Why are missing values not ignored by default?

Internals & Design
,
106

in polars:

df.select(pl.corr(col1, col2))

vs in Julia you have to write your own

function missing_cor(a,b)
    mask = (!).(ismissing.(a) .|| ismissing.(b))
    cor(a[mask], b[mask])
end

combine(df, [:col1, :col2] => missing_cor)
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