jeffreythewang commented on issue #4740: Add extraction function support for Druid queries URL: https://github.com/apache/incubator-superset/pull/4740#issuecomment-386061964 My bad, I thought you were attaching `extractionFn`s to `DimensionSpec`s as well like in [this](http://druid.io/docs/latest/querying/dimensionspecs.html#extraction-functions) way, but it seems like you are building the `Filter`s from `DimensionSpec`s that already have `extractionFn`s defined. I assume you have users (or someone else) define their own `extractionFn`s in the datasource configuration?
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