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https://issues.apache.org/jira/browse/HIVE-29816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HIVE-29816 started by Raghav Aggarwal.
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> Iceberg: MERGE INTO with WHEN MATCHED THEN DELETE incorrectly duplicates rows
> under Copy-On-Write delete mode
> -------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-29816
> URL: https://issues.apache.org/jira/browse/HIVE-29816
> Project: Hive
> Issue Type: Bug
> Reporter: Raghav Aggarwal
> Assignee: Raghav Aggarwal
> Priority: Major
> Attachments: hive.png, spark.png
>
>
> When executing a MERGE INTO statement with a WHEN MATCHED THEN DELETE clause
> on an Iceberg table configured with *write.delete.mode=copy-on-write* ({*}and
> default write.merge.mode=merge-on-read{*}), the target rows matching the
> condition are incorrectly duplicated instead of being deleted.
> Attaching sql to repro and spark vs hive comparison screenshot
> Simple steps to repro:
> {code:java}
> CREATE TABLE ice_cow_merge_delete_only (id INT, data STRING)
> STORED BY ICEBERG
> TBLPROPERTIES ('format-version'='3', 'write.delete.mode'='copy-on-write');
> INSERT INTO ice_cow_merge_delete_only VALUES (1, 'apple'), (2, 'banana'), (3,
> 'cherry');
> MERGE INTO ice_cow_merge_delete_only t
> USING (SELECT 2 as id, 'banana' as data) s
> ON t.id = s.id
> WHEN MATCHED THEN DELETE;
> SELECT * FROM ice_cow_merge_delete_only;
> {code}
> Wrong Output:
> {code:java}
> +-------------------------------+---------------------------------+
> | ice_cow_merge_delete_only.id | ice_cow_merge_delete_only.data |
> +-------------------------------+---------------------------------+
> | 1 | apple |
> | 2 | banana |
> | 3 | cherry |
> | 2 | banana |
> +-------------------------------+---------------------------------+ {code}
> Expected Output:
> {code:java}
> 1 apple
> 3 cherry {code}
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