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https://issues.apache.org/jira/browse/ARROW-15652?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Antoine Pitrou resolved ARROW-15652.
------------------------------------
Fix Version/s: 8.0.0
Resolution: Fixed
Issue resolved by pull request 12434
[https://github.com/apache/arrow/pull/12434]
> [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
> Assignee: Antoine Pitrou
> Priority: Major
> Labels: pull-request-available
> Fix For: 8.0.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> 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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