Christoph Kaser created LUCENE-4773:
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Summary: QueryParserBase should not throw ParseException in
getPrefixQuery when termStr starts with *
Key: LUCENE-4773
URL: https://issues.apache.org/jira/browse/LUCENE-4773
Project: Lucene - Core
Issue Type: Bug
Components: core/queryparser
Affects Versions: 4.1, 4.0
Reporter: Christoph Kaser
Priority: Minor
The method getPrefixQuery of
org.apache.lucene.queryparser.classic.QueryParserBase checks for leading
*-wildcards:
{code:java}
protected Query getPrefixQuery(String field, String termStr) throws
ParseException
{
if (!allowLeadingWildcard && termStr.startsWith("*"))
throw new ParseException("'*' not allowed as first character in
PrefixQuery");
...
}
{code}
However, the passed termStr is already unescaped in handleBareTokenQuery(...):
{code:java}
q = getPrefixQuery(qfield,
discardEscapeChar(term.image.substring
(0, term.image.length()-1)));
{code}
Therefore, a search query like this one results in a ParseException, even
though the first wildcard is escaped:
{noformat}
title:\*a*
{noformat}
I don't think there is any sense in checking for leading wildcards in
getPrefixQuery, as the passed termStr is already used literally, without paying
attention to special characters at all.
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