Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/5365#issuecomment-89830292
I looked into the Jenkins log, since the Github auth issue prevented it
from posting results besides the unit tests. I was surprised that it did not
report binary incompatibility. When I look at the bytecode before and after, it
does clearly seem to change the signature:
```
public
setIfMissing(Ljava/lang/String;Ljava/lang/String;)Lorg/apache/spark/SparkConf;
```
```
public
setIfMissing(Ljava/lang/String;Lscala/Function0;)Lorg/apache/spark/SparkConf;
```
So, I think we can't do this. An overload defeats the purpose, right?
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