Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/22939
Will make another PR after this gets merged to allow the cases below:
```r
df <- sql("SELECT named_struct('name', 'Bob') as people")
df <- mutate(df, people_json = to_json(df$people))
head(select(df, from_json(df$people_json,
schema_of_json(head(df)$people_json))))
```
```
from_json(people_json)
1 Bob
```
```r
df <- sql("SELECT named_struct('name', 'Bob') as people")
df <- mutate(df, people_json = to_csv(df$people))
head(select(df, from_csv(df$people_json,
schema_of_csv(head(df)$people_json))))
```
```
from_csv(people_json)
1 Bob
```
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