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https://issues.apache.org/jira/browse/HIVE-17562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16173783#comment-16173783
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Prasanth Jayachandran commented on HIVE-17562:
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The patch is applied against master by precommit and hence the compilation
error. This issue happens only in branch-2. In master, with ACID 2.0 ACID split
strategy is essentially a no-op. Whereas in branch-2, ACID split strategy now
treats base files without any stripes as uncovered deltas. The only breaking
test in branch-2 is testETLCompactedNoStripes which will fail the assertion
after the second insert query. testBICompactedNoStripes is added just for test
coverage.
> ACID 1.0 + ETL strategy should treat empty compacted files as uncovered deltas
> ------------------------------------------------------------------------------
>
> Key: HIVE-17562
> URL: https://issues.apache.org/jira/browse/HIVE-17562
> Project: Hive
> Issue Type: Bug
> Components: Transactions
> Affects Versions: 2.4.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Attachments: HIVE-17562.1.branch-2.patch
>
>
> In branch-2, with ACID 1.0, following sequence will result in incorrect
> results
> 1) Set split strategy to ETL
> 2) Insert some rows
> 3) Delete all rows
> 4) Alter table compact MAJOR
> 5) Insert some rows
> 6) Select * query will not return any rows that is written at last (step 5)
> The reason for that, compaction essentially voids the first insert in step 2.
> Now when ETL split strategy is chosen, there will not be any stripes in the
> base files. So no split gets generated and any subsequent deltas gets ignored.
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