jiaan.geng created SPARK-28580:
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Summary: ANSI SQL: unique predicate
Key: SPARK-28580
URL: https://issues.apache.org/jira/browse/SPARK-28580
Project: Spark
Issue Type: New Feature
Components: SQL
Affects Versions: 3.0.0
Reporter: jiaan.geng
Format
<unique predicate> ::=
UNIQUE <table subquery>
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