Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7197#issuecomment-119017492
Some experiments with property-based checks here:
https://github.com/JoshRosen/spark/commit/2595ec25ed4d8d3e4172eb5e2e9f13b4f876cfb4
Here's an problem that it found with `toLowerCase`:
```scala
scala> val s = "á»"
s: String = á»
scala> s.toLowerCase
res0: String = á»
scala> UTF8String.fromString(s).toLowerCase
res1: org.apache.spark.unsafe.types.UTF8String = á»
```
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