[ 
https://issues.apache.org/jira/browse/HIVE-21818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16857631#comment-16857631
 ] 

Hive QA commented on HIVE-21818:
--------------------------------

| (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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 10m 
 1s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
7s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
47s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  4m 
12s{color} | {color:blue} ql in master has 2256 extant Findbugs warnings. 
{color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
1s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
31s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
10s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
10s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
52s{color} | {color:red} ql: The patch generated 5 new + 680 unchanged - 7 
fixed = 685 total (was 687) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  4m 
31s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
2s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
14s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 27m  3s{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 
3.16.43-2+deb8u5 (2017-09-19) x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/data/hiveptest/working/yetus_PreCommit-HIVE-Build-17451/dev-support/hive-personality.sh
 |
| git revision | master / e7f2fccd |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-17451/yetus/diff-checkstyle-ql.txt
 |
| modules | C: ql U: ql |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-17451/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> CBO: Copying TableRelOptHiveTable has metastore traffic
> -------------------------------------------------------
>
>                 Key: HIVE-21818
>                 URL: https://issues.apache.org/jira/browse/HIVE-21818
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>            Reporter: Gopal V
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-21818.01.patch, HIVE-21818.02.patch, 
> HIVE-21818.03.patch, HIVE-21818.04.patch, HIVE-21818.04.patch, 
> HIVE-21818.05.patch, HIVE-21818.05.patch, HIVE-21818.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> While the optimizer is running, whenever it makes a copy of the TableScan to 
> perform potential rewrites, there is Hive metastore traffic from inside CBO 
> optimizer.
> {code}
>   public RelOptHiveTable(RelOptSchema calciteSchema, RelDataTypeFactory 
> typeFactory, List<String> qualifiedTblName,
>       RelDataType rowType, Table hiveTblMetadata, List<ColumnInfo> 
> hiveNonPartitionCols,
>       List<ColumnInfo> hivePartitionCols, List<VirtualColumn> 
> hiveVirtualCols, HiveConf hconf,
>       Map<String, PrunedPartitionList> partitionCache, Map<String, 
> ColumnStatsList> colStatsCache,
>       AtomicInteger noColsMissingStats) { ....
>     Pair<List<ImmutableBitSet>, List<ImmutableBitSet>> constraintKeys = 
> generateKeys();
>     this.keys = constraintKeys.left;
>     this.nonNullablekeys = constraintKeys.right;
>     this.referentialConstraints = generateReferentialConstraints();
> }
> {code}
> This is triggered from the rules as the partition pruner
> {code}
>   protected void perform(RelOptRuleCall call, Filter filter,
>       HiveTableScan tScan) {
>     // Original table
>     RelOptHiveTable hiveTable = (RelOptHiveTable) tScan.getTable();
>     // Copy original table scan and table
>     HiveTableScan tScanCopy = tScan.copyIncludingTable(tScan.getRowType());
>     RelOptHiveTable hiveTableCopy = (RelOptHiveTable) tScanCopy.getTable();
> ...
>     if (StringUtils.equals(hiveTableCopy.getPartitionListKey(), 
> hiveTable.getPartitionListKey())) {
>       // Nothing changed, we do not need to produce a new expression
>       return;
>     }
> {code}



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