asdf2014 commented on issue #6904: add bloom filter druid expression URL: https://github.com/apache/incubator-druid/pull/6904#issuecomment-457162088 > Instances of {@link Decoder} class are safe for use by multiple concurrent threads. @clintropolis Yep, I agree with you. In addition, I found the above comment from JDK, so that we can also hold the instance of `Decoder` and `Encoder` in the `StringUtils` class without worrying about the multi-thread problem. (Although, Base64.Encoder#RFC4648 is still a single instance :sweat_smile:)
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