zhangstar333 opened a new pull request, #20890:
URL: https://github.com/apache/doris/pull/20890
* in order to solve agg of sum/count is not compatibility during the
upgrade process.
* in PR #20370 have changed the serialize type and serialize column of
sum/count
* before is ColumnVector, now sum/count change to use
ColumnFixedLengthObject
* so during the upgrade process, will be not compatible if exist Old BE and
Newer BE
## Proposed changes
Issue Number: close #xxx
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