Hans Zeller created TRAFODION-2723:
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Summary: Add check to NATable cache for snapshot info
Key: TRAFODION-2723
URL: https://issues.apache.org/jira/browse/TRAFODION-2723
Project: Apache Trafodion
Issue Type: Sub-task
Components: sql-cmp
Affects Versions: 2.2-incubating
Environment: any, using snapshot scans
Reporter: Hans Zeller
Assignee: Hans Zeller
Fix For: 2.2-incubating
TRAFODION-2716 added code to read snapshot info conditionally. This means that
most NATable cache entries will not have this information. Now, if a user turns
on snapshot scan after accessing some tables, the cache entries will prevent
snapshot scans from happening, or they may create unnecessary snapshots.
Like it is done for other CQDs that influence NATable cache entries, we need to
invalidate the cache if the TRAF_TABLE_SNAPSHOT_SCAN has gone from NONE to some
value other than NONE. There is no need to check in the other direction, extra
snapshot scan info won't hurt.
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