wangbo opened a new issue #3061: [Spark Load] Doris Support Using Hive Table to Build Global Dict URL: https://github.com/apache/incubator-doris/issues/3061 **Why Global Dict** Doris has already support using ```roaring bitmap``` to store bitmap for query ```Precise Count Distinct Measure```. But ```roaring bitmap``` just support ```int type```. If we want to support ```non-int type column ``` 's ```Precise Count Distinct```, We need a Global Dict to keep a map from ```non-int value``` and ```int value```. ```Global Dict``` is used to keep the map. **Implementation details** see pr #2940
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