Joris Van den Bossche created ARROW-15652:
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Summary: [C++] GDB plugin printer gives error with extension type
Key: ARROW-15652
URL: https://issues.apache.org/jira/browse/ARROW-15652
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Joris Van den Bossche
Copying the example from ARROW-9078
{code}
import pyarrow as pa
import pyarrow.parquet as pq
class MyStructType(pa.PyExtensionType):
def __init__(self):
pa.PyExtensionType.__init__(self, pa.struct([('left', pa.int64()),
('right', pa.int64())]))
def __reduce__(self):
return MyStructType, ()
struct_array = pa.StructArray.from_arrays(
[
pa.array([0, 1], type="int64", from_pandas=True),
pa.array([1, 2], type="int64", from_pandas=True),
],
names=["left", "right"],
)
mystruct_array = pa.ExtensionArray.from_storage(MyStructType(), struct_array)
table = pa.table({'a': mystruct_array})
pq.write_table(table, "test_struct.parquet")
{code}
What I was doing is then reading the table back in, with a breakpoint at
{{ApplyOriginalMetadata}}. But I suppose any other way to get into the debugger
is fine as well (and maybe also with a simpler extension type, i.e. not with a
struct type as storage type, I didn't yet try that).
This gives:
{code}
(gdb) p origin_field
$3 = (const arrow::Field &) @0x555bbb308190: Python Exception <class
'gdb.error'> A syntax error in expression, near `)
(0x555bbb277020)).ToString()'.:
arrow::field("a", )
{code}
for the field/type being extension type
cc [~apitrou]
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