Improve hooks run in Driver
---------------------------
Key: HIVE-2779
URL: https://issues.apache.org/jira/browse/HIVE-2779
Project: Hive
Issue Type: Improvement
Reporter: Kevin Wilfong
Assignee: Kevin Wilfong
There are some small improvements that can be made to the hooks which are run
in the Driver:
1) The code to get hooks has been clearly just been copy+pasted for each of
Pre/Post/OnFailure/SemanticAnalyzer hooks. This code should be consolidated
into a single method.
2) There is a lot more information available to SemanticAnalyzer hooks which
ran after semantic analysis than to those that run before, such as inputs and
outputs. We should make some of this information available to those hooks,
preferably through HiveSemanticAnalyzerHookContext, so that existing hooks
aren't broken.
3) Currently, possibly unintentionally, hooks are initialized and run in the
order they appear in the comma separated list that is the value of the
configuration variable. This is a useful property, we should add comments
indicating this is desired and add a unit test to enforce it.
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