1Lucy::Index::DeletionsWUrsietrerC(o3n)tributed Perl DocuLmuecnyt:a:tIinodnex::DeletionsWriter(3)
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NAME

6       Lucy::Index::DeletionsWriter - Abstract base class for marking
7       documents as deleted.
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SYNOPSIS

10           my $polyreader  = $del_writer->get_polyreader;
11           my $seg_readers = $polyreader->seg_readers;
12           for my $seg_reader (@$seg_readers) {
13               my $count = $del_writer->seg_del_count( $seg_reader->get_seg_name );
14               ...
15           }
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DESCRIPTION

18       Subclasses of DeletionsWriter provide a low-level mechanism for
19       declaring a document deleted from an index.
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21       Because files in an index are never modified, and because it is not
22       practical to delete entire segments, a DeletionsWriter does not
23       actually remove documents from the index.  Instead, it communicates to
24       a search-time companion DeletionsReader which documents are deleted in
25       such a way that it can create a Matcher iterator.
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27       Documents are truly deleted only when the segments which contain them
28       are merged into new ones.
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ABSTRACT METHODS

31   delete_by_term
32           $deletions_writer->delete_by_term(
33               field => $field,  # required
34               term  => $term,   # required
35           );
36
37       Delete all documents in the index that index the supplied term.
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39       ·   field - The name of an indexed field. (If it is not specXd as
40           "indexed", an error will occur.)
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42       ·   term - The term which identifies docs to be marked as deleted.  If
43           "field" is associated with an Analyzer, "term" will be processed
44           automatically (so donXt pre-process it yourself).
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46   delete_by_query
47           $deletions_writer->delete_by_query($query);
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49       Delete all documents in the index that match "query".
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51       ·   query - A Query.
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53   updated
54           my $bool = $deletions_writer->updated();
55
56       Returns true if there are updates that need to be written.
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58   seg_del_count
59           my $int = $deletions_writer->seg_del_count($seg_name);
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61       Return the number of deletions for a given segment.
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63       ·   seg_name - The name of the segment.
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INHERITANCE

66       Lucy::Index::DeletionsWriter isa Lucy::Index::DataWriter isa
67       Clownfish::Obj.
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71perl v5.28.0                      2018-07-14   Lucy::Index::DeletionsWriter(3)
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