DataFrame.dropNulls

DataFrame dropNulls(string[] subset = null, NullHow how = NullHow.ANY)

Drops rows by a null criterion over the selected columns. how = ANY (default) drops a row when any selected column is null; how = ALL drops a row only when every selected column is null. subset = null selects every column; an empty (non-null) subset is an explicit no-op that keeps every row (the vacuous-truth rule). Row order and all columns - selected or not - are preserved.

Parameters

`subset`	the column names the criterion applies to, or `null` for all columns
`how`	the drop criterion

Returns

the frame with the dropped rows removed.

Throws

DataFrameException for an unknown or duplicate subset

name.