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https://issues.apache.org/jira/browse/IGNITE-8550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488750#comment-16488750
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Stanislav Lukyanov commented on IGNITE-8550:
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To clarify: the issue only causes a false warning message, functionality is not
broken.
> CacheAbstractJdbcStore expects merge to always return 1 but MySQL may also
> return 2 or 0
> ----------------------------------------------------------------------------------------
>
> Key: IGNITE-8550
> URL: https://issues.apache.org/jira/browse/IGNITE-8550
> Project: Ignite
> Issue Type: Bug
> Components: sql
> Reporter: Stanislav Lukyanov
> Assignee: Vladimir Ozerov
> Priority: Major
> Fix For: 2.6
>
>
> CacheAbstractJdbcStore.write attempts to execute a merge update if it is
> available, and expects the merge to always return 1 (as the number of updated
> entries is always 1).
> However, MySQL's `INSERT ... ON DUPLICATE KEY UPDATE`
> (https://dev.mysql.com/doc/refman/8.0/en/insert-on-duplicate.html) may return
> 0 or 2, depending on what was updated:
> {quote}With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if
> the row is inserted as a new row, 2 if an existing row is updated, and 0 if
> an existing row is set to its current values.{quote}
> Because of that, CacheAbstractJdbcStore may report a false warning.
> Need to consider either removing the warning or special-case the MySQL
> dialect to allow to return values other than 1.
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