HyukjinKwon commented on a change in pull request #26429: [SPARK-29777][SparkR]
SparkR::cleanClosure aggressively removes a function required by user function
URL: https://github.com/apache/spark/pull/26429#discussion_r346261239
##########
File path: R/pkg/R/utils.R
##########
@@ -546,8 +546,11 @@ processClosure <- function(node, oldEnv, defVars,
checkedFuncs, newEnv) {
ifelse(identical(func, obj), TRUE, FALSE)
})
if (sum(found) > 0) {
- # If function has been examined, ignore.
- break
+ # If function has been examined
+ if (identical(parent.env(environment(funcList[found][[1]])),
func.env)) {
Review comment:
Ah, okay. seems recursive function has never been properly supported. It
seems currently losing the nested function in its environment.
```R
df <- createDataFrame(list(list(n=2)))
ff <- function(n) { ifelse(n == 1, 1, n * ff(n-1)) }
collect(dapply(df, function(x) {
data.frame(a=ff(x$n))
}, structType("a double")))
```
If we actually call the nested function, it fails.
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