> BZip2Codec does not work with SequenceFile right now in 0.19. I consider that to be a bug.
The standard criteria is whether it is a regression. Did it work in a release prior to 0.19? If so, then it's a regression and should be fixed in 0.19. If not then it's a new feature, and should be added in 0.20.
However sometimes, as an exception, we permit fixes to all-new code, e.g., a new contrib module, that are not regressions, if they have zero chance of causing a regression anywhere else. This patch touches only files that were added in 0.19, and those files were themselves an independent addition (http://svn.apache.org/viewvc?view=rev&revision=680802), so I see no possibility for this creating any regressions in 0.19 and would not oppose treating it as such an exception.