columns) instead of just metadata.
> For comparison, hive 0.13 and Spark read in much less data with my test table.
>
> ||engine||HDFS data read||
> |Hive 2.3.4| 452.9 MB|
> |Hive 0.13| 22.5 KB|
> |Spark| 41.6 KB|
>
> Seems cause is that Parquet read support fall back to file schema if
> indexColumnsWanted is empty, logic still exist in master branch.
> Don't know why this empty list check was added, please suggest if there're
> any other impact.
>
>
>
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