Hi, I had a few questions:

- Where is the code located that reads segment files for separate columns and 
joins them together? 
- Where is the code that writes/reads segment files to/from disk?
- For float/int compression strategies:
  - Does druid sort the floats/int before compressing?
  - If sorting happens before storing on disk, how are the row ids determined 
from the sorted values.
- Does druid support variable length columns?
- If variable length columns are supported, how are the row ids determined from 
the variable length data?

[ Full content available at: 
https://github.com/apache/incubator-druid/issues/6341 ]
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