QueryParser can produce empty sub BooleanQueries when Analyzer proudces no
tokens for input
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Key: LUCENE-933
URL: https://issues.apache.org/jira/browse/LUCENE-933
Project: Lucene - Java
Issue Type: Bug
Reporter: Hoss Man
as triggered by SOLR-261, if you have a query like this...
+foo:BBB +(yak:AAA baz:CCC)
...where the analyzer produces no tokens for the "yak:AAA" or "baz:CCC"
portions of the query (posisbly because they are stop words) the resulting
query produced by the QueryParser will be...
+foo:BBB +()
...that is a BooleanQuery with two required clauses, one of which is an empty
BooleanQuery with no clauses.
this does not appear to be "good" behavior.
In general, QueryParser should be smarter about what it does when parsing
encountering parens whose contents result in an empty BooleanQuery -- but what
exactly it should do in the following situations...
a) +foo:BBB +()
b) +foo:BBB ()
c) +foo:BBB -()
...is up for interpretation. I would think situation (b) clearly lends itself
to dropping the sub-BooleanQuery completely. situation (c) may also lend
itself to that solution, since semanticly it means "don't allow a match on any
queries in the empty set of queries". .... I have no idea what the "right"
thing to do for situation (a) is.
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