hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17634) Use properties from HiveConf about "fetchColStats" and "fetchPartStats" in RelOptHiveTable#updateColStats
Date Thu, 28 Sep 2017 17:56:02 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16184551#comment-16184551
] 

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

Hi [~kellyzly]. I think {{hive.stats.fetch.column.stats}} & {{hive.stats.fetch.partition.stats}}
are only for physical planning. Since logical planning (RelOptHiveTable::updateColStats) rely
heavily on column statistics we have it always on. [~ashutoshc] [~jcamachorodriguez]  can
you guys confirm this?

> 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. 



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

Mime
View raw message