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Date: Thu, 28 Sep 2017 21:14:06 +0000 (UTC)
From: "Vineet Garg (JIRA)" <jira@apache.org>
To: issues@hive.apache.org
Message-ID: <JIRA.13105706.1506590510000.230341.1506633246116@Atlassian.JIRA>
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Subject: [jira] [Commented] (HIVE-17634) Use properties from HiveConf about
 "fetchColStats" and "fetchPartStats" in RelOptHiveTable#updateColStats
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archived-at: Thu, 28 Sep 2017 21:14:11 -0000


    [ https://issues.apache.org/jira/browse/HIVE-17634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16184886#comment-16184886 ] 

Vineet Garg commented on HIVE-17634:
------------------------------------

I confirmed this with [~ashutoshc] that logical planning indeed uses 'true' on purpose to always use column stats. So it should not be changed to make it use {{hive.stats.fetch.column.stats}} & {{hive.stats.fetch.partition.stats}} confs.

> Use properties from HiveConf about "fetchColStats" and "fetchPartStats" in RelOptHiveTable#updateColStats
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-17634
>                 URL: https://issues.apache.org/jira/browse/HIVE-17634
>             Project: Hive
>          Issue Type: Bug
>            Reporter: liyunzhang_intel
>            Assignee: liyunzhang_intel
>         Attachments: HIVE-17634.patch
>
>
> in [RelOptHiveTable#updateColStats|https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/RelOptHiveTable.java#L309], we set {{fetchColStats}},{{fetchPartStats}} as true when call {{StatsUtils.collectStatistics}}
> {code}
>    if (!hiveTblMetadata.isPartitioned()) {
>         // 2.1 Handle the case for unpartitioned table.
>         try {
>           Statistics stats = StatsUtils.collectStatistics(hiveConf, null,
>               hiveTblMetadata, hiveNonPartitionCols, nonPartColNamesThatRqrStats,
>               colStatsCached, nonPartColNamesThatRqrStats, true, true);
>       ...
> {code}
> This will cause querying columns statistic from metastore even we set  {{hive.stats.fetch.column.stats}} and {{hive.stats.fetch.partition.stats}} as false in HiveConf.  If we these two properties as false, we can not any column statistics from metastore.  Suggest to set the properties from HiveConf. 


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