On Jul 11, 2005, at 1:45 AM, [EMAIL PROTECTED] wrote:
Did a google serach on the problem when using the range search
phrase of "+datefield:[199801 TO 200512]" (date stored as
"YYYYMMDD") which returns 1 million hits.
error: org.apache.lucene.search.BooleanQuery$TooManyClauses
Adding "-Dorg.apache.lucene.maxClauseCount=2400" to java option
allowed the search query to run without error. The actual value
needed is between 2300 and 2400. At 2300 the query fails.
My question is how does Lucene perform range query? As a bunch of
smaller boolean queries? How does one estimate the number of
clauses required for a general query and more specifically on a
range query?
RangeQuery expands under the covers to a BooleanQuery with all
matching terms OR'd together.
In your case, if you've indexed a term for every day in that range
using YYYYMMDD then you've got 2,524 terms roughly = 7 * 365 - 31
(minus 31 because you'd omit December '05 since you are only going to
200512). If all you need is YYYYMM range searching, then index it as
that (that'd be 7 years * 12 months/year = 84 terms).
Erik
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