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https://issues.apache.org/jira/browse/HIVE-26788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sourabh Badhya updated HIVE-26788:
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Description: Currently, statistics are always updated for major compaction
and never updated for minor compaction since minor compaction performs little
updates on the statistics (such as number of files in table/partition & total
size of the table/partition). It is better to utilize NOSCAN operation for
both these compaction since NOSCAN operations performs faster update of
statistics and updates the relevant fields such as number of files & total
sizes of the table/partitions if stats autogather is enabled. If autostats
gather is disabled then go for full update of statistics. (was: Currently,
statistics are not updated for minor compaction since minor compaction performs
little updates on the statistics (such as number of files in table/partition &
total size of the table/partition). It is better to utilize NOSCAN operation
for minor compaction since NOSCAN operations performs faster update of
statistics and updates the relevant fields such as number of files & total
sizes of the table/partitions.)
> Update stats of table/partition using noscan operation when stats autogather
> is enabled
> ---------------------------------------------------------------------------------------
>
> Key: HIVE-26788
> URL: https://issues.apache.org/jira/browse/HIVE-26788
> Project: Hive
> Issue Type: Improvement
> Reporter: Sourabh Badhya
> Assignee: Sourabh Badhya
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> Currently, statistics are always updated for major compaction and never
> updated for minor compaction since minor compaction performs little updates
> on the statistics (such as number of files in table/partition & total size of
> the table/partition). It is better to utilize NOSCAN operation for both
> these compaction since NOSCAN operations performs faster update of statistics
> and updates the relevant fields such as number of files & total sizes of the
> table/partitions if stats autogather is enabled. If autostats gather is
> disabled then go for full update of statistics.
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