postgresql - Postgres全文索引

Question

CREATE INDEX message_fulltext_idx ON feedback USING gin(to_tsvector(message));

错误：索引谓词中的函数必须标记为 IMMUTABLE 

如何避免这种情况？

Answer 1

You need to include the optional config parameter. Without it, the function is not immutable. For example, if you want the standard English text parsing:

CREATE INDEX message_fulltext_idx ON feedback
  USING gin(to_tsvector('english', message));