Hi Jimi,
taking a look to the *maxQueryFrequency* param :
Your understanding is correct.
1) we don't provide misspelled suggestions if we set the param to 1, and we
have a minimum of 1 doc freq for the term .
2) we don't provide misspelled suggestions if the doc frequency of the term
is greater than the max limit set.
Let us explore the code :
if (suggestMode==SuggestMode.SUGGEST_WHEN_NOT_IN_INDEX && docfreq > 0) {
return new SuggestWord[0];
}
/// If we are working in "Not in Index Mode" , with a document frequency >0
we get no misspelled corrections.
/
int maxDoc = ir.maxDoc();
if (maxQueryFrequency >= 1f && docfreq > maxQueryFrequency) {
return new SuggestWord[0];
} else if (docfreq > (int) Math.ceil(maxQueryFrequency * (float)maxDoc))
{
return new SuggestWord[0];
}
// then the MaxQueryFrequency as you correctly stated enters the game
...
Let's explore how you can end up in the first scenario :
if (maxResultsForSuggest == null || hits <= maxResultsForSuggest) {
SuggestMode suggestMode = SuggestMode.SUGGEST_WHEN_NOT_IN_INDEX;
if (onlyMorePopular) {
suggestMode = SuggestMode.SUGGEST_MORE_POPULAR;
} else if (alternativeTermCount > 0) {
suggestMode = SuggestMode.SUGGEST_ALWAYS;
}
You did not set maxResultsForSuggest ( and not onlyMorePopular or
alternative term count) so you ended up in :
SuggestMode suggestMode = SuggestMode.SUGGEST_WHEN_NOT_IN_INDEX;
>From Solr javaDoc :
If left unspecified, the default behavior will prevail. That is,
"correctlySpelled" will be false and suggestions
* will be returned only if one or more of the query terms are absent from
the dictionary and/or index. If set to zero,
* the "correctlySpelled" flag will be false only if the response returns
zero hits. If set to a value greater than zero,
* suggestions will be returned even if hits are returned (up to the
specified number). This number also will serve as
* the threshold in determining the value of "correctlySpelled".
Specifying a value greater than zero is useful
* for creating "did-you-mean" suggestions for queries that return a low
number of hits.
* </p>
*/
public static final String SPELLCHECK_MAX_RESULTS_FOR_SUGGEST =
SPELLCHECK_PREFIX + "maxResultsForSuggest";
You probably want to bypass the other parameters and just set the proper
maxResultsForSuggest param for your spellchecker
Cheers
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