SCORE（Lakehouse v1）

返回查询字符串的相关度。分数越高，数据越相关。请注意，SCORE 函数只能与 QUERY 或 MATCH 函数一起使用。

PlaidCloud Lakehouse 的 SCORE 函数受 Elasticsearch 的 SCORE 启发。

SQL 语法

SCORE()

SQL 示例

CREATE TABLE test(title STRING, body STRING);

CREATE INVERTED INDEX idx ON test(title, body);

INSERT INTO test VALUES
('The Importance of Reading', 'Reading is a crucial skill that opens up a world of knowledge and imagination.'),
('The Benefits of Exercise', 'Exercise is essential for maintaining a healthy lifestyle.'),
('The Power of Perseverance', 'Perseverance is the key to overcoming obstacles and achieving success.'),
('The Art of Communication', 'Effective communication is crucial in everyday life.'),
('The Impact of Technology on Society', 'Technology has revolutionized our society in countless ways.');

-- Retrieve documents where the 'title' column contains the keyword 'art' with a boost of 5 and the 'body' column contains the keyword 'reading' with a boost of 1.2, along with their relevance scores
SELECT *, score() FROM test WHERE QUERY('title:art^5 body:reading^1.2');

┌────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│           title           │                                      body                                      │  score()  │
├───────────────────────────┼────────────────────────────────────────────────────────────────────────────────┼───────────┤
│ The Importance of Reading │ Reading is a crucial skill that opens up a world of knowledge and imagination. │ 1.3860708 │
│ The Art of Communication  │ Effective communication is crucial in everyday life.                           │ 7.1992116 │
└────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

-- Retrieve documents where the 'title' column contains the keyword 'reading' with a boost of 5 and the 'body' column contains the keyword 'everyday' with a boost of 1.2, along with their relevance scores
SELECT *, score() FROM test WHERE MATCH('title^5, body^1.2', 'reading everyday');

┌────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│           title           │                                      body                                      │  score()  │
├───────────────────────────┼────────────────────────────────────────────────────────────────────────────────┼───────────┤
│ The Importance of Reading │ Reading is a crucial skill that opens up a world of knowledge and imagination. │  8.585282 │
│ The Art of Communication  │ Effective communication is crucial in everyday life.                           │ 1.8575745 │
└────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘