paul-rogers commented on issue #1870: DRILL-7359: Add support for DICT type in RowSet Framework URL: https://github.com/apache/drill/pull/1870#issuecomment-561448583 On `ProjectionType`, if the `SchemaPath` is, say, `foo`, then the `ProjectionType` will be `SCALAR`. I can see that this name is misleading. Perhaps `SIMPLE` is better. We don't know that the column **is** scalar, we just know that it is consistent with a scalar. It could be a map, array or dict as well. But, if you do add a `SchemaPath` representation for `foo['bar']`, then, yes, that can only be a `DICT`, so we can introduce a `DICT` projection type.
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