bowenli86 commented on issue #10380: [FLINK-14662]Distinguish unknown 
CatalogTableStatistics and zero
URL: https://github.com/apache/flink/pull/10380#issuecomment-561036955
 
 
   > My guess would be this is not the case with unknown table stats, but 
indeed have table stats that shows the row count is 0.
   > @zjuwangg please double check this.
   
   that comes down to how to define `unknown` table stats. From my perspective, 
value of the unknown table stats is the initial default value, which remains 
unchanged before running any `analyze` commands. E.g. if we just append rows or 
partitions to a table in Hive, `totalSize=0, numRows=0, rawDataSize=0` would 
remain unchanged.
   
   and have we checked how Hive behaves when having `totalSize=-1, numRows=-1, 
rawDataSize=-1`?

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