HIVE-29554: Refactor MTableColumnStatistics and MPartitionColumnStatistics to avoid code duplication

[thomasrebele]

HIVE-29554

What changes were proposed in this pull request?

Extract a common superclass MColumnStatistics from MPartitionColumnStatistics and MColumnStatistics and combine some methods that use the latter two.

Why are the changes needed?

There is a lot of code duplication around column statistics, which increases the risk of diverging code and partially applied fixes.

Does this PR introduce any user-facing change?

No

How was this patch tested?

1. I've run Hive from the master branch (13f3208), created a table with some values, and executed analyze table tab1 compute statistics for columns;. I verified the statistics with describe formatted tab1 a;.
2. I stopped Hive, and run Hive with the changes of the PR. I checked that the statistics are shown correctly. I inserted more values into the table and executed the ANALYZE TABLE ... command. I verified the statistics.
3. I stopped Hive, and run Hive from the master branch again. I verified the statistics. I inserted more values into the table and executed the ANALYZE TABLE ... command. I verified the statistics.

I started and run the DESCRIBE FORMATTED, ANALYZE TABLE, DESCRIBE FORMATTED sequence for

• a metastore server with the changes from the PR, and
• a hiveserver and beeline from the master branch

and vice versa, i.e.,

• a metastore server from the master branch, and
• a hiveserver and beeline with the changes from the PR

All commands worked as expected.

[sonarqubecloud]

Quality Gate passed

Issues
14 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.5% Duplication on New Code

See analysis details on SonarQube Cloud