linliu-code opened a new pull request, #12991:
URL: https://github.com/apache/hudi/pull/12991
### Change Logs
Previously when the configuration "hoodie.record.merge.mode" is null (by
default), we will not add precombine field to the required schema since we
assume it is commit time ordering.
But actually we should treat the case that "hoodie.record.merge.mode" is
null as an unknown, and then try to add the precombine field to the required
schema as much as possible. Otherwise, for event_time_ordering, it could cause
ordering value comparison failure.
### Impact
Fix a bug.
### Risk level (write none, low medium or high below)
Medium.
### Documentation Update
_Describe any necessary documentation update if there is any new feature,
config, or user-facing change. If not, put "none"._
- _The config description must be updated if new configs are added or the
default value of the configs are changed_
- _Any new feature or user-facing change requires updating the Hudi website.
Please create a Jira ticket, attach the
ticket number here and follow the
[instruction](https://hudi.apache.org/contribute/developer-setup#website) to
make
changes to the website._
### Contributor's checklist
- [ ] Read through [contributor's
guide](https://hudi.apache.org/contribute/how-to-contribute)
- [ ] Change Logs and Impact were stated clearly
- [ ] Adequate tests were added if applicable
- [ ] CI passed
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