Github user rerngvit commented on the issue:
https://github.com/apache/spark/pull/14264
@sun-rui
> could you share the background that this PR can fix the issue.
As stated in https://issues.apache.org/jira/browse/SPARK-11976, Spark core
is already supporting column name ".". However, it does not work without the
backticks (`). The missing part to make it work is a corresponding logic in the
Analyzer layer.
> I see that https://issues.apache.org/jira/browse/SPARK-11976 is still
open.
I do not fully understand your question. Could you please elaborate a bit
more? **This PR** is actually SPARK-11976.
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