RyanLin5967 opened a new issue, #4197:
URL: https://github.com/apache/iceberg-python/issues/4197
### Apache Iceberg version
0.12.0 (latest release)
### Please describe the bug 🐞
Currently, `plan_files()` returns no tasks when the scan's `snapshot_id`
names no snapshot, so `count()` of an expired snapshot is 0. `to_arrow()` on
the same scan raises.
```python
import tempfile
import pyarrow as pa
from pyiceberg.catalog.sql import SqlCatalog
cat = SqlCatalog("c", uri="sqlite:///:memory:",
warehouse=f"file://{tempfile.mkdtemp()}")
cat.create_namespace("ns")
t = cat.create_table("ns.t", schema=pa.schema([("x", pa.int64())]))
t.append(pa.table({"x": [1, 2]}))
s1 = t.current_snapshot().snapshot_id
t.append(pa.table({"x": [3]}))
t.maintenance.expire_snapshots().by_id(s1).commit()
print(t.scan(snapshot_id=s1).count(),
list(t.scan(snapshot_id=s1).plan_files()))
# 0 [], should raise like to_arrow()
t.scan(snapshot_id=s1).to_arrow()
# ValueError: Snapshot not found: 295003531889393679
```
An id the table never had does the same.
tested on pyiceberg 0.12.0 and main
### Willingness to contribute
- [ ] 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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