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[7.x] Run pagination count as subquery for group by and havings #32624

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Merged
merged 4 commits into from
May 1, 2020
Merged

[7.x] Run pagination count as subquery for group by and havings #32624

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5cd7e5f
run pagination count as subquery for group by and havings
taylorotwell May 1, 2020
39cc37b
Apply fixes from StyleCI (#32623)
taylorotwell May 1, 2020
e5e8871
remove orderings and limits
taylorotwell May 1, 2020
400363f
ues clone to bind
taylorotwell May 1, 2020
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24 changes: 21 additions & 3 deletions src/Illuminate/Database/Query/Builder.php
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Original file line number Diff line number Diff line change
Expand Up @@ -2238,9 +2238,7 @@ public function getCountForPagination($columns = ['*'])
// Once we have run the pagination count query, we will get the resulting count and
// take into account what type of query it was. When there is a group by we will
// just return the count of the entire results set since that will be correct.
if (isset($this->groups)) {
return count($results);
} elseif (! isset($results[0])) {
if (! isset($results[0])) {
return 0;
} elseif (is_object($results[0])) {
return (int) $results[0]->aggregate;
Expand All @@ -2257,6 +2255,15 @@ public function getCountForPagination($columns = ['*'])
*/
protected function runPaginationCountQuery($columns = ['*'])
{
if ($this->groups || $this->havings) {
$clone = $this->cloneForPaginationCount();

return [(object) ['aggregate' => $this->newQuery()
->from(new Expression('('.$clone->toSql().') as '.$this->grammar->wrap('aggregate_table')))
->mergeBindings($clone)
->count(['*']), ]];
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Would it be faster to count the ID if there's one? instead of counting all columns?

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We don't always know which columns are actually available. There is also a difference between count(*) and count(id): https://stackoverflow.com/a/3003533/4848587

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the $columns param is being passed by not used, maybe it should be
->count($columns), ]];

}

$without = $this->unions ? ['orders', 'limit', 'offset'] : ['columns', 'orders', 'limit', 'offset'];

return $this->cloneWithout($without)
Expand All @@ -2265,6 +2272,17 @@ protected function runPaginationCountQuery($columns = ['*'])
->get()->all();
}

/**
* Clone the existing query instance for usage in a pagination subquery.
*
* @return self
*/
protected function cloneForPaginationCount()
{
return $this->cloneWithout(['orders', 'limit', 'offset'])
->cloneWithoutBindings(['order']);
}

/**
* Remove the column aliases since they will break count queries.
*
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