xvrl opened a new pull request #8391: Fix ConcurrentModificationException in JDK11 URL: https://github.com/apache/incubator-druid/pull/8391 When building column/dimension selectors, calling computeIfAbsent can cause the applied function to modify the same cache through virtual column references. The JDK11 map implementation detects this change and will throw an exception. This fix – while not as elegant – breaks the single call into two steps to avoid this problem. relates to #5589
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