Lucy::Index::DeletionsWriter(3pm)

Usage

    my $polyreader  = $del_writer->get_polyreader;
    my $seg_readers = $polyreader->seg_readers;
    for my $seg_reader (@$seg_readers) {
        my $count = $del_writer->seg_del_count( $seg_reader->get_seg_name );
        ...
    }

Overview

Subclasses of DeletionsWriter provide a low-level mechanism for declaring a document deleted from an index.

Because files in an index are never modified, and because it is not practical to delete entire segments, a DeletionsWriter does not actually remove documents from the index. Instead, it communicates to a search-time companion DeletionsReader which documents are deleted in such a way that it can create a Matcher iterator.

Documents are truly deleted only when the segments which contain them are merged into new ones.

Abstract methods

delete_by_term( [labeled params] )

Delete all documents in the index that index the supplied term.

•: field - The name of an indexed field. (If it is not spec'd as "indexed", an error will occur.)

•: term - The term which identifies docs to be marked as deleted. If "field" is associated with an Analyzer, "term" will be processed automatically (so don't pre-process it yourself).

delete_by_query(query)

Delete all documents in the index that match "query".

•: query - A Query.

updated()

Returns true if there are updates that need to be written.

seg_del_count(seg_name)

Return the number of deletions for a given segment.

•: seg_name - The name of the segment.

Inheritance

Lucy::Index::DeletionsWriter isa Lucy::Index::DataWriter isa Lucy::Object::Obj.

Releases

2 releases since Debian 8 (Jessie); the text changed 1 time.

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