Web / Apache Solr Interview questions
What is the difference between the standard query parser and DisMax?
The standard (Lucene) query parser exposes Lucene's full syntax directly: field:value pairs, boolean operators (AND, OR, NOT), wildcards, and range queries. It is powerful but unforgiving - a stray colon or unbalanced parenthesis from an end user can throw a syntax error.
| Standard parser | DisMax |
| Full Lucene syntax, error-prone for raw user input | Simplified syntax designed for direct user-typed queries |
| Searches one field unless explicitly specified | Searches multiple weighted fields via qf automatically |
DisMax takes a plain search box string, splits it into clauses, and searches it across several fields defined in qf (query fields) with per-field boosts, without letting special Lucene syntax characters break the query. It intentionally does not support full boolean logic, which is where eDisMax comes in.
Which parser is generally safer for raw, user-typed search box input?
What parameter tells DisMax which fields to search with what weights?
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