Github user yijieshen commented on the pull request:
https://github.com/apache/spark/pull/7451#issuecomment-122048286
Log family semantic comparision:
Expression | Hive | Spark SQL
-------|-------| ----------------
ln(0.0) | NULL | -Infinity
ln(-1) | NULL | NaN
Since we disable udf7 to enable log base between (0.0, 1], we do not have
log related comparsion with Hive. So, what about log's other behaviour?
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