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From Marvin Humphrey <>
Subject Re: [lucy-user] ClusterSearcher returns zero results if negate operator used
Date Tue, 29 Nov 2011 13:52:36 GMT
On Tue, Nov 29, 2011 at 12:17:12PM +0200, goran kent wrote:
> I haven't ruled out something stupid on my part yet, but I've found
> that a query with a negate operator:
> [term1 -term2]
> or even
> [term1 -gobbledegoek-asdkjhdadakd823asdkb]
> when pumping through ClusterSearcher, always returns zero results.  If
> using a standard PolySearcher on a local index, then it works as
> expected.

Can you please try the following for both ClusterSearcher and PolySearcher?

First, derive a query object from your query string.  If you are using a
QueryParser, it's this...

    my $query = $query_parser->parse("term1 -term2");

... otherwise, it's this:

    my $query = $searcher->glean_query("term1 -term2");

Then let's examine the parsed queries to ensure that they are the same:

    use Data::Dumper;
    warn Dumper($query->dump);

If the parsed queries differ, that is probably because the Schema being fed to
ClusterSearcher's constructor is incomplete or wrong -- for instance, there
may be fields on the remote nodes that ClusterSearcher doesn't know about.
Currently, ClusterSearcher does not enforce schema completeness or
compatibility for its child nodes; that should be added in the future.

If the parsed queries are the same, there is presumably something amiss with
the search logic and we'll need to debug.

Marvin Humphrey

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