On 29-Oct-07, at 9:43 AM, Paul Elschot wrote:
On Friday 26 October 2007 09:36:58 Ard Schrijvers wrote:
+prop1:a +prop2:b +prop3:c +prop4:d +prop5:e
is much faster than
(+(+(+(+prop1:a +prop2:b) +prop3:c) +prop4:d) +prop5:e)
where the second one is a result from BooleanQuery in
BooleanQuery, and
all have Occur.MUST.
SImplifying boolean queries like this is not available in Lucene,
but it
would have a positive effect on search performance, especially when
prop1:a and prop2:b have a high document frequency.
Wait--shouldn't the outer-most BooleanQuery provide most of this
speedup already (since it should be skipTo'ing between the nested
BooleanQueries and the outermost). Is it the indirection and sub-
query management that is causing the performance difference, or
differences in skiptTo behaviour?
-Mike
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