[jira] [Commented] (HIVE-21460) ACID: Load data followed by a select * query results in incorrect results

["Vaibhav Gumashta (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-21460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795827#comment-16795827 ] 

Vaibhav Gumashta commented on HIVE-21460:
-----------------------------------------

cc [~gopalv]

> ACID: Load data followed by a select * query results in incorrect results
> -------------------------------------------------------------------------
>
>                 Key: HIVE-21460
>                 URL: https://issues.apache.org/jira/browse/HIVE-21460
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 4.0.0, 3.1.1
>            Reporter: Vaibhav Gumashta
>            Assignee: Vaibhav Gumashta
>            Priority: Blocker
>         Attachments: HIVE-21460.1.patch
>
>
> This affects current master as well. Created an orc file such that it spans multiple stripes and ran a simple select *, and got incorrect row counts (when comparing with select count(*). The problem seems to be that after split generation and creating min/max rowId for each row (note that since the loaded file is not written by Hive ACID, it does not have ROW__ID in the file; but the ROW__ID is applied on read by discovering min/max bounds which are used for calculating ROW__ID.rowId for each row of a split), Hive is only reading the last split.



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