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  1. Calcite
  2. CALCITE-4486

UNIQUE predicate

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      Implement the UNIQUE predicate, as specified by the SQL standard.

      Example:

      UNIQUE (SELECT publishedIn FROM Book
                  WHERE authorId = 3)
      
      NOT UNIQUE (SELECT publishedIn FROM BOOK
                  WHERE authorId = 3)
      

      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.

      This Issue support the UNIQUE predicate by set isExpand to return false, so sub-queries are converted to RexSubQuery expressions and handled later by SubQueryRemoveRule.

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            nobigo xiong duan
            julianhyde Julian Hyde
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