Google Cloud Datastore - Different results of query by Kind and query by GQL - google-cloud-datastore

Question

I have 2 types of query, by Kind and by GQL
$query = $datastore
->query()
->kind('files')
->filter('tags','=','texture')
->filter('tags','=','newspaper')
->start($pageCursor);
This gives more results than GQL query:
$query = $datastore
->gqlQuery
("SELECT *
FROM files
where tags='texture' and tags='newspaper'",
['allowLiterals' => true]
);
Why are their results not the same?
My results of query by Kind: https://drive.google.com/open?id=1r-Tonqs1ld4bKo0woIcR_UrMUTc1em0D
If I use query by GQL, only 4 results are found
Update
You can follow this topic: https://github.com/googleapis/google-cloud-php/issues/1696

Answer 1

It is very difficult to find your error without seeing your code, try to provide more details in your next questions.
I have used your example and all works as expected. The output of this script is:
Query by kind retrieves 19 results
Query by GQL retrieves 19 results
#!/usr/bin/env php
<?php
require __DIR__ . '/vendor/autoload.php';
# Imports the Google Cloud client library
use Google\Cloud\Datastore\DatastoreClient;
# Your Google Cloud Platform project ID
$projectId = 'YOUR-PROJECT-ID';
$datastore = new DatastoreClient([
'projectId' => $projectId
]);
$titles = ['man sitting near door', 'way reading paper', 'scattered magazines', 'grayscale ', 'photography of kanji text', 'texture: vintage newspaper', 'wall floor recycle light simple', 'old newspaper texture', 'Mockup Old Paper Color ', 'Mockup Journal.', 'Old Newspaper Texture', 'Triangle Geometric Graphic Pattern Template', 'paperboard carton surface beige plain', 'paperboard simple fiber dusty texture', 'Designer Workspace', 'craft texture brown journal note', 'Brown texture', 'Newspaper collage texture', 'Texture Newspaper'];
$tags = ['newspaper, texture, space for copy, space, cover, white, textured, antique, text, press, write, worn, backdrop, surface, old, scratch, brown, ancient, light, background, vintage, effect, letter, space for text, template, blank, rough, color, line, book, pattern, stain, paper, design, copy, dirty, grunge, copyspace, aged, retro, banner, abstract, message, print, smudge, material, grungy, wooden, wall, age, chinese, china, chinese newspaper',
'world, war, newspaper, texture, history, grunge, pattern, american, war, battle', 'basket, yellow building, shop, colour, wallpaper, texture, misc, wallpaper, urban, bicycle, morning, sidewalk, asian, newspaper, yellow, street, bike, man, tree, china, bycicle',
'man, boy, male, card, paper, decoration, woman, child, smile, torn, wall, paper, poster, texture, old, affiche wall advert wallpaper portugal wall poster erosion used print urban, newspaper',
'white, cloud, house, bw, black and white, pattern, light, street, silhouette, texture, calligraphy, composition, japanese, japan, newspaper, character, wall, wall paper, wall art, poster, black and white, png images',
'newspaper, texture, space for copy, space, cover, white, textured, antique, text, press, write, worn, backdrop, surface, old, scratch, brown, ancient, light, background, vintage, effect, letter, space for text, template, blank, rough, color, line, book, pattern, stain, paper, design, copy, dirty, grunge, copyspace, aged, retro, banner, abstract, message, print, smudge, material, grungy, wooden, wall, vintage newspaper',
'background, pattern, vintage, texture, paper, light, space, grunge, wall, note, flat, old paper, paper texture, desk, newspaper, recycle, natural, document, nature background, clean',
'newspaper, texture, space for copy, space, cover, white, textured, antique, text, press, write, worn, backdrop, surface, old, scratch, brown, ancient, light, background, vintage, effect, letter, space for text, template, blank, rough, color, line, book, pattern, stain, paper, design, copy, dirty, grunge, copyspace, aged, retro, banner, abstract, message, print, smudge, material, grungy, wooden, wall, age, old paper',
'newspaper, cut, paper, kraft, cardboard, mockup, old, slip, ad, advertisement, advertising, ancient, announcement, antique, backdrop, background, banner, blank, border, card, christmas, communication, design, dirty, edge, empty, grunge, illustration, information, label, letter, message, note, page, parchment, pattern, poster, red, ripped, shadow, sticker, tag, template, texture, torn, vector, vintage, wallpaper, web, white',
'leather, magazine, mockup, book, black, spread, page, double, brochure, blank, reading, journal, template, a4, holding, hand, newspaper, front, leaflet, person, back, binding, softcover, big, pamphlet, album, business, clear, dark, design, desk, display, document, glossy, grey, hard, hardcover, layout, ledger, mag, mock up, news, opened, paper, paperback, print, sheet, showing, soft, text, texture',
'newspaper, texture, space for copy, space, cover, white, textured, antique, text, press, write, worn, backdrop, surface, old, scratch, brown, ancient, light, background, vintage, effect, letter, space for text, template, blank, rough, color, line, book, pattern, stain, paper, design, copy, dirty, grunge, copyspace, aged, retro, banner, abstract, message, print, smudge, material, grungy, wooden, wall, age',
'pattern, people, texture, template, geometric, paint, home, triangle, geometric pattern, graphic, kid, child, square, bag, person, paper texture, window, creative, newspaper, plants',
'background, pattern, vintage, texture, paper, light, space, grunge, wall, note, flat, old paper, paper texture, desk, newspaper, recycle, natural, document, nature background, clean',
'background, pattern, vintage, texture, paper, light, space, grunge, wall, note, flat, old paper, paper texture, desk, newspaper, recycle, natural, document, nature background, clean',
'designer, table, workspace, computer, flat, object, workstation, desktop, design, work, office, home, desk, display, lamp, concept, cup, decor, modern, illustration, monitor, interior, inside, house, education, job, book, coffee, business, light, style, background, graphic, workplace, icons, symbol, elements, equipment, emblem, lifestyle, place, decorative, collection, room, set, organization, stylish, freelance, notepad, creative, jobs, creativity, mug, email, view, bulb, tablet, notebook, top, wood, number, texture, newspaper, think, paper, talk, bubble, mock-up, speech, item, media, template, idea, management, mock, project, mail, infographic, connect, wooden, chat, icon, content, pc, space, minimalism, vector, technology, web, screen, website, white, corporate, decorated, mouse, internet, process, clock',
'background, pattern, vintage, texture, paper, light, space, grunge, wall, note, flat, old paper, paper texture, desk, newspaper, recycle, natural, document, nature background, clean',
'pattern, vintage, texture, paper, light, space, grunge, wall, note, flat, old paper, paper texture, desk, newspaper, vintage pattern, recycle, natural, document, clean, floor',
'newspaper, texture, collage, news, old, background, text, book',
'newspaper, texture, space for copy, space, cover, white, textured, antique, text, press, write, worn, backdrop, surface, old, scratch, brown, ancient, light, background, vintage, effect, letter, space for text, template, blank, rough, color, line, book, pattern, stain, paper, design, copy, dirty, grunge, copyspace, aged, retro, banner, abstract, message, print, smudge, material, grungy, wooden, wall'];
$i = 0;
foreach ($titles as $title){
$entity = $datastore->entity('Examples');
$entity['title'] = $title;
$entity['tags'] = explode(", ", $tags[$i]);
$datastore->insert($entity);
$i = $i + 1;
}
sleep(1);
$query = $datastore
->query()
->kind('Examples')
->filter('tags','=','texture')
->filter('tags','=','newspaper');
$results = $datastore->runQuery($query);
$count = 0;
foreach ($results as $res) {
$count++;
}
echo 'Query by kind retrieves ', $count, ' results', PHP_EOL ;
$query = $datastore
->gqlQuery
("SELECT *
FROM Examples
where tags='texture' and tags='newspaper'",
['allowLiterals' => true]
);
$results = $datastore->runQuery($query);
$count = 0;
foreach ($results as $res) {
$count++;
}
echo 'Query by GQL retrieves ' ,$count, ' results', PHP_EOL;