drcrallen commented on issue #9111: Add HashJoinSegment, a virtual segment for joins. URL: https://github.com/apache/druid/pull/9111#issuecomment-569739754 This is super cool thank you for putting this together. I would love to see a `README.md` (or similar) going over the high level mechanics of the join to help understand its limitations. I see a few comments scattered among classes but don't quite see the high level data flow. Is it all captured in https://github.com/apache/druid/issues/8728 , or are there more nuances in this PR since it is a foundation PR?
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