Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/10943#issuecomment-175906396
`select` is the API that supposed to take `column path`, but something like
`withColumn`, `drop`, etc. is supposed to take `column name`. So what I suggest
is: change `resolve` to `resolvePath` and add a new method `resolvedName` which
abstract the columm name resolution logic from
[`withColumn`](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala#L1178-L1180),
then we can use `resolveName` in `drop` and other APIs that need a `column
name` instead of `column path`.
FYI, the PR that fixed a similar problem for `withColumn`:
https://github.com/apache/spark/pull/10500
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