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Posted to jira@arrow.apache.org by "Joris Van den Bossche (Jira)" <ji...@apache.org> on 2022/10/20 13:56:00 UTC
[jira] [Assigned] (ARROW-16503) [C++] Can't concatenate extension arrays
[ https://issues.apache.org/jira/browse/ARROW-16503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Joris Van den Bossche reassigned ARROW-16503:
---------------------------------------------
Assignee: Joris Van den Bossche
> [C++] Can't concatenate extension arrays
> ----------------------------------------
>
> Key: ARROW-16503
> URL: https://issues.apache.org/jira/browse/ARROW-16503
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Dewey Dunnington
> Assignee: Joris Van den Bossche
> Priority: Major
> Labels: good-second-issue
>
> It looks like Arrays with an extension type can't be concatenated. From the R bindings:
> {code:R}
> library(arrow, warn.conflicts = FALSE)
> arr <- vctrs_extension_array(1:10)
> concat_arrays(arr, arr)
> #> Error: NotImplemented: concatenation of integer(0)
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/array/concatenate.cc:195 VisitTypeInline(*out_->type, this)
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/array/concatenate.cc:590 ConcatenateImpl(data, pool).Concatenate(&out_data)
> {code}
> This shows up more practically when using the query engine:
> {code:R}
> library(arrow, warn.conflicts = FALSE)
> table <- arrow_table(
> group = rep(c("a", "b"), 5),
> col1 = 1:10,
> col2 = vctrs_extension_array(1:10)
> )
> tf <- tempfile()
> table |> dplyr::group_by(group) |> write_dataset(tf)
> open_dataset(tf) |>
> dplyr::arrange(col1) |>
> dplyr::collect()
> #> Error in `dplyr::collect()`:
> #> ! NotImplemented: concatenation of extension<arrow.r.vctrs>
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/array/concatenate.cc:195 VisitTypeInline(*out_->type, this)
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/array/concatenate.cc:590 ConcatenateImpl(data, pool).Concatenate(&out_data)
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/compute/kernels/vector_selection.cc:2025 Concatenate(values.chunks(), ctx->memory_pool())
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/compute/kernels/vector_selection.cc:2084 TakeCA(*table.column(j), indices, options, ctx)
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/compute/exec/sink_node.cc:527 impl_->DoFinish()
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/compute/exec/exec_plan.cc:467 iterator_.Next()
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/record_batch.cc:337 ReadNext(&batch)
> #> /Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/record_batch.cc:351 ToRecordBatches()
> {code}
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