[IMPALA-4688] audit qgen workarounds

• Type: Task
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: Impala 2.8.0
• Component/s: Infrastructure
• Labels: query_generator_development
• Target Version: Product Backlog
• Assignee: Unassigned
• Reporter: Michael Brown
• Created: 16/Dec/16 22:48
• Updated: 28/Sep/17 19:50

Description

There are workarounds in several layers of the random query generator. The workarounds exist due to open bugs, resolved/fixed bugs, resolved/wontfix bugs, and more. We should spend time auditing these, removing ones we believe are no longer a problem, and document the ones we kept around.

For example:

        elif isinstance(test_val, float) \
            and (isinf(test_val) or isnan(test_val)):
          # In some cases, Impala gives NaNs and Infs instead of NULLs
          comparison_result.exception = KnownError(
              'https://issues.cloudera.org/browse/IMPALA-724')