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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