Hi Mikhail, Thank you for providing such useful information!
> Regular filter is executed and cached (if it's a case) first, then query is executed, and post-filter is checked by every doc found. >From this source, it seems that when creating a BooleanQuery by combining a scoreQuery(q parameter) and a filterQuery(fq parameter), the scoreQuery is added first, followed by the filterQuery. https://github.com/apache/solr/blob/61609b1b599b839952fe6a8f0e163254caddd472/solr/core/src/java/org/apache/solr/search/QueryUtils.java#L260 ``` return new BooleanQuery.Builder() .add(scoreQuery, Occur.MUST) .add(filterQuery, Occur.FILTER) .build(); ``` So, I have two questions here: Question 1: Does this imply that the index search with the q parameter is executed first, followed by the index search with the fq parameter? Question 2: Regardless of the processing order of index searches for the q parameter and the fq parameter, I believe that the overall search performance remains unaffected. Is this understanding correct please? > here we go > https://github.com/apache/solr/blob/61609b1b599b839952fe6a8f0e163254caddd472/solr/core/src/java/org/apache/solr/search/SolrIndexSearcher.java#L1889 This was such a helpful hint. Thank you very much. Regards, Mingchun
