Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7085#issuecomment-116723253
LGTM. I guess the problem in the old code was a precedence issue that was
causing the implicitly-concatenated string to be joined to each profile instead
of concatenating the joined profiles to the start of the log message:
```python
>>> print("hello" " world")
hello world
>>> print("hello " ",".join(["a", "b", "c"]))
ahello ,bhello ,c
```
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