paul-rogers commented on issue #1813: DRILL-7306: Disable schema-only batch for 
new scan framework
URL: https://github.com/apache/drill/pull/1813#issuecomment-506999568
 
 
   When running the full tests, the following failed in `java-exec`:
   
   ```
   [ERROR] Errors: 
   [ERROR]   
TestDynamicUDFSupport.testReRegisterTheSameJarWithDifferentContent:600->BaseTestQuery.testRunAndReturn:340
 ยป Rpc
   ```
   
   When running this unit test in Eclipse, two tests failed: `testDropFunction` 
and `testSuccessfulRegistrationAfterSeveralRetryAttempts`. Then, 
`testConcurrentRemoteRegistryUpdateWithDuplicates` hung forever.
   
   I believe these tests (and one other that I can't recall) seem to fail about 
50% of the time on my builds.
   
   The workaround seems to be to rebuild all of Drill. That is, the rough 
pattern seems to be that this test will run once after a clean build, but will 
fail if run a second time or after a code change. Not sure if this is the exact 
pattern; something like this happens.
   
   The result is that it is hard to tell if my code broke something or if the 
tests are just flaky. I wonder, is there something we can do to stabilize these 
tests? All other tests run fine if I rerun them a second time on the same build 
or after I make a small code change.
   
   Anyway, after doing a full rebuild and retest, this commit does pass all 
unit tests.

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