I experimented with the index-time only use of ReversedWildcardFilter and the
both time use.
My result shows using ReverseWildcardFilter both times runs twice as fast but my
dataset is not very large (in the order of 10k docs), so I'm not sure if I can
make a conclusion.
On 4/8/20 2:49 PM, TK Solr wrote:
In the usage example shown in ReversedWildcardFilter
<https://lucene.apache.org/solr/guide/8_3/filter-descriptions.html#reversed-wildcard-filter>
in Solr Ref Guide,
and only usage find in managed-schema to define text_general_rev, the filter
is used only for indexing.
<fieldType name="text_general_rev" class="solr.TextField"
positionIncrementGap="100">
<analyzer type="index">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.StopFilterFactory" words="stopwords.txt"
ignoreCase="true"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.ReversedWildcardFilterFactory" maxPosQuestion="2"
maxFractionAsterisk="0.33" maxPosAsterisk="3" withOriginal="true"/>
</analyzer>
<analyzer type="query">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.SynonymGraphFilterFactory" expand="true"
ignoreCase="true" synonyms="synonyms.txt"/>
<filter class="solr.StopFilterFactory" words="stopwords.txt"
ignoreCase="true"/>
<filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
</fieldType>
Is it incorrect to use the same analyzer for query like?
<fieldType name="lowercase_rev" class="solr.TextField"
positionIncrementGap="100">
<!-- Added to handle right-anchored substring match for email fields -->
<analyzer>
<tokenizer class="solr.WhitespaceTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.ReversedWildcardFilterFactory" maxPosQuestion="0"
maxFractionAsterisk="0" maxPosAsterisk="100" withOriginal="false"/>
</analyzer>
</fieldType>
In the description of filter, I see "Tokens without wildcards are not reversed."
But the wildcard appears only in the query string. How can
ReversedWildcardFilter know if the wildcard is being used
if the filter is used only at the indexing time?
TK
