[jira] [Created] (LUCENE-5677) Simplify position handling in DefaultIndexingChain

["Robert Muir (JIRA)" <ji...@apache.org>]

Robert Muir created LUCENE-5677:
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             Summary: Simplify position handling in DefaultIndexingChain
                 Key: LUCENE-5677
                 URL: https://issues.apache.org/jira/browse/LUCENE-5677
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Robert Muir
         Attachments: LUCENE-5677.patch

There are currently a ton of conditionals checking for various problems, as well as a horribly confusing unbalanced decrement + increment, and in general the code is a nightmare to follow.

To make it worse, besides being confusing it doesnt handle all cases: e.g. a negative position increment gap from the analyzer will just result in total chaos (corruption etc).

I think an easier way to implement this is to init fieldinvertstate.position to -1, and for the logic to be:

{code}
  position += posincr;
  check that position >= 0 && position >= lastPosition
  lastPosition = position;
{code}




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