SpanNearQuery inconsistency: should it accept less than 2 clauses or not?
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Key: LUCENE-2577
URL: https://issues.apache.org/jira/browse/LUCENE-2577
Project: Lucene - Java
Issue Type: Bug
Components: Search
Affects Versions: 3.0.2
Reporter: Santiago M. Mola
NearSpansOrdered's constructor will throw an IllegalArgumentException
if less than 2 clauses are given, while NearSpansOrdered won't.
On the other hand, SpanNearQuery accepts less than 2 clauses and has explicit
optimization for 0-caluse and 1-clause queries in getSpans() method.
So, should SpanNearQuery accept less than 2 clauses or not?
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