Strange behavior with dataframes in julia 1.6

General Usage
1

I’m seeing something strange in dataframes.

In version 1.5.3, i am using the leftjoin function in dataframes and it works OK

df = DataFrame(A = 1:4, B = ["M", "F", "F", "M"])
df2 = DataFrame(A = 1:4, C = ["M", "F", "F", "M"])
julia> leftjoin(df,df2,on = :A)

This works OK

but from julia 1.6 rc-1, I’m getting the following error when trying to use leftjoin

df = DataFrame(A = 1:4, B = ["M", "F", "F", "M"])
df2 = DataFrame(A = 1:4, C = ["M", "F", "F", "M"])
julia> leftjoin(df,df2,on=:A)
ERROR: UndefVarError: leftjoin not defined

is this a function of julia 1.6 or some issue with a version of dataframes?

2

Does DataFrames.leftjoin work?

3

No, same error message.

And it isn’t required in 1.5.3 so I’d hate to have to rewrite my code to make it compatible with 1.6

4

I just tried your code and it worked fine

df = DataFrame(A = 1:4, B = ["M", "F", "F", "M"])
4×2 DataFrame
 Row │ A      B
     │ Int64  String
─────┼───────────────
   1 │     1  M
   2 │     2  F
   3 │     3  F
   4 │     4  M

julia> df2 = DataFrame(A = 1:4, C = ["M", "F", "F", "M"])
4×2 DataFrame
 Row │ A      C
     │ Int64  String
─────┼───────────────
   1 │     1  M
   2 │     2  F
   3 │     3  F
   4 │     4  M

julia> leftjoin(df,df2,on=:A)
4×3 DataFrame
 Row │ A      B       C
     │ Int64  String  String?
─────┼────────────────────────
   1 │     1  M       M
   2 │     2  F       F
   3 │     3  F       F
   4 │     4  M       M

What version of Dataframes are you using? I am on v0.22.5 with 1.6.0-rc1

5

I just used the version that installed within a fresh 1.6 rc-1 installation. That shows v0.20.2.

I did a update package, but that’s the version after update.

6

So I tried to update package, but it wouldn’t upgrade to a higher version. I wiped out the entire installation and re-installed 1.6-rc1 and then now it works again. Thanks.

7

Here is a short description how to diagnose package version restrictions: Understanding package version restrictions in Julia | Blog by Bogumił Kamiński

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