Yicong Huang created SPARK-55666:
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Summary: [PYTHON][TEST] test_join_ambiguous_cols is flaky due to
non-deterministic row order
Key: SPARK-55666
URL: https://issues.apache.org/jira/browse/SPARK-55666
Project: Spark
Issue Type: Bug
Components: PySpark
Affects Versions: 4.2.0
Reporter: Yicong Huang
The test {{test_join_ambiguous_cols}} in
{{python/pyspark/sql/tests/connect/test_connect_basic.py}} uses
{{assertEqual(cdf.collect(), sdf.collect())}} to compare join results without
sorting, which can fail non-deterministically because join does not guarantee
row order.
Affected assertions (lines 324, 330, 340, 346, 352): all use
{{assertEqual(x.collect(), y.collect())}} directly.
Fix: replace with {{assertEqual(sorted(x.collect()), sorted(y.collect()))}} for
all 5 assertions.
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