Query.jl: "type UnionAll has no field parameters"

General Usage
1

I am playing around with Query.jl. I have a big dataset with many observations per day. I would like to group the observations together by observation date and then compute mean and variance of one indicator. I use the following code for the mean:

x = @from i in df
    @where Dates.year.(i.Date)>=2011
    @group i by i.Date into g
    @select {Date=g.key, mean=mean(g..compound)}
    @collect DataFrame
end

And it works perfectly fine. In contrast, trying to do the same with the variance:

x = @from i in df begin
    @where Dates.year.(i.Date)>=2011
    @group i by i.Date into g
    @select {Date=g.key, var=var(g..compound)}
    @collect DataFrame
end

Throws the following error:

type UnionAll has no field parameters
in collect at Query\src\sinks\sink_type.jl:2
in DataFrames.DataFrame at IterableTables\src\integrations\dataframes-dataarray.jl:127
in _DataFrame at IterableTables\src\integrations\dataframes-dataarray.jl:105
in column_types at TableTraits\src\utilities.jl:20 <inlined>

Does anybody know what this is about?

Edit: I get the same error for

x = @from i in df begin
    @where Dates.year.(i.Date)>=2011
    @group i by i.Date into g
    @select {Date=g.key, q80=quantile(g..compound,0.80)}
    @collect DataFrame
end
2

Possibly related to this bug in Base. Some discussion here where it popped up in the Junoverse.