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https://issues.apache.org/jira/browse/ARROW-17138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Weiß closed ARROW-17138.
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Resolution: Duplicate
> [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
> Priority: Major
>
> 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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