[GitHub] [druid] ritik02 opened a new pull request #9445: dd postMergeQueryDecoration() in MaterializedViewQueryToolChest for TopNQuery and decorateObjectMapper() in MaterializedViewQueryToolChest for GroupByQuery

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ritik02 opened a new pull request #9445: dd postMergeQueryDecoration() in MaterializedViewQueryToolChest for TopNQuery and decorateObjectMapper() in MaterializedViewQueryToolChest for GroupByQuery
URL: https://github.com/apache/druid/pull/9445
 
 
   
   ### 1) MaterializedViewQueryToolChest did not implement postMergeQueryDecoration() for TopN Queries hence returning wrong results 
   2) MaterializedViewQueryToolChest did not implement decorateObjectMapper() for GroupBy Queries hence ArrayBasedResults whereas expected is MapBasedResults.
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   This PR has:
   - [x] been self-reviewed.
   - [x] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
   - [x] added unit tests or modified existing tests to cover new code paths.
   - [x] been tested in a test Druid cluster.
   
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   <hr>
   
   ##### Key changed/added classes in this PR
    * `MaterializedViewQueryQueryToolChest`
    * `MaterializedViewQueryQueryToolChest`
   
   

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