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https://issues.apache.org/jira/browse/HIVE-17495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16302258#comment-16302258
 ] 

Hive QA commented on HIVE-17495:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Findbugs executables are not available. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  1m 
21s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  5m 
33s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
24s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
39s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
24s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
20s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
29s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
28s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
28s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
22s{color} | {color:red} standalone-metastore: The patch generated 10 new + 
1131 unchanged - 31 fixed = 1141 total (was 1162) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 1s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
27s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
12s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 16m 29s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Optional Tests |  asflicense  javac  javadoc  findbugs  checkstyle  compile  |
| uname | Linux hiveptest-server-upstream 3.16.0-4-amd64 #1 SMP Debian 
3.16.36-1+deb8u1 (2016-09-03) x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /data/hiveptest/working/yetus/dev-support/hive-personality.sh |
| git revision | master / 035eca3 |
| Default Java | 1.8.0_111 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-8372/yetus/diff-checkstyle-standalone-metastore.txt
 |
| modules | C: standalone-metastore itests/hcatalog-unit itests/hive-unit U: . |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-8372/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> 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
>         Attachments: HIVE-17495.1.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
>
>
> 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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