[GitHub] [flink] zjuwangg opened a new pull request #10394: [FLINK-14663]Distinguish catalogColumnStats' unknown value and real values

[GitBox <gi...@apache.org>]

zjuwangg opened a new pull request #10394: [FLINK-14663]Distinguish catalogColumnStats' unknown  value and real values
URL: https://github.com/apache/flink/pull/10394
 
 
   ## What is the purpose of the change
   
   *When converting from hive stats to Flink's column stats, we didn't check whether some columns stats is really set or just an initial value. This PR we aim to change the CatalogColumnStatisticsDataBase and its subclass's stats from primitive types to corresponding boxed-type.*
   
   
   ## Brief change log
   
     - *[68e7752](https://github.com/apache/flink/commit/68e77528300eadcbeaa62372d676b01e268c39a8) Distinguish catalogColumnStats' unknown  value and real values*
   
   
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as *HiveCatalogHiveMetadataTest#testAlterTableColumnStatistics* and so on.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not applicable)
   

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