rumbin commented on issue #3043: SQL Lab error in exporting .csv when query has duplicately named columns URL: https://github.com/apache/incubator-superset/issues/3043#issuecomment-341022004 In this case I'd start digging in https://github.com/apache/incubator-superset/blob/abfa03474cae49f66caf0d77533bf9b8e040145e/superset/views/core.py#L2181 This is where the query gets executed once more, just for exportring to csv. Judging from your observation that the column renaming is fine withiun the Result tab in SQLLab, my guess is that the column renaming was forgotten to be implemented for the CSV export. When a Cache backend is configured, the exported results are the very same as the ones shown in SQLLab, thus the columns are correctly renamed. I haven't tried so far finding the code where the deduplication of the column names takes place, though...
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