Naveen Gangam created HIVE-18328:
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Summary: Improve schematool validator to report duplicate rows for
column statistics
Key: HIVE-18328
URL: https://issues.apache.org/jira/browse/HIVE-18328
Project: Hive
Issue Type: Improvement
Components: Hive
Affects Versions: 2.1.1
Reporter: Naveen Gangam
Assignee: Naveen Gangam
By design, in the {{TAB_COL_STATS}} table of the HMS schema, there should be
ONE AND ONLY ONE row, representing its statistics, for each column defined in
hive. A combination of DB_NAME, TABLE_NAME and COLUMN_NAME constitute a primary
key/unique row.
Each time the statistics are computed for a column, this row is updated.
However, if somehow via BDR/replication process, we end up with multiple rows
in this table for a given column, HMS server to recompute the statistics there
after.
So it would be good to detect this data anamoly via the schema validation tool.
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