kevinjqliu commented on issue #1798:
URL:
https://github.com/apache/iceberg-python/issues/1798#issuecomment-2764704243
I suspect the issue is with the schema definition
```
schema = Schema(
NestedField(field_id=1, name="name", field_type=StringType(),
required=False),
NestedField(
field_id=3,
name="my_list",
field_type=ListType(
element_id=45, element=StringType(), element_required=False
),
required=False,
),
)
```
or how we handle the schema conversion internally, between iceberg schema
and pyarrow schema.
For example, using the example iceberg schema provided, i get a schema
mismatch
```
# not working
from pyiceberg.catalog import load_catalog
import pyarrow as pa
from pyiceberg.schema import Schema
from pyiceberg.types import NestedField, StringType, ListType
from pyiceberg.io.pyarrow import schema_to_pyarrow
catalog = load_catalog(**dict(type="in-memory"))
schema = Schema(
NestedField(field_id=1, name="name", field_type=StringType(),
required=False),
NestedField(
field_id=3,
name="my_list",
field_type=ListType(
element_id=45, element=StringType(), element_required=False
),
required=False,
),
)
pyarrow_schema = schema_to_pyarrow(schema)
# create table
catalog.create_namespace_if_not_exists("test")
catalog.create_table_if_not_exists("test.table", pyarrow_schema)
# append data
df_1 = pa.Table.from_pylist([
{"name": "one", "my_list": ["test"]},
{"name": "another", "my_list": ["test"]},
], schema=pyarrow_schema)
catalog.load_table("test.table").append(df_1)
catalog.load_table("test.table").scan().to_arrow()
# append more data
df_2 = pa.Table.from_pylist([
{"name": "one"},
{"name": "another"},
], schema=pyarrow_schema)
catalog.load_table("test.table").append(df_2)
catalog.load_table("test.table").scan().to_arrow()
```
```
ValueError: Mismatch in fields:
┏━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ ┃ Table field ┃ Dataframe field
┃
┡━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ ✅ │ 1: name: optional string │ 1: name: optional string │
│ ✅ │ 2: my_list: optional list<string> │ Missing │
│ ❌ │ 3: element: optional string │ 3: my_list: optional list<string> │
└────┴───────────────────────────────────┴───────────────────────────────────┘
```
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