Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14367
cc @hvanhovell @rxin , this is actually a breaking change, as previously we
support `df.select("a $% z. xy")`, which will find the column `a $% z` and
get its inner field ` xy`.
Personally I think we should not support it and make the Dataset API more
consistent with SQL API.
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