[LUCENE-446] search.function - (1) score based on field value, (2) simple score customizability

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.2
• Component/s: core/search
• Lucene Fields: Patch Available
• Assignee: Doron Cohen
• Reporter: Yonik Seeley
• Created: 05/Oct/05 05:23
• Updated: 28/Aug/22 11:23
• Resolved: 05/Jun/07 16:39

Description

FunctionQuery can return a score based on a field's value or on it's ordinal value.

FunctionFactory subclasses define the details of the function. There is currently a LinearFloatFunction (a line specified by slope and intercept).

Field values are typically obtained from FieldValueSourceFactory. Implementations include FloatFieldSource, IntFieldSource, and OrdFieldSource.

Issue Links

• is related to: LUCENE-850 Easily create queries that transform subquery scores arbitrarily
• relates to: SOLR-192 Move FunctionQuery to Lucene