Aihua Xu created HIVE-18887:
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Summary: Improve preserving column stats for alter table commands
Key: HIVE-18887
URL: https://issues.apache.org/jira/browse/HIVE-18887
Project: Hive
Issue Type: Improvement
Components: Metastore
Affects Versions: 3.0.0
Reporter: Aihua Xu
Assignee: Aihua Xu
We are trying to preserve column stats for certain alter table commands, while
seems that current generic approach which compare the old columns against the
new columns and update for all the columns may not be efficient . e.g., if we
just rename the table, we should be able to update the name itself. COL_STATS
table somehow contains DB_Name and Table_Name. If those tables don't have these
columns, certain commands don't even need to update these tables.
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