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https://issues.apache.org/jira/browse/HIVE-16957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16733088#comment-16733088
 ] 

Hive QA commented on HIVE-16957:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {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 
13s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  6m 
40s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
53s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 6s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  3m 
42s{color} | {color:blue} ql in master has 2312 extant Findbugs warnings. 
{color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
38s{color} | {color:blue} itests/hive-unit in master has 2 extant Findbugs 
warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
26s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
26s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  2m 
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
54s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
54s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
43s{color} | {color:red} ql: The patch generated 6 new + 563 unchanged - 7 
fixed = 569 total (was 570) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  3m 
50s{color} | {color:red} ql generated 1 new + 2310 unchanged - 2 fixed = 2311 
total (was 2312) {color} |
| {color:red}-1{color} | {color:red} javadoc {color} | {color:red}  0m 
53s{color} | {color:red} ql generated 2 new + 98 unchanged - 2 fixed = 100 
total (was 100) {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
13s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 30m 44s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:ql |
|  |  
org.apache.hadoop.hive.ql.parse.ColumnStatsSemanticAnalyzer.genPartitionClause(Table,
 Map) makes inefficient use of keySet iterator instead of entrySet iterator  At 
ColumnStatsSemanticAnalyzer.java:of keySet iterator instead of entrySet 
iterator  At ColumnStatsSemanticAnalyzer.java:[line 160] |
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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_PreCommit-HIVE-Build-15479/dev-support/hive-personality.sh
 |
| git revision | master / 691c4cb |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-15479/yetus/diff-checkstyle-ql.txt
 |
| findbugs | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-15479/yetus/new-findbugs-ql.html
 |
| javadoc | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-15479/yetus/diff-javadoc-javadoc-ql.txt
 |
| modules | C: ql itests/hcatalog-unit itests/hive-unit U: . |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-15479/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Support CTAS for auto gather column stats
> -----------------------------------------
>
>                 Key: HIVE-16957
>                 URL: https://issues.apache.org/jira/browse/HIVE-16957
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Pengcheng Xiong
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>         Attachments: HIVE-16957.01.patch, HIVE-16957.02.patch, 
> HIVE-16957.03.patch, HIVE-16957.04.patch, HIVE-16957.05.patch, 
> HIVE-16957.06.patch, HIVE-16957.07.patch, HIVE-16957.07.patch, 
> HIVE-16957.08.patch, HIVE-16957.08.patch, HIVE-16957.09.patch, 
> HIVE-16957.09.patch, HIVE-16957.patch
>
>
> The idea is to rely as much as possible on the logic in 
> ColumnStatsSemanticAnalyzer as other operations do. In particular, they 
> create a 'analyze table t compute statistics for columns', use 
> ColumnStatsSemanticAnalyzer to parse it, and connect resulting plan to 
> existing INSERT/INSERT OVERWRITE statement. The challenge for CTAS or CREATE 
> MATERIALIZED VIEW is that the table object does not exist yet, hence we 
> cannot rely fully on ColumnStatsSemanticAnalyzer.
> Thus, we use same process, but ColumnStatsSemanticAnalyzer produces a 
> statement for column stats collection that uses a table values clause instead 
> of the original table reference:
> {code}
> select compute_stats(col1), compute_stats(col2), compute_stats(col3)
> from table(values(cast(null as int), cast(null as int), cast(null as 
> string))) as t(col1, col2, col3);
> {code}



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