Samuel Yuan created HIVE-3940:
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Summary: Track columns accessed in each table in a query
Key: HIVE-3940
URL: https://issues.apache.org/jira/browse/HIVE-3940
Project: Hive
Issue Type: Task
Components: Query Processor
Reporter: Samuel Yuan
Assignee: Samuel Yuan
Priority: Minor
Similar to partition access logs, we need to have columns access logs, so later
we can build tools/reports to inform users if there are wasted columns in a
table to be trimmed.
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