Holger Brandl

What about ``` DataFrame.readCSV(File("foo.csv"), CSVFormat.DEFAULT.withNullString("MISSING")) ``` ? Technically a dedicated argument could be added, but I'm not sure if this would bloat the method signatures in the long run. A...

Why would we want to replace apache-commons-csv? What would be a better alternative? I've chosen apache-commons-csv initially here because I could not find any better alternatives. I see the point...

I share the argument. Technically it would be even easy to do so. However. as we are currently use `Array` to support NA, `DoubleCol` is not backed by a double-array,...

See https://github.com/holgerbrandl/krangl/blob/bd5aa75e482892186d163fcf1f089c474c019002/src/main/kotlin/krangl/Columns.kt#L98

What about GroupedDataFrame? Wouldn't we then rather need to mark the upstream interface `DataFrame` itself? I've tried but did not come up with a good argument against sealed. So this...

Let's keep it open until it is actually implemented.

Database type mappings are done in https://github.com/holgerbrandl/krangl/blob/master/src/main/kotlin/krangl/Builder.kt#L309 Not sure what 1111 is all about. Could you share some details, so that we could extend the mapper?

I know it's been a while. I've simplified the example to get rid of the differentiation. But then it seems to work fine. 

Please also see started test in referenced commit

That's such a great pointer. Thanks for sharing. :-) I wonder in particular if this would somehow allow to bundle R as a jar-dependency for kravis. I've tried to build...