[KinoSearch] Using multiple analyzers

[Adam .]

Hi there,

I'm running v0.15. I want to make use of multiple (2) analyzers, so
that I can benefit from stemming and stop-words for some fields (as
default behaviour), whilst benefiting from 'exact matches' in other
fields (by not stemming). I have the following code in my 'build
index' script :

#---

# The default analyzer.
my $stemmed_analyzer = KinoSearch::Analysis::PolyAnalyzer->new(
  analyzers => [
    KinoSearch::Analysis::LCNormalizer->new( language => 'en' ),
    KinoSearch::Analysis::Tokenizer->new( language => 'en' ),
    KinoSearch::Analysis::Stopalizer->new( language => 'en' ),
    KinoSearch::Analysis::Stemmer->new( language => 'en' )
  ]
);

my $unstemmed_analyzer = KinoSearch::Analysis::PolyAnalyzer->new(
  analyzers => [
    KinoSearch::Analysis::LCNormalizer->new( language => 'en' ),
    KinoSearch::Analysis::Tokenizer->new( language => 'en' ),
  ]
);

my $inv_indexer = KinoSearch::InvIndexer->new(
  invindex => $index_dir,
  analyzer => $stemmed_analyzer,
  create => 1,
);

$inv_indexer->spec_field(
  name => 'title',
);

$inv_indexer->spec_field(
  name => 'title_unstemmed',
  analyzer => $unstemmed_analyzer,
  boost => 2,
);

$inv_indexer->spec_field(
  name => 'content',
);

#---


In my 'search' script, I am using the following :

#---

my $stemmed_analyzer = KinoSearch::Analysis::PolyAnalyzer->new(
  analyzers => [
    KinoSearch::Analysis::LCNormalizer->new( language => 'en' ),
    KinoSearch::Analysis::Tokenizer->new( language => 'en' ),
    KinoSearch::Analysis::Stopalizer->new( language => 'en' ),
    KinoSearch::Analysis::Stemmer->new( language => 'en' )
  ]
);

my $query_parser = KinoSearch::QueryParser::QueryParser->new(
  analyzer => $stemmed_analyzer,
  fields => [ qw/ title title_unstemmed content / ],
  default_boolop => 'AND',
);

#---

How do I tell it to use the unstemmed analyzer for the title_unstemmed
field? The docs emphasize the importance of using the same analyzer in
both stages (build and search) but I cannot seem to do that as
QueryParser can only take one analyzer.

Thanks,

Adam

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