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Remove build_ugly_search_querylet

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now that the accurate search doesn't use subqueries, perhaps mysql can
accept it
This commit is contained in:
Shish 2019-07-07 16:50:55 +01:00
parent bd5ccd2800
commit ea802f4a24
1 changed files with 1 additions and 88 deletions
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89
core/imageboard/image.php
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@ -907,11 +907,7 @@ class Image
// more than one positive tag, or more than zero negative tags
else {
if ($database->get_driver_name() === DatabaseDriver::MYSQL) {
$query = Image::build_ugly_search_querylet($tag_conditions);
} else {
$query = Image::build_accurate_search_querylet($tag_conditions);
}
$query = Image::build_accurate_search_querylet($tag_conditions);
}
/*
@ -1036,89 +1032,6 @@ class Image
throw new SCoreException("No criteria specified");
}
//throw new SCoreException($sql);
return new Querylet($sql);
}
/**
* this function exists because mysql is a turd, see the docs for
* build_accurate_search_querylet() for a full explanation
*
* #param TagQuerylet[] $tag_conditions
*/
private static function build_ugly_search_querylet(array $tag_conditions): Querylet
{
global $database;
$positive_tag_count = 0;
foreach ($tag_conditions as $tq) {
if ($tq->positive) {
$positive_tag_count++;
}
}
// only negative tags - shortcut to fail
if ($positive_tag_count == 0) {
// TODO: This isn't currently implemented.
// SEE: https://github.com/shish/shimmie2/issues/66
return new Querylet("
SELECT images.*
FROM images
WHERE 1=0
");
}
// merge all the tag querylets into one generic one
$sql = "0";
$terms = [];
foreach ($tag_conditions as $tq) {
$sign = $tq->positive ? "+" : "-";
$sql .= ' '.$sign.' IF(SUM(tag LIKE :tag'.Image::$tag_n.'), 1, 0)';
$terms['tag'.Image::$tag_n] = Tag::sqlify($tq->tag);
Image::$tag_n++;
}
$tag_search = new Querylet($sql, $terms);
$tag_id_array = [];
foreach ($tag_conditions as $tq) {
$tag_ids = $database->get_col(
$database->scoreql_to_sql("
SELECT id
FROM tags
WHERE SCORE_STRNORM(tag) LIKE SCORE_STRNORM(:tag)
"),
["tag" => Tag::sqlify($tq->tag)]
);
$tag_id_array = array_merge($tag_id_array, $tag_ids);
if ($tq->positive && count($tag_ids) == 0) {
# one of the positive tags had zero results, therefor there
# can be no results; "where 1=0" should shortcut things
return new Querylet("
SELECT images.*
FROM images
WHERE 1=0
");
}
}
Image::$tag_n = 0;
return new Querylet('
SELECT *
FROM (
SELECT images.*, ('.$tag_search->sql.') AS score
FROM images
LEFT JOIN image_tags ON image_tags.image_id = images.id
JOIN tags ON image_tags.tag_id = tags.id
WHERE tags.id IN (' . join(', ', $tag_id_array) . ')
GROUP BY images.id
HAVING score = :score
) AS images
WHERE 1=1
', array_merge(
$tag_search->variables,
["score"=>$positive_tag_count]
));
}
}