Julian Hyde created CALCITE-4486: ------------------------------------ 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/]. -- This message was sent by Atlassian Jira (v8.3.4#803005)