mSitkovets commented on pull request #11170:
URL: https://github.com/apache/druid/pull/11170#issuecomment-831495874


   I added new variables `cachedIsNull` and `outputForNull` so that once we 
have cached the output for null once then any other time we see null as input 
we can use our cached value. The original code was only caching the value if 
the nulls were consecutive. 


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