Andy Webb created SOLR-14189:
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Summary: Some whitespace characters bypass zero-length test in
query parsers
Key: SOLR-14189
URL: https://issues.apache.org/jira/browse/SOLR-14189
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: query parsers
Reporter: Andy Webb
The edismax and some other query parsers treat pure whitespace queries as empty
queries, but they use Java's {{String.trim()}} method to normalise queries.
That method only treats characters 0-32 as whitespace. Other whitespace
characters exist - such as {{U+3000 IDEOGRAPHIC SPACE}} - which bypass the test
and lead to {{400 Bad Request}} responses - see for example
{{/solr/mycollection/select?q=%E3%80%80&defType=edismax}} vs
{{/solr/mycollection/select?q=%20&defType=edismax}}. The first fails with the
exception:
{noformat}
org.apache.solr.search.SyntaxError: Cannot parse '': Encountered "<EOF>" at
line 1, column 0. Was expecting one of: <NOT> ... "+" ... "-" ... <BAREOPER>
... "(" ... "*" ... <QUOTED> ... <TERM> ... <PREFIXTERM> ... <WILDTERM> ...
<REGEXPTERM> ... "[" ... "{" ... <LPARAMS> ... "filter(" ... <NUMBER> ...
<TERM> ...
{noformat}
(PR incoming!)
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