linliu-code opened a new pull request, #14105:
URL: https://github.com/apache/hudi/pull/14105
### Describe the issue this Pull Request addresses
Column `valueType` is added to ColumnStats record schema. This causes
backward compatibility issue since old ColumnStats records do not have this
column in their schema. After upgrade, when MDT tries to access this column,
these old records would throw exception saying
`org.apache.avro.AvroRuntimeException: Not a valid schema field: valueType`.
### Summary and Changelog
The solution is to check if `valueType` column exists in current schema. If
not, we return `V1EmptyMetadata` object.
### Impact
Fix one compatibility issue after upgrade to version 9.
### Risk Level
Low.
### 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 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)
- [ ] Enough context is provided in the sections above
- [ ] Adequate tests were added if applicable
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