Update getindex.jl

Author: sl-solution

src/dataset/getindex.jl

@@ -27,8 +27,8 @@ _onebased_check_error(i, col) =
                         "column $i has starting index equal to $(firstindex(col))"))
 
 # note: these type assertions are required to pass tests
-nrow(ds::Dataset) = ncol(ds) > 0 ? length(_columns(ds)[1])::Int : 0
-ncol(ds::Dataset) = length(index(ds))
+DataAPI.nrow(ds::Dataset) = ncol(ds) > 0 ? length(_columns(ds)[1])::Int : 0
+DataAPI.ncol(ds::Dataset) = length(index(ds))
 
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