select does not have method to handle Pair?

[longhua8800w]

julia version is 1.52
packages are:
using CSV
using DataFrames
using Pipe
using RData
using Statistics
my DataFrame is very simple:
df = @pipe train|>select(_, :v2 )
but when i use Pair in select， error happens such as：
select(df, :v2 => :a1)
##MethodError: no method matching getindex(::DataFrames.Index, ::Pair{Symbol,Symbol})
Closest candidates are:
getindex(::DataFrames.Index, !Matched::Symbol) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\other\index.jl:259
getindex(::DataFrames.Index, !Matched::AbstractArray{Symbol,1}) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\other\index.jl:260
getindex(::DataFrames.AbstractIndex, !Matched::Bool) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\other\index.jl:154
...

Stacktrace:
[1] select(::DataFrame, ::Pair{Symbol,Symbol}; copycols::Bool) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\dataframe\dataframe.jl:881
[2] select(::DataFrame, ::Pair{Symbol,Symbol}) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\dataframe\dataframe.jl:881
[3] top-level scope at In[6]:1
[4] include_string(::Function, ::Module, ::String, ::String) at .\loading.jl:1091
[5] execute_code(::String, ::String) at C:\Users\linghuxfeng.julia\packages\IJulia\a1SNk\src\execute_request.jl:27
[6] execute_request(::ZMQ.Socket, ::IJulia.Msg) at C:\Users\linghuxfeng.julia\packages\IJulia\a1SNk\src\execute_request.jl:86
[7] #invokelatest#1 at .\essentials.jl:710 [inlined]
[8] invokelatest at .\essentials.jl:709 [inlined]
[9] eventloop(::ZMQ.Socket) at C:\Users\linghuxfeng.julia\packages\IJulia\a1SNk\src\eventloop.jl:8
[10] (::IJulia.var"#15#18")() at .\task.jl:356

select(df, :v2 => (x -> x .- minimum(x)) => :vv2 )

MethodError: no method matching getindex(::DataFrames.Index, ::Pair{Symbol,Pair{var"#45#46",Symbol}})

Closest candidates are:
getindex(::DataFrames.Index, !Matched::Symbol) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\other\index.jl:259
getindex(::DataFrames.Index, !Matched::AbstractArray{Symbol,1}) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\other\index.jl:260
getindex(::DataFrames.AbstractIndex, !Matched::Bool) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\other\index.jl:154
...

Stacktrace:
[1] select(::DataFrame, ::Pair{Symbol,Pair{var"#1#2",Symbol}}; copycols::Bool) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\dataframe\dataframe.jl:881
[2] select(::DataFrame, ::Pair{Symbol,Pair{var"#1#2",Symbol}}) at C:\Users\linghuxfeng.julia\packages\DataFrames\S3ZFo\src\dataframe\dataframe.jl:881
[3] top-level scope at In[7]:1
[4] include_string(::Function, ::Module, ::String, ::String) at .\loading.jl:1091
[5] execute_code(::String, ::String) at C:\Users\linghuxfeng.julia\packages\IJulia\a1SNk\src\execute_request.jl:27
[6] execute_request(::ZMQ.Socket, ::IJulia.Msg) at C:\Users\linghuxfeng.julia\packages\IJulia\a1SNk\src\execute_request.jl:86
[7] #invokelatest#1 at .\essentials.jl:710 [inlined]
[8] invokelatest at .\essentials.jl:709 [inlined]
[9] eventloop(::ZMQ.Socket) at C:\Users\linghuxfeng.julia\packages\IJulia\a1SNk\src\eventloop.jl:8
[10] (::IJulia.var"#15#18")() at .\task.jl:356

it seems that DataFrames select does not have method to handle Pair.

[bkamins]

You are using DataFrames.jl version 0.20.2. Please update the package to the latest version (at this moment 0.21.8, soon it will be 0.22). This will fix the problem.

[longhua8800w]

I update DataFrames to 0.21.8, problem fixed