cshuo opened a new pull request, #14309:
URL: https://github.com/apache/hudi/pull/14309

   ### Describe the issue this Pull Request addresses
   
   Fix issue https://github.com/apache/hudi/issues/14308.
   
   ### Summary and Changelog
   
   Currently, after create a hudi table in Flink catalog, and insert some 
records, users can not select metadata columns directly, like 
_hoodie_commit_time, we can leverage [flink metadata 
columns](https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/sql/create/#columns)
 to support reading internal hudi metadata columns.
   
   ### Impact
   
   Users can now query metadata columns directly in flink query.
   
   ### 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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