navina opened a new pull request, #9851:
URL: https://github.com/apache/pinot/pull/9851
Related to #9771
After a schema evolves (eg. new column added), the column is not treated as
an upsert column by the partition upsert manager because it is not part of
`PartialUpsertHandler#column2Mergers`. This PR attempts to fix this by
iterating through all columns in the record and applying a default merge
strategy on all columns, except primary key and comparison column.
Note: This PR can handle schema evolution of adding new columns without
restarting the server, as long as there are no changes to the upsert config.
Any change made to the `upsertConfig: {}` section in the table config of a
partial upsert enabled table will require a server restart to correctly reload
all segments and the metadata.
Labels: `bugfix`
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