aminghadersohi commented on code in PR #45912:
URL: https://github.com/apache/superset/pull/45912#discussion_r4458508618
##########
superset-core/src/superset_core/semantic_layers/testing.py:
##########
@@ -272,6 +290,56 @@ def test_imports_and_static_schema(
assert completed.returncode == 0, completed.stdout + completed.stderr
+def _assert_null_placement_witness(
+ query: SemanticQuery, view: SemanticView, expected: pa.Table
+) -> None:
+ """Require NULL values of the first order key where its placement puts
them.
+
+ The host's default chronological order asks for NULL values last; a
+ provider must honor a placement on any order key, before offset and limit.
+ The page must keep different rows from the ones the opposite placement
would.
+ """
+ assert query.order, "null_placement fixture requires an order"
+ first: tuple[object, ...] = query.order[0]
Review Comment:
Verified at f2dba096fa: the required secondary case rejects the
first-key-only mutant (1 failed, 1 passed) while the original 65-test suite
accepts it (65 passed, 4 skipped); the reference provider passes all 76 head
conformance tests.
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