this improvement was started to improve code coverage
but also improves performance and adds support for escaping
escaping:
The following quoted string enumerates the characters which
may be escaped.
"+-=&|><!(){}[]^\"~*?:\\/ "
Note that this list includes space.
In order to escape these characters, they are prefixed with the \
(backslash) character. In all cases, using the escaped version
produces the character itself and is not interpretted by the
lexer.
Two simple examples:
my\ name
Will be interpretted as a single argument to a match query
with the value "my name".
"contains a\" character"
Will be interpretted as a single argument to a phrase query
with the value `contains a " character`.
Performance:
before$ go test -v -run=xxx -bench=BenchmarkLexer
BenchmarkLexer-4 100000 13991 ns/op
PASS
ok github.com/blevesearch/bleve 1.570s
after$ go test -v -run=xxx -bench=BenchmarkLexer
BenchmarkLexer-4 500000 3387 ns/op
PASS
ok github.com/blevesearch/bleve 1.740s
parsing of date ranges in queries no longer consults the
index mapping. it was deteremined that this wasn't very useful
and led to overly complicated query syntax/behavior.
instead, applications get set the datetime parser used for
date range queries with the top-level config QueryDateTimeParser
also, we now support querying date ranges in the query string,
the syntax is:
field:>"date"
>,>=,<,<= operators are supported
the date must be surrounded by quotes
and must parse in the configured date format
you can now use terms like:
test?string*
and similar text in query strings to perform wildcard
searches. also if you use:
/aregexp/
it will perform a regexp search as well
you can do a manual fuzzy term search using the FuzzyQuery struct
or, more suitable for most users the MatchQuery now supports
some fuzzy options. Here you can specify fuzziness and
prefix_length, to turn the underlying term search into a fuzzy
term search. This has the benefit that analysis is performed
on your input, just like the analyzed field, prior to computing
the fuzzy variants.
closes#82
