Yuanjian Li created SPARK-30207:
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Summary: Enhance the SQL NULL Semantics document
Key: SPARK-30207
URL: https://issues.apache.org/jira/browse/SPARK-30207
Project: Spark
Issue Type: Improvement
Components: Documentation, SQL
Affects Versions: 3.0.0
Reporter: Yuanjian Li
Enhancement of the SQL NULL Semantics document: sql-ref-null-semantics.html.
Clarify the behavior of `UNKNOW` for both `EXIST` and `IN` operation.
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