cloud-fan commented on pull request #27066:
URL: https://github.com/apache/spark/pull/27066#issuecomment-632075377
I haven't looked at the patch yet, but looking at the proposed API
```
val result = data.withColumn("a", 'a.withFields(
("b", $"a.b".withFields(
("a", $"a.b.a".withFields(
("b", lit(5))))))))
```
This is a huge improvement to the original API, but I'm thinking if we can
do better. What if we make `withColumn` support nested fields? Then we can
further simplify the API:
```
val result = data.withColumn("a.b.a", lit(5))
```
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