mistercrunch opened a new pull request #4358: [druid] fix bug around handling NULLs URL: https://github.com/apache/incubator-superset/pull/4358 fillna would miss out on identifying STRING columns for Druid and replace None in string columns with a numeric `0`. This mixed type column would confuse pandas down the line on some operations like `df.pivot_table`. superseeds https://github.com/apache/incubator-superset/pull/4236 @xrmx ?
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