leventov opened a new issue #6977: Design of MaterializedViewQuery URL: https://github.com/apache/incubator-druid/issues/6977 Currently, #5556 implements it as `MaterializedViewQuery` and `MaterializedViewQueryQueryToolChest`, i. e. in the same type framework as `Query` and `QueryToolChest`. However, `MaterializedViewQuery` and `MaterializedViewQueryQueryToolChest` are shallow and pass-through classes. `MaterializedViewQueryQueryToolChest` couldn't sensibly return something from `getResultTypeReference()`, so I wonder why it didn't throw NPE in `DirectDruidClient` before, but I hit this problem in my change #6898. There should probably be an abstraction like "query modifier" and other parts of the infrastructure should recognize it. cc @zhangxinyu1 @jihoonson
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