[ 
https://issues.apache.org/jira/browse/HIVE-15653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837412#comment-15837412
 ] 

Hive QA commented on HIVE-15653:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12849211/HIVE-15653.2.patch

{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 27 failed/errored test(s), 10983 tests 
executed
*Failed tests:*
{noformat}
TestDerbyConnector - did not produce a TEST-*.xml file (likely timed out) 
(batchId=235)
TestSparkCliDriver - did not produce a TEST-*.xml file (likely timed out) 
(batchId=120)
        
[groupby4_noskew.q,groupby3_map_skew.q,join_cond_pushdown_2.q,union19.q,union24.q,union_remove_5.q,groupby7_noskew_multi_single_reducer.q,vectorization_1.q,index_auto_self_join.q,auto_smb_mapjoin_14.q,script_env_var2.q,pcr.q,auto_join_filters.q,join0.q,join37.q]
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[alter_file_format] 
(batchId=53)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[alter_skewed_table] 
(batchId=33)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[alter_table_not_sorted] 
(batchId=58)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[columnStatsUpdateForStatsOptimizer_2]
 (batchId=27)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[create_alter_list_bucketing_table1]
 (batchId=24)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[create_like] (batchId=49)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[describe_comment_nonascii]
 (batchId=13)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[show_tblproperties] 
(batchId=76)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[stats_invalidation] 
(batchId=69)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[unset_table_view_property]
 (batchId=47)
org.apache.hadoop.hive.cli.TestEncryptedHDFSCliDriver.testCliDriver[encryption_join_with_different_encryption_keys]
 (batchId=159)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[offset_limit_ppd_optimizer]
 (batchId=151)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[orc_predicate_pushdown]
 (batchId=139)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[schema_evol_orc_nonvec_table]
 (batchId=140)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[schema_evol_orc_vec_table]
 (batchId=146)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[schema_evol_text_nonvec_table]
 (batchId=141)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[schema_evol_text_vec_part]
 (batchId=149)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[schema_evol_text_vec_table]
 (batchId=147)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[schema_evol_text_vecrow_table]
 (batchId=140)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[vector_if_expr]
 (batchId=140)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[vector_varchar_simple]
 (batchId=153)
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver[explainuser_3] 
(batchId=93)
org.apache.hadoop.hive.cli.TestNegativeCliDriver.testCliDriver[unset_table_property]
 (batchId=86)
org.apache.hive.hcatalog.pig.TestHCatLoaderComplexSchema.testSyntheticComplexSchema[0]
 (batchId=173)
org.apache.hive.hcatalog.pig.TestTextFileHCatStorer.testWriteDate2 (batchId=173)
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/3167/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/3167/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-3167/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 27 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12849211 - PreCommit-HIVE-Build

> Some ALTER TABLE commands drop table stats
> ------------------------------------------
>
>                 Key: HIVE-15653
>                 URL: https://issues.apache.org/jira/browse/HIVE-15653
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>    Affects Versions: 1.1.0
>            Reporter: Alexander Behm
>            Assignee: Chaoyu Tang
>            Priority: Critical
>         Attachments: HIVE-15653.1.patch, HIVE-15653.2.patch, HIVE-15653.patch
>
>
> Some ALTER TABLE commands drop the table stats. That may make sense for some 
> ALTER TABLE operations, but certainly not for others. Personally, I I think 
> ALTER TABLE should only change what was requested by the user without any 
> side effects that may be unclear to users. In particular, collecting stats 
> can be an expensive operation so it's rather inconvenient for users if they 
> get wiped accidentally.
> Repro:
> {code}
> create table t (i int);
> insert into t values(1);
> analyze table t compute statistics;
> alter table t set tblproperties('test'='test');
> hive> describe formatted t;
> OK
> # col_name                    data_type               comment             
>                
> i                     int                                         
>                
> # Detailed Table Information           
> Database:             default                  
> Owner:                abehm                    
> CreateTime:           Tue Jan 17 18:13:34 PST 2017     
> LastAccessTime:       UNKNOWN                  
> Protect Mode:         None                     
> Retention:            0                        
> Location:             hdfs://localhost:20500/test-warehouse/t  
> Table Type:           MANAGED_TABLE            
> Table Parameters:              
>       COLUMN_STATS_ACCURATE   false               
>       last_modified_by        abehm               
>       last_modified_time      1484705748          
>       numFiles                1                   
>       numRows                 -1                  
>       rawDataSize             -1                  
>       test                    test                
>       totalSize               2                   
>       transient_lastDdlTime   1484705748          
>                
> # Storage Information          
> SerDe Library:        org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe      
>  
> InputFormat:          org.apache.hadoop.mapred.TextInputFormat         
> OutputFormat:         
> org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat       
> Compressed:           No                       
> Num Buckets:          -1                       
> Bucket Columns:       []                       
> Sort Columns:         []                       
> Storage Desc Params:           
>       serialization.format    1                   
> Time taken: 0.169 seconds, Fetched: 34 row(s)
> {code}
> The same behavior can be observed with several other ALTER TABLE commands.



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