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fix: adapt permutation tests and datafusion python to lance v9

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DataFusion 54 (pulled in by lance v9) replaced its hashing RandomState
(ahash -> foldhash), which changes hash-based split output. Update the
hardcoded expectations in test_hash_split, and hash a high-cardinality
column in the Python test_split_hash_with_discard so its discard behavior
is stable.

The new lance file reader returns no batches for an empty file (the old
read_record_batch returned a single empty batch), so concat_batches on
batches[0] panicked when a shuffle output file was empty. Build the batch
from the known schema instead, which handles the empty case.

Bump the datafusion Python package to v54 to match the bundled DataFusion,
avoiding an FFI ABI mismatch in register_table_provider.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Will Jones
2026-07-16 08:14:50 -07:00
co-authored by Claude Opus 4.8
parent 7ebfc71247
commit 6858a9370f
5 changed files with 37 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files
python/pyproject.toml
+1 -1
View File
@@ -65,7 +65,7 @@ tests = [
"pyarrow-stubs>=16.0",
"pylance>=7,<8",
"requests>=2.31.0",
"datafusion>=53,<54",
"datafusion>=54,<55",
"opentelemetry-sdk>=1.30.0",
]
dev = [
python/python/tests/test_permutation.py
+4 -1
View File
@@ -134,8 +134,11 @@ def test_split_hash_with_discard(mem_db):
)
permutation_tbl = (
# Hash a high-cardinality column: "category" has only two distinct
# values, so whether anything is discarded would hinge on where those
# two hashes land rather than on the discard weight.
permutation_builder(tbl)
.split_hash(["category"], [1, 1], discard_weight=2) # Should discard ~50%
.split_hash(["id"], [1, 1], discard_weight=2) # Should discard ~50%
.execute()
)
python/uv.lock
Generated
+23 -8
View File
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@@ -1951,7 +1966,7 @@ requires-dist = [
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