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# File 'lib/object_table.rb', line 88
def join(other, key, options={})
type = (options[:type] || 'inner')
key = [key] unless key.is_a?(Array)
lkeys = key.map{|k| get_column(k).to_a}.transpose
rkeys = key.map{|k| other[k].to_a}.transpose
rgroups = rkeys.each_with_index.group_by(&:first)
rgroups.each{|k, v| rgroups[k] = v.transpose[-1]}
rindex = rgroups.values_at(*lkeys)
lindex = lkeys.each_with_index.zip(rindex).flat_map{|(k, i), r| [i] * r.length if r}
lindex.compact!
right_cols = other.colnames - key
left_cols = colnames
if type == 'left' or type == 'outer'
lmissing = NArray.to_na(rindex.map{|x| x ? 0 : 1}).where.to_a
lindex += lmissing
rindex += [-1] * lmissing.length
end
if type == 'right' or type == 'outer'
left_cols -= key
rmissing = rgroups.values - rindex
rmissing.flatten!
lindex += [-1] * rmissing.length
rindex += rmissing
end
rindex.flatten!.compact!
lindex = NArray.to_na(lindex)
rindex = NArray.to_na(rindex)
lblank = lindex.eq(-1)
rblank = rindex.eq(-1)
left = left_cols.map do |k|
col = get_column(k)
padding = [nil] * (col.rank - 1)
col = col[*padding, lindex]
col[*padding, lblank] = [nil]
[k, col]
end
right = right_cols.map do |k|
col = other[k]
padding = [nil] * (col.rank - 1)
col = col[*padding, rindex]
col[*padding, rblank] = [nil]
[k, col]
end
keys = []
if type == 'right' or type == 'outer'
keys = key.map do |k|
col = get_column(k)
padding = [nil] * (col.rank - 1)
col = col[*padding, lindex]
col[*padding, lblank] = other[k][*padding, rmissing]
[k, col]
end
end
self.class.new(keys + left + right)
end
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