basetokenstreamtestcase should fail if tokenstream starts with posinc=0
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Key: LUCENE-3848
URL: https://issues.apache.org/jira/browse/LUCENE-3848
Project: Lucene - Java
Issue Type: Bug
Reporter: Robert Muir
Fix For: 3.6, 4.0
This is meaningless for a tokenstream to start with posinc=0,
Its also caused problems and hairiness in the indexer (LUCENE-1255,
LUCENE-1542),
and it makes senseless tokenstreams. We should add a check and fix any that do
this.
Furthermore the same bug can exist in removing-filters if they have
enablePositionIncrements=false.
I think this option is useful: but it shouldnt mean 'allow broken tokenstream',
it just means we
don't add gaps.
If you remove tokens with enablePositionIncrements=false it should not cause
the TS to start with
positionincrement=0, and it shouldnt 'restructure' the tokenstream (e.g. moving
synonyms on top of a different word).
It should just not add any 'holes'.
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