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[SPARK-25249][CORE][TEST] add a unit test for OpenHashMap
## What changes were proposed in this pull request? This PR adds a unit test for OpenHashMap , this can help developers to distinguish between the 0/0.0/0L and null ## How was this patch tested? Closes #22241 from 10110346/openhashmap. Authored-by: liuxian <liu.xian3@zte.com.cn> Signed-off-by: Sean Owen <sean.owen@databricks.com>
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