bleve/search/searchers/search_disjunction_test.go

//  Copyright (c) 2014 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 searchers

import (
	"testing"

	"github.com/blevesearch/bleve/index/upside_down"
	"github.com/blevesearch/bleve/search"
)

func TestDisjunctionSearch(t *testing.T) {

	twoDocIndexReader, err := twoDocIndex.Reader()
	if err != nil {
		t.Error(err)
	}
	defer func() {
		err := twoDocIndexReader.Close()
		if err != nil {
			t.Fatal(err)
		}
	}()

	martyTermSearcher, err := NewTermSearcher(twoDocIndexReader, "marty", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	dustinTermSearcher, err := NewTermSearcher(twoDocIndexReader, "dustin", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	martyOrDustinSearcher, err := NewDisjunctionSearcher(twoDocIndexReader, []search.Searcher{martyTermSearcher, dustinTermSearcher}, 0, true)
	if err != nil {
		t.Fatal(err)
	}

	martyTermSearcher2, err := NewTermSearcher(twoDocIndexReader, "marty", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	dustinTermSearcher2, err := NewTermSearcher(twoDocIndexReader, "dustin", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	martyOrDustinSearcher2, err := NewDisjunctionSearcher(twoDocIndexReader, []search.Searcher{martyTermSearcher2, dustinTermSearcher2}, 0, true)
	if err != nil {
		t.Fatal(err)
	}

	raviTermSearcher, err := NewTermSearcher(twoDocIndexReader, "ravi", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	nestedRaviOrMartyOrDustinSearcher, err := NewDisjunctionSearcher(twoDocIndexReader, []search.Searcher{raviTermSearcher, martyOrDustinSearcher2}, 0, true)
	if err != nil {
		t.Fatal(err)
	}

	tests := []struct {
		searcher search.Searcher
		results  []*search.DocumentMatchInternal
	}{
		{
			searcher: martyOrDustinSearcher,
			results: []*search.DocumentMatchInternal{
				{
					ID:    upside_down.InternalId("1"),
					Score: 0.6775110856165737,
				},
				{
					ID:    upside_down.InternalId("3"),
					Score: 0.6775110856165737,
				},
			},
		},
		// test a nested disjunction
		{
			searcher: nestedRaviOrMartyOrDustinSearcher,
			results: []*search.DocumentMatchInternal{
				{
					ID:    upside_down.InternalId("1"),
					Score: 0.2765927424732821,
				},
				{
					ID:    upside_down.InternalId("3"),
					Score: 0.2765927424732821,
				},
				{
					ID:    upside_down.InternalId("4"),
					Score: 0.5531854849465642,
				},
			},
		},
	}

	for testIndex, test := range tests {
		defer func() {
			err := test.searcher.Close()
			if err != nil {
				t.Fatal(err)
			}
		}()

		next, err := test.searcher.Next(nil)
		i := 0
		for err == nil && next != nil {
			if i < len(test.results) {
				if !next.ID.Equals(test.results[i].ID) {
					t.Errorf("expected result %d to have id %s got %s for test %d", i, test.results[i].ID, next.ID, testIndex)
				}
				if !scoresCloseEnough(next.Score, test.results[i].Score) {
					t.Errorf("expected result %d to have score %v got  %v for test %d", i, test.results[i].Score, next.Score, testIndex)
					t.Logf("scoring explanation: %s", next.Expl)
				}
			}
			next, err = test.searcher.Next(nil)
			i++
		}
		if err != nil {
			t.Fatalf("error iterating searcher: %v for test %d", err, testIndex)
		}
		if len(test.results) != i {
			t.Errorf("expected %d results got %d for test %d", len(test.results), i, testIndex)
		}
	}
}

func TestDisjunctionAdvance(t *testing.T) {

	twoDocIndexReader, err := twoDocIndex.Reader()
	if err != nil {
		t.Error(err)
	}
	defer func() {
		err := twoDocIndexReader.Close()
		if err != nil {
			t.Fatal(err)
		}
	}()

	martyTermSearcher, err := NewTermSearcher(twoDocIndexReader, "marty", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	dustinTermSearcher, err := NewTermSearcher(twoDocIndexReader, "dustin", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	martyOrDustinSearcher, err := NewDisjunctionSearcher(twoDocIndexReader, []search.Searcher{martyTermSearcher, dustinTermSearcher}, 0, true)
	if err != nil {
		t.Fatal(err)
	}

	match, err := martyOrDustinSearcher.Advance(upside_down.InternalId("3"), nil)
	if err != nil {
		t.Errorf("unexpected error: %v", err)
	}
	if match == nil {
		t.Errorf("expected 3, got nil")
	}
}

func TestDisjunctionSearchTooMany(t *testing.T) {

	// set to max to a low non-zero value
	DisjunctionMaxClauseCount = 2
	defer func() {
		// reset it after the test
		DisjunctionMaxClauseCount = 0
	}()

	twoDocIndexReader, err := twoDocIndex.Reader()
	if err != nil {
		t.Error(err)
	}
	defer func() {
		err := twoDocIndexReader.Close()
		if err != nil {
			t.Fatal(err)
		}
	}()

	martyTermSearcher, err := NewTermSearcher(twoDocIndexReader, "marty", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	dustinTermSearcher, err := NewTermSearcher(twoDocIndexReader, "dustin", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	steveTermSearcher, err := NewTermSearcher(twoDocIndexReader, "steve", "name", 1.0, true)
	if err != nil {
		t.Fatal(err)
	}
	_, err = NewDisjunctionSearcher(twoDocIndexReader, []search.Searcher{martyTermSearcher, dustinTermSearcher, steveTermSearcher}, 0, true)
	if err == nil {
		t.Fatal(err)
	}
}