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Question

索引列我有列col數據類型CHARACTER VARYING

我需要指數在列gin指數。如果想直接設置杜松子酒索引列，返回的錯誤：

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

如果想：

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

我得到錯誤：functions in index expression must be marked IMMUTABLE

如何創建gin指數CHARACTER VARYING列？

p.s.我需要這個全文搜索

Answer 1

試試這個代碼：

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