bolkedebruin commented on issue #3604: Mapbox Visualizatuion error cause by "is not JSON serializable" URL: https://github.com/apache/incubator-superset/issues/3604#issuecomment-352280582 Digging abit deeper, unfortunately adding a "default()" method will not work. The json module has a bit of a peculiar default way of doing serialization, which does not allow serialization methods being added to classes. However, here it seems that a DruidMetric is somewhere to being forgotten to be .json_obj() as it is done in `run_query` for metrics. Somehow one (or more) slips trough.
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