Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21775#discussion_r204285853
--- Diff: docs/sql-programming-guide.md ---
@@ -1843,6 +1843,7 @@ working with timestamps in `pandas_udf`s to get the
best performance, see
## Upgrading From Spark SQL 2.3 to 2.4
+ - Since Spark 2.4, Spark will display hive table description column
`Last Access` value as `UNKNOWN` following the Hive system.
--- End diff --
This is applicable to both native and hive tables. How about changing it to
> Spark will display table description column `Last Access` value as
`UNKNOWN` when the value was `Jan 01 1970`.
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