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parent: Decision Records
nav_order: 22
---
# Remove stop words during query transformation

## Context and Problem Statement

When querying for a title of a paper, the title might contain stop words such as "a", "for", "and". Some data providers return 0 results when querying for a stop word. When transforming a query to the Lucene syntax, the default Boolean operator `and` is used. When using IEEE, this often leads to zero search results.

## Decision Drivers

* Consistent to the Google search engine
* Allow reproducible searches
* Avoid WTFs on the user's side

## Considered Options

* Remove stop words from the query
* Automatically enclose in quotes if no Boolean operator is contained

## Decision Outcome

Chosen option: "Remove stop words from the query", because comes out best.

## Pros and Cons of the Options

### Remove stop words from the query

* Good, because good search results if no Boolean operators are used
* Bad, because when using complex queries and stop words are used alone, they are silently removed

### Automatically enclose in quotes if no Boolean operator is contained

* Good, because good search results if no Boolean operators are used
* Bad, because silently leads to different results
* Bad, because inconsistent to Google behavior