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Posted to jira@arrow.apache.org by "Simon Weiß (Jira)" <ji...@apache.org> on 2022/07/20 07:05:00 UTC
[jira] [Created] (ARROW-17138) [Python] Converting data frame to Table with large nested column fails `Invalid Struct child array has length smaller than expected`
Simon Weiß created ARROW-17138:
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Summary: [Python] Converting data frame to Table with large nested column fails `Invalid Struct child array has length smaller than expected`
Key: ARROW-17138
URL: https://issues.apache.org/jira/browse/ARROW-17138
Project: Apache Arrow
Issue Type: Bug
Components: Python
Reporter: Simon Weiß
Hey,
I have a data frame for which one column is a nested struct array. Converting it to a `pyarrow.Table` fails if the data frame gets too big. I could reproduce the bug with a minimal example with anonymized data that is roughly similar to mine. When I set, e.g., `N_ROWS=500_000`, or smaller, it is working fine.
```python
import pandas as pd
import pyarrow as pa
N_ROWS = 800_000
item_record = {
"someImportantAssets": [
{
"square": "https://some.super.loooooooooong.link.com/withmany/lorem/upload/ipsum/stilllooooooooooonger/lorem/\{someparameter}/156fdjjf644984dfdfaera648/specificLink-i15348891"
}
],
"id": "i15348891",
"title": "Some Long Item Title i15348891",
}
user_record = {
"userId": "faa4648-4964drf-64648fafa648-4648falj",
"data": [item_record for _ in range(24)],
}
df = pd.DataFrame([user_record for _ in range(N_ROWS)])
table = pa.Table.from_pandas(df)
```
```python-traceback
Traceback (most recent call last):
table = pa.Table.from_pandas(df)
File "pyarrow/table.pxi", line 1658, in pyarrow.lib.Table.from_pandas
File "pyarrow/table.pxi", line 1702, in pyarrow.lib.Table.from_arrays
File "pyarrow/table.pxi", line 1314, in pyarrow.lib.Table.validate
File "pyarrow/error.pxi", line 99, in pyarrow.lib.check_status
pyarrow.lib.ArrowInvalid: Column 1: In chunk 0: Invalid: List child array invalid: Invalid: Struct child array #1 invalid: Invalid: List child array invalid: Invalid: Struct child array #0 has length smaller than expected for struct array (13256071 < 13256072)
```
The length is always smaller than expected by 1.
h2. Expected behavior:
Run without errors or fail with a better error message.
h2. System Info and Versions:
Apple M1 Pro but also happened on amd64 Linux machine on AWS
```
arrow-cpp 7.0.0 py39h8a997f0_8_cpu conda-forge
pyarrow 7.0.0 py39h3a11367_8_cpu conda-forge
python 3.9.7 h54d631c_3_cpython conda-forge
```
I could also reproduce with `pyarrow 8.0.0`
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