[jira] [Created] (ARROW-14314) [C++] Sorting dictionary array not implemented

["Neal Richardson (Jira)" <ji...@apache.org>]

Neal Richardson created ARROW-14314:
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             Summary: [C++] Sorting dictionary array not implemented
                 Key: ARROW-14314
                 URL: https://issues.apache.org/jira/browse/ARROW-14314
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Neal Richardson
             Fix For: 7.0.0


From R, taking the stock {{mtcars}} dataset and giving it a dictionary type column:

{code}
mtcars %>% 
  mutate(cyl = as.factor(cyl)) %>% 
  Table$create() %>% 
  arrange(cyl) %>% 
  collect()

Error: Type error: Sorting not supported for type dictionary<values=string, indices=int8, ordered=0>
../src/arrow/compute/kernels/vector_array_sort.cc:427  VisitTypeInline(type, this)
../src/arrow/compute/kernels/vector_sort.cc:148  GetArraySorter(*physical_type_)
../src/arrow/compute/kernels/vector_sort.cc:1206  sorter.Sort()
../src/arrow/compute/api_vector.cc:259  CallFunction("sort_indices", {datum}, &options, ctx)
../src/arrow/compute/exec/order_by_impl.cc:53  SortIndices(table, options_, ctx_)
../src/arrow/compute/exec/sink_node.cc:292  impl_->DoFinish()
../src/arrow/compute/exec/exec_plan.cc:297  iterator_.Next()
../src/arrow/record_batch.cc:318  ReadNext(&batch)
../src/arrow/record_batch.cc:329  ReadAll(&batches)
{code}



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