kevinjmh commented on issue #3120: [CARBONDATA-3286] MV datamap doesn't take effect when query SQL has coalesce with all projections and no filter condition URL: https://github.com/apache/carbondata/pull/3120#issuecomment-490732671 we may block `coalesce` when creating MV, because this will affect incremental build of MV. According to the usage by now, we should keep MV in a simple and flexible way, so that mv can fit more query. Further, MV should provide a guideline
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