Gus Heck created LUCENE-9008:
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Summary: Surround Query Parser NOT operator is binary (sort of)
Key: LUCENE-9008
URL: https://issues.apache.org/jira/browse/LUCENE-9008
Project: Lucene - Core
Issue Type: Bug
Components: core/queryparser
Affects Versions: 8.3
Reporter: Gus Heck
The following query works in the surround query parser (tested via solr):
{code:java}
foo NOT bar{code}
However despite the Solr ref guide specifically noting that "NOT" is unary, the
following throw parsing exceptions (also tested in solr):
{code:java}
foo AND NOT bar{code}
{code:java}
NOT bar AND foo{code}
additionally the right hand side of NOT requires parenthesis for fielded
terms...
{code:java}
fizz NOT game:buzz {code}
throws an exception whereas
{code:java}
fizz NOT (game:buzz) {code}
keeps the parser happy.
The binary syntax may be intentional and certainly has a nice readability. The
parenthesis around fielded stuff seems arbitrary and just irritating. However,
this parser has been around for a long time so we probably won't want to go
changing it fundamentally.
I suggest that this ticket should provide some docs clarifying at least this
surprising syntax in the lucene package javadoc, the solr parser factory class
javadocs and the solr ref guide docs
([https://lucene.apache.org/solr/guide/8_1/other-parsers.html]) should be
corrected and expanded to at least clarify this surprising and quirky binary
NOT syntax.
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