Github user shivaram commented on a diff in the pull request: https://github.com/apache/spark/pull/13984#discussion_r69359023 --- Diff: R/pkg/R/SQLContext.R --- @@ -744,6 +746,9 @@ read.df.default <- function(path = NULL, source = NULL, schema = NULL, ...) { if (is.null(source)) { source <- getDefaultSqlSource() } + if (source == "csv" && is.null(options[["nullValue"]])) { + options[["nullValue"]] <- "NA" --- End diff -- instead of hard coding this can we add a `na.strings` argument to `read.df` ? thats more similar to read.table in R https://stat.ethz.ch/R-manual/R-devel/library/utils/html/read.table.html
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