xuefuz commented on issue #8314: [FLINK-12365][table] Add stats related catalog 
APIs
URL: https://github.com/apache/flink/pull/8314#issuecomment-488133623
 
 
   I updated the PR with the following reworking:
   1. Modified CatalogColumnStatistics class to enclose statistical info of all 
columns for a table/partition.
   2. Added CatalogColumnStatisticsDataBase as a base class for column stats 
values that can be subclassed for different data types.
   3. Added two stats value types, boolean and long, as examples. More types 
will be added in followup JIRAs.
   4. Return "unknown" stats for GenericInMemoryCatalog when stats are not 
available for a table/partition.
   5. Modfied tests and test utils accordingly.

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