Github user ilooner commented on the issue:
https://github.com/apache/drill/pull/984
After squashing the commits and rebasing I noticed the windows functional
tests were failing. The issue was caused by replacing the '/' constant in
FileUtils (now renamed to DrillFileUtils) in **ClassTransformer** and
**FunctionInitializer** with File.separator. This broke the build because
File.separator is '\' on windows and in the context of **ClassTransformer** and
**FunctionInitializer** the separator is used to look things up in the
classpath. Looking things up in the classpath requires '/' on both windows and
linux, hence I added back the '/' constant to DrillFileUtils along with a
comment explaining its purpose and used it in **ClassTransformer** and
**FunctionInitializer**. *Note:* this was a minor fix that impacted only a few
lines.
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