用于全文搜索的索引列

Question

我有col数据类型的列CHARACTER VARYING

我需要将此列gin索引作为索引.如果尝试直接将gin索引设置为列,则返回错误:

data type character varying has no default operator class for access method "gin" HINT: You must specify an operator class for the index or define a default operator class for the data type

如果尝试:

 create index col_vector 
 on mytable 
 using gin (to_tsvector(col))

我收到了错误: functions in index expression must be marked IMMUTABLE

如何gin为CHARACTER VARYING列创建索引？

ps我需要这个用于全文搜索

Answer 1

试试此代码:

CREATE INDEX "name " ON "tablename" USING gin(to_tsvector('english', "columnname"));