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Yes, but we need to design API that is general enough (otherwise the number of things that users would need to learn would be too large). And that is a challenge here. For time being you can use https://gitlab.com/aplavin/FlexiJoins.jl (or just create a temporary column to match against).
Excellent Bogumil. I didt'n know about this package. I am glad Julia is getting noticed. Packages are increasing. Again, thank you for the consideration of this feature. I'd say DataFrames is one hook for many Data analysts who are trying Julia, and every improvement you and the contributors make are really welcome.
df1=DataFrame(N=["JOHN", "PETER"] ,value=[1,2])
df2=DataFrame(n=["john","peter"],value2=[3,4])
want something like:
leftjoin( df1 , df2, on=[ (:N=>lowercase) => :n])
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