Minor Description
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:
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.
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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