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From Anjana Sarkar <anjana...@gmail.com>
Subject Prefix Query for autocomplete - TooManyClauses
Date Fri, 13 Nov 2009 13:50:38 GMT
We are using lucene for one our projects here and has been working very well
for last 2 years.
The new requirement is to use it for autocomplete. Here , queries like a* or
ab* pose a problem.
I have set BooleanQuery.setMaxClauseCount( Integer.MAX_VALUE ) to get around
the TooManyClausesException.
The issue now is performance is not acceptable. It takes about 3 secs for a*
query to return results.
I have 250,000 documents , each document is 5 - 15 words in the indexed
field and am using StandardAnalyzer. I have tried using a filter,
since in this case, I am only interested in documents with a boost higher
than a certain number. I had
the boost value as a separate lucene indexed field so I can filter on it.
I realized that the filtering is only applied after the boolean query is
prepared and scored, so there is no performance benefit with using that
approach.
I cannot use a ConstantScoreQuery as I need the top n matches for the query.
Any suggestions on how I can get around this issue will be highly
appreciated.

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