[
https://issues.apache.org/jira/browse/HIVE-12750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15090615#comment-15090615
]
Gopal V commented on HIVE-12750:
--------------------------------
The patch adds minimal performance impact (~8%), but after getting a simpler
test-case, I've isolated some code which does not populate the isNull array and
is triggering this particular issue.
A better approach to fixing this would be to maintain isNull correctly for a
rare combination of FIL -> MJ -> FIL.
As a top level analysis, fixing HIVE-12824 or HIVE-12809 would end up fixing
the symptoms again without fixing the root-cause.
I'll file a few more possible bugs which came up during a step through of the
code.
> Vectorization logic not maintaining noNulls flag and isNull array properly
> causing wrong query results
> ------------------------------------------------------------------------------------------------------
>
> Key: HIVE-12750
> URL: https://issues.apache.org/jira/browse/HIVE-12750
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-12750.1.patch, HIVE-12750.2.patch,
> HIVE-12750.3.patch, HIVE-12750.4.patch, HIVE-12750.5.patch,
> HIVE-12750.6.patch, HIVE-12750.8.patch
>
>
> A very large query produced wrong results due to not maintaining noNulls flag
> and isNull array properly. No Q file since input files too large.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
