[fix] Enforce the QueryResult.df to be a pandas.DataFrame (Phase II) #8948
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SUMMARY
Related to #8935 this PR cleans up other places in the code where the
df
variable was eitherNone
or apandas.DataFrame
object. Given that now bothQueryResult
andpydruid
guarantee exporting of apandas.DataFrame
(which could be empty) the downstream logic is now simplified.TEST PLAN
CI.
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to: @mistercrunch @michellethomas @villebro @willbarrett