marcusianlevine opened a new pull request #4108: Bugfix: Check datatype of results before converting to DataFrame URL: https://github.com/apache/incubator-superset/pull/4108 The [merged hotfix](https://github.com/apache/incubator-superset/pull/2412) #2412 resolved an [issue with Presto/Hive columns](https://github.com/apache/incubator-superset/issues/2398) #2398 which are lists of dictionaries. However, this introduced issue #3934 with traditional RDB datasources like MS SQL Server, which only return lists of lists. Wrapping such results in an outer list causes pandas to interpret the list as a single column. This PR attempts to resolve that issue by introspecting the datatype of the first element in the return data. The type check may not be checking for exactly the right thing (first row vs. any of the columns in the first row?) but we likely need some sort of conditional to avoid wrapping a list of lists in an outer list
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