Fix SpanOrQuery scores each document using the combined IDF of all causes#15819
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gaobinlong wants to merge 1 commit intoapache:mainfrom
Open
Fix SpanOrQuery scores each document using the combined IDF of all causes#15819gaobinlong wants to merge 1 commit intoapache:mainfrom
gaobinlong wants to merge 1 commit intoapache:mainfrom
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…auses rather than the matched clauses Signed-off-by: Binlong Gao <gbinlong@amazon.com>
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Description
Resolves #13796.
Fix SpanOrQuery scores each document not using only the IDF of the term that matched, but the combined IDF of all clauses. With two docs (foo:bar, foo:baz) and a spanOr([foo:bar, foo:baz]) query, each doc should score the same as the equivalent bool-should query (i.e.single-term IDF, not summed IDF). Compare the result in OpenSearch as follows:
With bool-should query, idf for doc (foo:bar) is 0.6931472
With SpanOr query, idf for doc (foo:bar) is 1.3862944 which is 0.6931472 + 0.6931472
