Julian Hyde created CALCITE-4486:
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Summary: UNIQUE predicate
Key: CALCITE-4486
URL: https://issues.apache.org/jira/browse/CALCITE-4486
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Implement the UNIQUE predicate, as specified by the SQL standard.
Example:
{code:java}
UNIQUE (SELECT publishedIn FROM Book
WHERE authorId = 3)
NOT UNIQUE (SELECT publishedIn FROM BOOK
WHERE authorId = 3)
{code}
{{UNIQUE}} returns {{FALSE}} if the query returns two or more rows that do not
include NULL values and are equal. Like {{EXISTS}}, it never returns
{{UNKNOWN}}.
More details at
[JOOQ|https://www.jooq.org/doc/3.0/manual/sql-building/conditional-expressions/unique-predicate/].
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