Github user wangmiao1981 commented on a diff in the pull request:
https://github.com/apache/spark/pull/17640#discussion_r113972686
--- Diff: R/pkg/R/serialize.R ---
@@ -83,6 +83,7 @@ writeObject <- function(con, object, writeType = TRUE) {
Date = writeDate(con, object),
POSIXlt = writeTime(con, object),
POSIXct = writeTime(con, object),
+ bigint = writeDouble(con, object),
--- End diff --
When using createDataFrame, R uses `serialize` to send data to the backend.
When taking an action, say, `collect`, scala side logic refers to the schema
field and calls the `readTypedObjects` where the newly added read logic kicks
in. When it returns back to R side, the newly added write logic kicks in and R
side can interpret it due to the R side read logic. It seems that the `write`
logic in R side is not called, because we don't have specific type `bigint` in
R. Right?
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