[jira] [Created] (HIVE-15530) Optimize the column stats update logic in table alteration

["Yibing Shi (JIRA)" <ji...@apache.org>]

Yibing Shi created HIVE-15530:
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             Summary: Optimize the column stats update logic in table alteration
                 Key: HIVE-15530
                 URL: https://issues.apache.org/jira/browse/HIVE-15530
             Project: Hive
          Issue Type: Bug
          Components: Hive
            Reporter: Yibing Shi


Currently when a table is altered, if any of below conditions is false, HMS would try to update column statistics for the table:

# database name is changed
# table name is changed
# old columns and new columns are not the same

As a result, when a column is added to a table, Hive also tries to update column statistics, which is not necessary. We can loose the last condition by checking whether all existing columns are changed or not. If not, we don't have to update stats info.



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