jeffreythewang commented on issue #4740: Add extraction function support for Druid queries URL: https://github.com/apache/incubator-superset/pull/4740#issuecomment-385596164 We currently don't use extraction functions either. This may have already been answered, but I'm curious why you didn't use the pydruid [`DimensionSpec`](https://github.com/druid-io/pydruid/blob/master/pydruid/utils/dimensions.py#L8) builder?
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