jacobtolar commented on issue #9192: Add ReplaceMissingValueExtractionFn URL: https://github.com/apache/druid/pull/9192#issuecomment-577343548 Not sure what I was doing with `lookup` (I think maybe I used `{null: "0"}`, which is invalid json) when I played around with this earlier, but it does what I want: ``` { "type":"lookup", "dimension":"some_dimension", "outputName":"some_dimension", "retainMissingValue":true, "lookup":{"type": "map", "map":{"":"0"}, "isOneToOne":false} } ``` So, I don't think this change is really necessary; closing
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