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properties.add抛出UnsupportedException异常
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search 方法的 properties 支持传 Collections.singletonList("*")，代表查询所有字段。 但是 Collections.singletonList 是一个不可变的 List，所以不能直接调用 properties.add。 如果重写了 search 方法，想要在 properties 添加额外查询的字段 ```java List<String> newProperties = new ArrayList<>(properties); newProperties.add("name"); ```
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