&res created ARROW-18439:
----------------------------
Summary: Misleading message when loading parquet data with invalid
null data
Key: ARROW-18439
URL: https://issues.apache.org/jira/browse/ARROW-18439
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Affects Versions: 10.0.1
Reporter: &res
I'm saving an arrow table to parquet. One column is a list of structs, which
elements are marked as non nullable. But the data isn't valid because I've put
a null in one of the nested field.
When I save this data to parquet and try to load it back I get a very
misleading message:
{code:java}
Length spanned by list offsets (2) larger than values array (length 1){code}
I would rather arrow complains when creating the table or when saving it to
parquet.
Here's how to reproduce the issue:
{code:java}
struct = pa.struct(
[
pa.field("nested_string", pa.string(), nullable=False),
]
)
schema = pa.schema(
[pa.field("list_column", pa.list_(pa.field("item", struct,
nullable=False)))]
)
table = pa.table(
{"list_column": [[{"nested_string": ""}, {"nested_string": None}]]},
schema=schema
)
with io.BytesIO() as file:
pq.write_table(table, file)
file.seek(0)
pq.read_table(file) # Raises pa.ArrowInvalid
{code}
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