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count() and plan_files() return nothing for an expired snapshot id #4197
Description
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.
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: 295003531889393679An 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
Activity
dragonknightk commentedon Oct 31, 2026
Thanks for the report and the clear repro! I've opened #4218 for this and I'm taking it (´｡• ᵕ •｡
)plan_files()andcount()now raiseSnapshot not foundfor an id that is not in the metadata, the same errorto_arrow()` already raises ʕ•ᴥ•ʔ