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### What changes were proposed in this pull request? Before SPARK-31511 is fixed, `BytesToBytesMap` iterator() is not thread-safe and may cause data inaccuracy. We need to add a unit test. ### Why are the changes needed? Increase test coverage to ensure that iterator() is thread-safe. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? add ut Closes #29669 from cxzl25/SPARK-31511-test. Authored-by: sychen <sychen@ctrip.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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