Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18142
> BTW, I believe there's no particular standard for backticks themselves
since different DBMS uses different backtick implementations.
You are right, but SQL standard does define how to quote identifiers, by
using `"xyz"`. Databases usually support one more syntax to quote identifiers,
e.g. backticks, square brackets, etc.
So for this case, I think it's obvious that users want to quote the
function name, and we have a bug.
> One explicit problem here is, we claim Hive compatibility in Spark.
Do we? Sometimes we follow hive behaviors, but we never guarantee that IIRC.
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