[5.7] Fix UNION aggregate queries with columns

src/Illuminate/Database/Query/Builder.php

@@ -2130,8 +2130,10 @@ public function getCountForPagination($columns = ['*'])
      */
     protected function runPaginationCountQuery($columns = ['*'])
     {
-        return $this->cloneWithout(['columns', 'orders', 'limit', 'offset'])
-                    ->cloneWithoutBindings(['select', 'order'])
+        $without = $this->unions ? ['orders', 'limit', 'offset'] : ['columns', 'orders', 'limit', 'offset'];
+
+        return $this->cloneWithout($without)
+                    ->cloneWithoutBindings($this->unions ? ['order'] : ['select', 'order'])
                     ->setAggregate('count', $this->withoutSelectAliases($columns))
                     ->get()->all();
     }
@@ -2444,8 +2446,8 @@ public function average($column)
      */
     public function aggregate($function, $columns = ['*'])
     {
-        $results = $this->cloneWithout(['columns'])
-                        ->cloneWithoutBindings(['select'])
+        $results = $this->cloneWithout($this->unions ? [] : ['columns'])
+                        ->cloneWithoutBindings($this->unions ? [] : ['select'])
                         ->setAggregate($function, $columns)
                         ->get($columns);
 

tests/Database/DatabaseQueryBuilderTest.php

@@ -843,6 +843,12 @@ public function testUnionAggregate()
         $builder->getProcessor()->shouldReceive('processSelect')->once();
         $builder->from('posts')->union($this->getMySqlBuilder()->from('videos'))->count();
 
+        $expected = 'select count(*) as aggregate from ((select `id` from `posts`) union (select `id` from `videos`)) as `temp_table`';
+        $builder = $this->getMySqlBuilder();
+        $builder->getConnection()->shouldReceive('select')->once()->with($expected, [], true);
+        $builder->getProcessor()->shouldReceive('processSelect')->once();
+        $builder->from('posts')->select('id')->union($this->getMySqlBuilder()->from('videos')->select('id'))->count();
+
         $expected = 'select count(*) as aggregate from (select * from "posts" union select * from "videos") as "temp_table"';
         $builder = $this->getPostgresBuilder();
         $builder->getConnection()->shouldReceive('select')->once()->with($expected, [], true);
@@ -1095,6 +1101,20 @@ public function testGetCountForPaginationWithColumnAliases()
         $this->assertEquals(1, $count);
     }
 
+    public function testGetCountForPaginationWithUnion()
+    {
+        $builder = $this->getBuilder();
+        $builder->from('posts')->select('id')->union($this->getBuilder()->from('videos')->select('id'));
+
+        $builder->getConnection()->shouldReceive('select')->once()->with('select count(*) as aggregate from (select "id" from "posts" union select "id" from "videos") as "temp_table"', [], true)->andReturn([['aggregate' => 1]]);
+        $builder->getProcessor()->shouldReceive('processSelect')->once()->andReturnUsing(function ($builder, $results) {
+            return $results;
+        });
+
+        $count = $builder->getCountForPagination();
+        $this->assertEquals(1, $count);
+    }
+
     public function testWhereShortcut()
     {
         $builder = $this->getBuilder();