IMPALA-7681 introduced support for the ADLS Gen2 service / ABFS client. As mentioned in the code review for that (https://gerrit.cloudera.org/#/c/11630/) a couple of tests were failing because they use a partition name that ends with a period. If the tests are modified to end with anything other than a period, they work just fine.
HADOOP-15860, that's sounding like it's just a known limitation of the blob storage that shares infrastructure with ADLS Gen2 that won't be changing any time soon. I propose we modify the tests to just use a slightly different partition name.