Fix OffsetArray support and clean CategoricalArray support
#556
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Invalid indices were used with
OffsetArrays as 1-based indexing was assumed. Fix this, and always wrap them in aToArrowobjet so that they are consistently turned into 1-based arrays.This allows dropping special code for
CategoricalArrayin favor of using the standardDataAPI.refpoolAPI combined with the Arrow extension point added to CategoricalArrays (JuliaData/CategoricalArrays.jl#415).If this looks good I'll backport JuliaData/CategoricalArrays.jl#415 to a minor CategoricalArrays release, as currently it's only on master (soon to become 1.0), which explains why CI fails. Another interesting option would be to move the Arrow-CategoricalArrays extension to Arrow, which would ensure support works even with older CategoricalArray versions. Let me know what you think.