Sunitha Kambhampati created SPARK-27761:
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Summary: Make UDF nondeterministic by default(?)
Key: SPARK-27761
URL: https://issues.apache.org/jira/browse/SPARK-27761
Project: Spark
Issue Type: Brainstorming
Components: SQL
Affects Versions: 3.0.0
Reporter: Sunitha Kambhampati
Opening this issue as a followup from a discussion/question on this PR for an
optimization involving deterministic udf:
https://github.com/apache/spark/pull/24593#pullrequestreview-237361795
"We even should discuss whether all UDFs must be deterministic or
non-deterministic by default."
Basically today in Spark 2.4, Scala UDFs are marked deterministic by default
and it is implicit. To mark a udf as non deterministic, they need to call this
method asNondeterministic().
The concern's expressed are that users are not aware of this property and its
implications.
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