gin_trgm_ops 索引创建失败

Question

我正在尝试在包含名称的文本字段上创建三元组索引。我已将 pg_trgm 扩展添加到架构中。运行\dx显示已启用：

List of installed extensions
   Name    | Version |   Schema   |                            Description                            
-----------+---------+------------+-------------------------------------------------------------------
 btree_gin | 1.3     | pg_catalog | support for indexing common datatypes in GIN
 dblink    | 1.2     | wos_core   | connect to other PostgreSQL databases from within a database
 pg_trgm   | 1.4     | wos_core   | text similarity measurement and index searching based on trigrams
 plpgsql   | 1.0     | pg_catalog | PL/pgSQL procedural language
(4 rows)

但是，当我运行以下命令时：

CREATE INDEX authors_full_name_idx ON wos_core.interface_table USING GIN (authors_full_name gin_trgm_ops);

我得到以下信息：

ERROR:  operator class "gin_trgm_ops" does not exist for access method "gin"

谁能告诉我我做错了什么？

                                                 version                                                 
---------------------------------------------------------------------------------------------------------
 PostgreSQL 11.2 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-36), 64-bit

Answer 1

该架构wos_core可能不在您的 search_path 中。

在这种情况下，您需要在运算符前添加模式名称前缀：

创建索引authors_full_name_idx
       ON wos_core.interface_table 使用 GIN (authors_full_name wos_core .gin_trgm_ops);

或者，您可以更改用户的搜索路径，包括wos_core：

alter user your_username set search_path = 'public,wos_core,...';