[
https://issues.apache.org/jira/browse/HIVE-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13574553#comment-13574553
]
Mark Grover commented on HIVE-3179:
-----------------------------------
Running TestHBaseCliDriver tests...
> HBase Handler doesn't handle NULLs properly
> -------------------------------------------
>
> Key: HIVE-3179
> URL: https://issues.apache.org/jira/browse/HIVE-3179
> Project: Hive
> Issue Type: Bug
> Components: HBase Handler
> Affects Versions: 0.9.0, 0.10.0
> Reporter: Lars Francke
> Priority: Critical
> Attachments: HIVE-3179.1.patch
>
>
> We found a quite severe issue in the HBase Handler which actually means that
> Hive potentially returns incorrect data if a column has NULL values in HBase
> (which means the cell doesn't even exist)
> In HBase Shell:
> {noformat}
> create 'hive_hbase_test', 'test'
> put 'hive_hbase_test', '1', 'test:c1', 'c1-1'
> put 'hive_hbase_test', '1', 'test:c2', 'c2-1'
> put 'hive_hbase_test', '1', 'test:c3', 'c3-1'
> put 'hive_hbase_test', '2', 'test:c1', 'c1-2'
> {noformat}
> In Hive:
> {noformat}
> DROP TABLE IF EXISTS hive_hbase_test;
> CREATE EXTERNAL TABLE hive_hbase_test (
> id int,
> c1 string,
> c2 string,
> c3 string
> )
> STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
> WITH SERDEPROPERTIES ("hbase.columns.mapping" =
> ":key#s,test:c1#s,test:c2#s,test:c3#s")
> TBLPROPERTIES("hbase.table.name" = "hive_hbase_test");
> hive> select * from hive_hbase_test;
> OK
> 1 c1-1 c2-1 c3-1
> 2 c1-2 NULL NULL
> hive> select c1 from hive_hbase_test;
> c1-1
> c1-2
> hive> select c1, c2 from hive_hbase_test;
> c1-1 c2-1
> c1-2 NULL
> {noformat}
> So far everything is correct but now:
> {noformat}
> hive> select c1, c2, c2 from hive_hbase_test;
> c1-1 c2-1 c2-1
> c1-2 NULL c2-1
> {noformat}
> Selecting c2 twice works the first time but the second time we
> actually get the value from the previous row.
> {noformat}
> hive> select c1, c3, c2, c2, c3, c3, c1 from hive_hbase_test;
> c1-1 c3-1 c2-1 c2-1 c3-1 c3-1 c1-1
> c1-2 NULL NULL c2-1 c3-1 c3-1 c1-2
> {noformat}
> We've narrowed this down to an early initialization of
> {{fieldsInited\[fieldID] = true}} in {{LazyHBaseRow#uncheckedGetField}} and
> we'll try to provide a patch which surely needs review.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
