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The algorithm is EWAH, not WAH. It's also by Daniel lemire.

Last I checked (my Internet connection is wonky, so I can't verify right now), EWAH was based on WAH, so it's affected by the patent.

Sorry for the late reply. I was traveling for the past week or so.

In any case, EWAH is designed to avoid the WAH patent. According to the author, the Apache people checked things out when they adopted it for Apache Hive and they were apparently satisfied.

If Apache is satisfied, I think we are safe. :)

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