Alan Woodward created LUCENE-8509: ------------------------------------- Summary: NGramTokenizer, TrimFilter and WordDelimiterGraphFilter in combination can produce backwards offsets Key: LUCENE-8509 URL: https://issues.apache.org/jira/browse/LUCENE-8509 Project: Lucene - Core Issue Type: Task Reporter: Alan Woodward Assignee: Alan Woodward
Discovered by an elasticsearch user and described here: https://github.com/elastic/elasticsearch/issues/33710 The ngram tokenizer produces tokens "a b" and " bb" (note the space at the beginning of the second token). The WDGF takes the first token and splits it into two, adjusting the offsets of the second token, so we get "a"[0,1] and "b"[2,3]. The trim filter removes the leading space from the second token, leaving offsets unchanged, so WDGF sees "bb"[1,4]; because the leading space has already been stripped, WDGF sees no need to adjust offsets, and emits the token as-is, resulting in the start offsets of the tokenstream being [0, 2, 1], and the IndexWriter rejecting it. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org