- TermSearcher has alternate constructor if term is []byte, this can avoid
copying in some cases. TermScorer updated to accept []byte term. Also
removed a few struct fields which were not being used.
- New MultiTermSearcher searches for documents containing any of a list of
terms. Current implementation simply uses DisjunctionSearcher.
- Several other searcher constructors now simply build a list of terms and
then delegate to the MultiTermSearcher
- NewPrefixSearcher
- NewRegexpSearcher
- NewFuzzySearcher
- NewNumericRangeSearcher
- NewGeoBoundingBoxSearcher and NewGeoPointDistanceSearcher make use of
the MultiTermSearcher internally, and follow the pattern of returning
an existing search.Searcher, as opposed to their own wrapping struct.
- Callback filter functions used in NewGeoBoundingBoxSearcher and
NewGeoPointDistanceSearcher have been extracted into separate functions
which makes the code much easier to read.
While researching an observed performance issue with wildcard
queries, it was observed that the LiteralPrefix() method on
the regexp.Regexp struct did not always behave as expected.
In particular, when the pattern starts with ^, AND involves
some backtracking, the LiteralPrefix() seems to always be the
empty string.
The side-effect of this is that we rely on having a helpful
prefix, to reduce the number of terms in the term dictionary
that need to be visited.
This change now makes the searcher enforce start/end on the term
directly, by using FindStringIndex() instead of Match().
Next, we also modified WildcardQuery and RegexpQuery to no
longer include the ^ and $ modifiers.
Documentation was also udpated to instruct users that they should
not include the ^ and $ modifiers in their patterns.
This is a change in search result behavior in that location
information is no longer provided by default with search results.
Although this looks like a wide-ranging change, it's mostly a
mechanical replacement of the explain bool flag with a new
search.SearcherOptions struct, which holds both the Explain bool flag
and the IncludeTermVectors bool flag.
