我使用SELECT
concat(extract(MONTH FROM u.created_at),
'-',extract(YEAR FROM u.created_at)) AS "Month-Year",
count(s1.user_id) AS "# of Users that Signed up on Any Cloud"
FROM (
SELECT user_id, created_at FROM cloud_storage_a
UNION
SELECT user_id, created_at FROM cloud_storage_b
UNION
SELECT user_id, created_at FROM cloud_storage_c
) AS s1
INNER JOIN users u ON u.id = s1.user_id
GROUP BY
1,
EXTRACT(MONTH from u.created_at),
EXTRACT(YEAR from u.created_at)
ORDER BY
EXTRACT(YEAR from u.created_at),
EXTRACT(MONTH from u.created_at);
删除了停用词并且还使用了一个词组。然而，当我有一个像＃34;心脏病和心脏病这样的短语时，会发生什么呢？分析器做的是它会删除＆＃34;和＃34;从短语的中间把它变成一个毫无意义的短语（输出是＆＃34;心脏病＆＃34;）。如何处理此问题并仅在必要时删除停用词？