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Set LastReaderCommitId on new versions #1429
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…ses parts 5 and 6 of cmu-db#1420.
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* Set LastReaderCommitId on insert, update, and delete versions. Addresses parts 5 and 6 of cmu-db#1420.
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Addresses points 5 and 6 of #1420. MVTO should set the Last Reader timestamp to be the version creator's timestamp.[1] This was previously not done, and could trigger an assertion failure in Debug mode.
[1]A. Silberschatz, H. Korth and S. Sudarshan, Database System Concepts, 6th ed. New York: McGraw Hill, 2011, p. 690.