bolkedebruin commented on issue #3604: Mapbox Visualizatuion error cause by "is not JSON serializable" URL: https://github.com/apache/incubator-superset/issues/3604#issuecomment-353866674 Ok I found the issue. The dimensions of the LimitSpec part of the query are populated with metrics or self.metrics. This is a druidmetric instead of a column name. I think the logic (run_query) is wrong here and it should use dimensions instead and not metrics. I?m not entirely sure and need some help from @Fokko or @mistercrunch. Then the PR is quite simple. Offending lines: 1. https://github.com/apache/incubator-superset/blob/master/superset/connectors/druid/models.py#L1139 2. https://github.com/apache/incubator-superset/blob/master/superset/connectors/druid/models.py#L1188
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