Missing values default to a `StringDataFrameColumn`

dotnet / corefxlab

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Missing values default to a `StringDataFrameColumn` #2982

Closed pgovind closed 4 years ago

pgovind commented 4 years ago

Fix for https://github.com/dotnet/corefxlab/issues/2979

Technically, one could specify the column types in LoadCsv, but I think this behavior of defaulting to a StringDataFrameColumn makes the API behave better.