Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/14118
I support this PR. But just to make sure, I'd like to bring a reference.
It seems at least `na.strings` option in `read.csv` in R does as proposed
here,
```r
bt <- "A,B,C,D
10,20,NaN
30,,40
40,30,20
,NA,20"
b<- read.csv(text=bt,check.names = FALSE, na.strings=c("NA","NaN", " "))
b
```
prints
```
A B C D
1 10 20 NA NA
2 30 NA 40 NA
3 40 30 20 NA
4 NA NA 20 NA
```
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