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_r346103050
##########
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:
Actually, even with this fix, it can cause dead loop ...
```r
> a <- function(x) { ifelse(x == 1, a(x), 3) }
> SparkR:::cleanClosure(a)
Error: node stack overflow
```
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