danny0405 commented on PR #8579:
URL: https://github.com/apache/hudi/pull/8579#issuecomment-1523173556
> If preCombine is invoked with the same key when an old data {price: 11.00,
_ts:999} is received together with a new data {price: null, _ts: 1001}, the old
data's column value might overwrite the existing newer data {price: 10.0, _ts:
1000}.
This is expected right ? We always ignore the nulls while merging, shouldn't
the `#combineAndGetUpdateValue` follow the same convention?
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