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https://issues.apache.org/jira/browse/ARROW-10192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Antoine Pitrou reassigned ARROW-10192:
--------------------------------------

    Assignee: Antoine Pitrou

> [C++][Python] Segfault when converting nested struct array with dictionary 
> field to pandas series
> -------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-10192
>                 URL: https://issues.apache.org/jira/browse/ARROW-10192
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++, Python
>            Reporter: Krisztian Szucs
>            Assignee: Antoine Pitrou
>            Priority: Major
>
> Reproducer:
> {code:python}
> def test_struct_array_with_dictionary_field_to_pandas():
>     ty = pa.struct([
>         pa.field('dict', pa.dictionary(pa.int64(), pa.int32())),
>     ])
>     data = [
>         {'dict': -1859762450}
>     ]
>     arr = pa.array(data, type=ty)
>     arr.to_pandas()
> {code}
> Raises SIGSTOP:
> {code}
> * thread #1, stop reason = signal SIGSTOP
>   * frame #0: 0x00007fff6e2b733a libsystem_kernel.dylib`__pthread_kill + 10
>     frame #1: 0x00007fff6e373e60 libsystem_pthread.dylib`pthread_kill + 430
>     frame #2: 0x00007fff6e1ce93e libsystem_c.dylib`raise + 26
>     frame #3: 0x00007fff6e3685fd libsystem_platform.dylib`_sigtramp + 29
>     frame #4: 0x000000011517adfd 
> libarrow_python.200.0.0.dylib`arrow::py::ConvertStruct(options=0x00007f84fc5a0230,
>  data=0x00007f84fc59ef18, out_values=0x00007f84fc53d140) at 
> arrow_to_pandas.cc:685:54
>     frame #5: 0x000000011514c642 
> libarrow_python.200.0.0.dylib`arrow::py::ObjectWriterVisitor::Visit(this=0x00007ffee06a1a88,
>  type=0x00007f84fc5a00e8) at arrow_to_pandas.cc:1031:12
>     frame #6: 0x00000001151499c4 libarrow_python.200.0.0.dylib`arrow::Status 
> arrow::VisitTypeInline<arrow::py::ObjectWriterVisitor>(type=0x00007f84fc5a00e8,
>  visitor=0x00007ffee06a1a88) at visitor_inline.h:88:5
>     frame #7: 0x0000000115149305 
> libarrow_python.200.0.0.dylib`arrow::py::ObjectWriter::CopyInto(this=0x00007f84fc5a0228,
>  data=std::__1::shared_ptr<arrow::ChunkedArray>::element_type @ 
> 0x00007f84fc59ef18 strong=2 weak=1, rel_placement=0) at arrow_to_pand
> as.cc:1055:12
> {code}
> {code:cpp}
> frame #4: 0x000000011517adfd 
> libarrow_python.200.0.0.dylib`arrow::py::ConvertStruct(options=0x00007f84fc5a0230,
>  data=0x00007f84fc59ef18, out_values=0x00007f84fc53d140) at 
> arrow_to_pandas.cc:685:54
>    682            if (!arr->field(static_cast<int>(field_idx))->IsNull(i)) {
>    683              // Value exists in child array, obtain it
>    684              auto array = 
> reinterpret_cast<PyArrayObject*>(fields_data[field_idx].obj());
> -> 685              auto ptr = reinterpret_cast<const 
> char*>(PyArray_GETPTR1(array, i));
>    686              field_value.reset(PyArray_GETITEM(array, ptr));
>    687              RETURN_IF_PYERROR();
>    688            } else {
> {code}



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