[
https://issues.apache.org/jira/browse/CALCITE-4486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
duan xiong updated CALCITE-4486:
--------------------------------
Description:
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 Issue support the UNIQUE predicate by set {{isExpand}} to return false, so
sub-queries are converted to {{RexSubQuery}} expressions and handled later by
{{SubQueryRemoveRule}}.
was:
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/].
> UNIQUE predicate
> ----------------
>
> Key: CALCITE-4486
> URL: https://issues.apache.org/jira/browse/CALCITE-4486
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: duan xiong
> Priority: Major
>
> 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 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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