The following statement appears in the Scala API example at
https://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.sql.DataFrame
people.filter("age" > 30).
I tried this example and it gave a compilation error. I think this needs to
be changed to people.filter(people("age") > 30)
Also, it would be good to add some examples for the new equality operator
for columns (e.g. (people("age") === 30) ). The programming guide does not
have an example for this in the DataFrame Operations section and it was not
very obvious that we need to be using a different equality operator for
columns.
thanks
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