用于嵌套数组查询的 Couchbase 索引

Question

我正在尝试通过数组索引来加速下面的查询，但我无法正确完成。

SELECT count(*) FROM pacientes UNNEST COMPOSITION.content contentItem 
WHERE contentItem.items IS NOT NULL AND ANY i WITHIN contentItem.items 
SATISFIES i.archetype_id="at0007" AND i.`value`.`value` < 200 AND 
i.`value`.`value` > 100 END;

我已尝试创建以下索引，但没有一个有效：

CREATE INDEX idx_item_value ON pacientes (ARRAY i FOR i IN 
COMPOSITION.content.items.`value`.`value` WHEN i.archetype_id="at0007" END);

CREATE INDEX idx_item ON pacientes
(ARRAY i FOR i IN COMPOSITION.content.items END);

CREATE INDEX idx_item ON pacientes UNNEST COMPOSITION.content contentItem
(ARRAY i FOR i IN contentItem.items WHEN i.archetype_id="at0007" END);

有什么建议吗？

Answer 1

在您的 CREATE INDEX 语句中，使用 DISTINCT ARRAY 而不是 ARRAY。

这是修改后的查询和索引。

SELECT count(*)
FROM pacientes AS p
UNNEST COMPOSITION.content AS contentItem
WHERE
        ANY ci IN p.COMPOSITION.content SATISFIES
            ( ANY i WITHIN ci.items SATISFIES
                i.archetype_id="at0007"
                AND i.`value`.`value` < 200
                AND i.`value`.`value` > 100 END
            )
        END
;

CREATE INDEX idx_archetype ON pacientes( DISTINCT ARRAY ( DISTINCT ARRAY i.archetype_id FOR i WITHIN ci.items END ) FOR ci IN COMPOSITION.content END );

CREATE INDEX idx_value ON pacientes( DISTINCT ARRAY ( DISTINCT ARRAY i.`value`.`value` FOR i WITHIN ci.items END ) FOR ci IN COMPOSITION.content END );