[LUCY-183] Eliminate spurious "extra" query normalization

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.1.0 (incubating), 0.2.0 (incubating), 0.2.1 (incubating)
• Fix Version/s: 0.2.2 (incubating), 0.3.0 (incubating)
• Component/s: Search
• Assignee: Marvin Humphrey
• Reporter: Marvin Humphrey
• Created: 11/Oct/11 22:09
• Updated: 08/Nov/11 17:39
• Resolved: 13/Oct/11 20:33

Description

Query normalization is supposed to scale all scores uniformly by a simple
multiplier, but the child nodes in complex queries are presently getting
"extra" normalization applied to them. This has the effect of scaling
different subqueries by different amounts, changing the balance of the
subqueries within a complex query, interfering with IDF weighting and subtly
degrading relevancy.