[LUCENE-6801] PhraseQuery incorrectly advertises it supports terms at the same position

• Type: Bug
• Status: Reopened
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 5.4
• Component/s: core/search
• Lucene Fields: New
• Assignee: David Smiley
• Reporter: David Smiley
• Created: 12/Sep/15 06:17
• Updated: Yesterday 09:49
• Resolved: 23/Nov/15 18:36

Description

The following in PhraseQuery has been here since Sept 15th 2004 (by "goller"):

    /**
     * Adds a term to the end of the query phrase.
     * The relative position of the term within the phrase is specified explicitly.
     * This allows e.g. phrases with more than one term at the same position
     * or phrases with gaps (e.g. in connection with stopwords).
     * 
     */
    public Builder add(Term term, int position) {

Of course this isn't true; it's why we have MultiPhraseQuery. Yet we even allow you to have consecutive terms with the same positions. We shouldn't allow that; we should throw an exception. For my own sanity, I modified a simple MultiPhraseQuery test to use PhraseQuery instead and of course it didn't work.