Improve issue search (#2387)

* Improve issue indexer

* Fix new issue sqlite bug

* Different test indexer paths for each db

* Add integration indexer paths to make clean

vendor/github.com/blevesearch/bleve/search/query/term_range.go

@@ -0,0 +1,95 @@
+//  Copyright (c) 2017 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package query
+
+import (
+	"fmt"
+
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/mapping"
+	"github.com/blevesearch/bleve/search"
+	"github.com/blevesearch/bleve/search/searcher"
+)
+
+type TermRangeQuery struct {
+	Min          string `json:"min,omitempty"`
+	Max          string `json:"max,omitempty"`
+	InclusiveMin *bool  `json:"inclusive_min,omitempty"`
+	InclusiveMax *bool  `json:"inclusive_max,omitempty"`
+	FieldVal     string `json:"field,omitempty"`
+	BoostVal     *Boost `json:"boost,omitempty"`
+}
+
+// NewTermRangeQuery creates a new Query for ranges
+// of text term values.
+// Either, but not both endpoints can be nil.
+// The minimum value is inclusive.
+// The maximum value is exclusive.
+func NewTermRangeQuery(min, max string) *TermRangeQuery {
+	return NewTermRangeInclusiveQuery(min, max, nil, nil)
+}
+
+// NewTermRangeInclusiveQuery creates a new Query for ranges
+// of numeric values.
+// Either, but not both endpoints can be nil.
+// Control endpoint inclusion with inclusiveMin, inclusiveMax.
+func NewTermRangeInclusiveQuery(min, max string, minInclusive, maxInclusive *bool) *TermRangeQuery {
+	return &TermRangeQuery{
+		Min:          min,
+		Max:          max,
+		InclusiveMin: minInclusive,
+		InclusiveMax: maxInclusive,
+	}
+}
+
+func (q *TermRangeQuery) SetBoost(b float64) {
+	boost := Boost(b)
+	q.BoostVal = &boost
+}
+
+func (q *TermRangeQuery) Boost() float64 {
+	return q.BoostVal.Value()
+}
+
+func (q *TermRangeQuery) SetField(f string) {
+	q.FieldVal = f
+}
+
+func (q *TermRangeQuery) Field() string {
+	return q.FieldVal
+}
+
+func (q *TermRangeQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, options search.SearcherOptions) (search.Searcher, error) {
+	field := q.FieldVal
+	if q.FieldVal == "" {
+		field = m.DefaultSearchField()
+	}
+	var minTerm []byte
+	if q.Min != "" {
+		minTerm = []byte(q.Min)
+	}
+	var maxTerm []byte
+	if q.Max != "" {
+		maxTerm = []byte(q.Max)
+	}
+	return searcher.NewTermRangeSearcher(i, minTerm, maxTerm, q.InclusiveMin, q.InclusiveMax, field, q.BoostVal.Value(), options)
+}
+
+func (q *TermRangeQuery) Validate() error {
+	if q.Min == "" && q.Min == q.Max {
+		return fmt.Errorf("term range query must specify min or max")
+	}
+	return nil
+}