character varying(64)[]

我可以有一个空数组，例如{}为该字段的默认值？
设置的语法是什么？

如果设置方括号{}，我会收到以下错误：

sql error:

ERROR:  Syntax error at or near "{"
LINE 1: ...public"."accounts" ALTER COLUMN "pwd_history" SET DEFAULT {}
                                                                     ^

In statement:
ALTER TABLE "public"."accounts" ALTER COLUMN "pwd_history" SET DEFAULT {}