Summary of Phrase option interactions

The three configuration settings for the Phrase module can be used in a variety of combinations for different effects.

The following matrix describes the behavior of each combination.

Subphrase	Approximate	Expansion	Description
Off	Off	Off	Default. Ranks results into two strata: those that match the user’s query as a whole phrase, and those that do not.
Off	Off	On	Ranks results into two strata: those that match the original, or an extended version, of the query as a whole phrase, and those that do not.
Off	On	Off	Ranks results into two strata: those that match the original query as a whole phrase, and those that do not. Looks only at the first possible phrase match within each record.
Off	On	On	Ranks results into two strata: those that match the original, or an extended version, of the query as a whole phrase, and those that do not. Looks only at the first possible phrase match within each record.
On	Off	Off	Ranks results into N strata, where N equals the length of the query and each result’s score equals the length of its matched subphrase.
On	Off	On	Ranks results into N strata, where N equals the length of the query and each result’s score equals the length of its matched subphrase. Extends subphrases to facilitate matching, but ranks based on the length of the original subphrase (before extension). Note that this combination can have a negative performance impact on query throughput.
On	On	Off	Ranks results into N strata, where N equals the length of the query and each result’s score equals the length of its matched subphrase. Looks only at the first possible phrase match within each record.
On	On	On	Ranks results into N strata, where N equals the length of the query and each result’s score equals the length of its matched subphrase. Expands the query to facilitate matching, but ranks based on the length of the original subphrase (before extension). Looks only at the first possible phrase match within each record.

Note: You should only use one Phrase module in any given search interface and set all of your options in it.