Constructs an instance of QueryFilter with a single condition.
More conditions can be added after initialization.

C# |
public QueryFilter( string attributeName, QueryOperator op, List<AttributeValue> values )

- attributeName (String)
- Target attribute name
- op (QueryOperator)
- Comparison operator
- values (List<(Of <(<'AttributeValue>)>)>)
- Attributes to compare