如何让 ts_headline 尊重phraseto_tsquery

Question

我有一个使用短语搜索来匹配整个短语的查询。

SELECT ts_headline(
  'simple',
  'This is my test text. My test text has many words. Well, not THAT many words.',
  phraseto_tsquery('simple', 'text has many words')
);

结果是：

This is my test <b>text</b>. My test <b>text</b> <b>has</b> <b>many</b> <b>words</b>. Well, not THAT <b>many</b> <b>words</b>.

但我会预料到这一点：

This is my test text. My test <b>text</b> <b>has</b> <b>many</b> <b>words</b>. Well, not THAT many words.

或者理想情况下甚至是这样：

This is my test text. My test <b>text has many words</b>. Well, not THAT many words.

边注：

phraseto_tsquery('simple', 'text has many words')

相当于

to_tsquery('simple', 'text <-> has <-> many <-> words')

我不确定我是否做错了什么，或者 ts_headline 是否根本不支持这种突出显示。

Answer 1

phraseto_tsquery('simple', 'text has many words')生成正确的查询，但问题似乎出在ts_headline函数上。似乎已经报告了 BUG #155172。