srilman opened a new issue, #1778:
URL: https://github.com/apache/iceberg-python/issues/1778
### Apache Iceberg version
0.9.0 (latest release)
### Please describe the bug 🐞
When attempting to apply filter to top-level struct columns, such as null /
not-null, an error occurs. For example:
```py
from pyiceberg.catalog.sql import SqlCatalog
from pyiceberg.schema import Schema
from pyiceberg.types import NestedField, StructType, IntegerType, StringType
import pyiceberg.expressions as pe
import pyarrow as pa
catalog = SqlCatalog("sql_catalog", uri="sqlite:///:memory:")
catalog.create_namespace("ns")
schema = Schema(
NestedField(1, "structs", StructType(
NestedField(2, "id", IntegerType(), required=True),
NestedField(3, "name", StringType(), required=True),
)),
)
table = catalog.create_table("ns.struct_table", schema,
"/tmp/wh/ns/struct_table")
df = pa.Table.from_pydict({
"structs": [
{"id": 1, "name": "a"},
{"id": 2, "name": "b"},
{"id": 3, "name": "c"},
]
}, schema=schema.as_arrow())
table.append(df)
print(list(table.scan(row_filter=pe.NotNull("structs")).plan_files()))
```
```
Traceback (most recent call last):
File "/Users/slade/bodo/mono/develop/test.py", line 27, in <module>
print(list(table.scan(row_filter=pe.NotNull("structs")).plan_files()))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/slade/bodo/mono/develop/.pixi/envs/default/lib/python3.12/site-packages/pyiceberg/table/__init__.py",
line 1697, in plan_files
if manifest_evaluators[manifest_file.partition_spec_id](manifest_file)
~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
File
"/Users/slade/bodo/mono/develop/.pixi/envs/default/lib/python3.12/site-packages/pyiceberg/expressions/__init__.py",
line 201, in bind
accessor = schema.accessor_for_field(field.field_id)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/slade/bodo/mono/develop/.pixi/envs/default/lib/python3.12/site-packages/pyiceberg/schema.py",
line 280, in accessor_for_field
raise ValueError(f"Could not find accessor for field with id:
{field_id}")
ValueError: Could not find accessor for field with id: 1
```
It looks like the cause is an intention feature of the field to accessor map
for schemas. See the docstring of class `_BuildPositionAccessors`:
```py
class _BuildPositionAccessors(SchemaVisitor[Dict[Position, Accessor]]):
"""A schema visitor for generating a field ID to accessor index.
Example:
>>> from pyiceberg.schema import Schema
>>> from pyiceberg.types import *
>>> schema = Schema(
... NestedField(field_id=2, name="id", field_type=IntegerType(),
required=False),
... NestedField(field_id=1, name="data",
field_type=StringType(), required=True),
... NestedField(
... field_id=3,
... name="location",
... field_type=StructType(
... NestedField(field_id=5, name="latitude",
field_type=FloatType(), required=False),
... NestedField(field_id=6, name="longitude",
field_type=FloatType(), required=False),
... ),
... required=True,
... ),
... schema_id=1,
... identifier_field_ids=[1],
... )
>>> result = build_position_accessors(schema)
>>> expected = {
... 2: Accessor(position=0, inner=None),
... 1: Accessor(position=1, inner=None),
... 5: Accessor(position=2, inner=Accessor(position=0,
inner=None)),
... 6: Accessor(position=2, inner=Accessor(position=1,
inner=None))
... }
>>> result == expected
True
"""
```
But I'm not exactly sure why. Looking at all uses, I don't see a reason why
the id_to_accessor map shouldn't include top-level structs. Is there a reason
why, or is this just a bug? If its just a bug, I think this is a 1-2 line fix
in `_BuildPositionAccessors`.
### Willingness to contribute
- [x] I can contribute a fix for this bug independently
- [ ] I would be willing to contribute a fix for this bug with guidance from
the Iceberg community
- [ ] I cannot contribute a fix for this bug at this time
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