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https://issues.apache.org/jira/browse/HIVE-17495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16329128#comment-16329128
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Vaibhav Gumashta commented on HIVE-17495:
-----------------------------------------
Committed. Thanks [~daijy].
> CachedStore: prewarm improvement (avoid multiple sql calls to read partition
> column stats), refactoring and caching some aggregate stats
> ----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-17495
> URL: https://issues.apache.org/jira/browse/HIVE-17495
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Reporter: Vaibhav Gumashta
> Assignee: Vaibhav Gumashta
> Priority: Major
> Fix For: 3.0.0
>
> Attachments: HIVE-17495.1.patch, HIVE-17495.10.patch,
> HIVE-17495.10.patch, HIVE-17495.2.patch, HIVE-17495.3.patch,
> HIVE-17495.4.patch, HIVE-17495.5.patch, HIVE-17495.6.patch,
> HIVE-17495.7.patch, HIVE-17495.8.patch, HIVE-17495.9.patch
>
>
> Only when CachedStore is enabled, we would like to make the following
> optimizations:
> 1. During CachedStore prewarm, use one sql call to retrieve column stats
> objects for a db and store it in the cache.
> 2. Cache some aggregate stats (e.g. aggregate stats for all partitions,
> which seems to be commonly used) for query compilation speedup.
> 3. There was a bug in {{MetaStoreUtils.aggrPartitionStats}}, which would use
> an iterator.next w/o checking with iterator.hasNext. This patch refactors
> some code to fix that.
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