srowen commented on issue #25720: [SPARK-28930][SQL] Last Access Time value shall display 'UNKNOWN' in all clients URL: https://github.com/apache/spark/pull/25720#issuecomment-531795492 OK I see that we already intend to display "UNKNOWN" to match Hive in some cases. This does not change? Are you saying that Spark will use -1 and Hive will use 0 in the metastore for unknown values? then why change Spark's value? You can just treat <= 0 as unknown?
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