Fixed WhereNull and WhereNotNull for raw expressions (#92)

* Fixed WhereNull and WhereNotNull for raw expressions

---------

Co-authored-by: AdalbertMemSQL <AdalbertMemSQL@users.noreply.github.com>

Author: AdalbertMemSQL

src/Query/Grammar.php

@@ -122,26 +122,43 @@ public function prepareBindingsForUpdate(array $bindings, array $values)
         return parent::prepareBindingsForUpdate($bindings, $values);
     }
 
+    /**
+     * Transforms expressions to their scalar types.
+     *
+     * @param  \Illuminate\Contracts\Database\Query\Expression|string|int|float  $expression
+     * @return string|int|float
+     */
+    public function getValue($expression)
+    {
+        if ($this->isExpression($expression)) {
+            return $this->getValue($expression->getValue($this));
+        }
+
+        return $expression;
+    }
+
     protected function whereNull(Builder $query, $where)
     {
-        if ($this->isJsonSelector($where['column'])) {
+        $columnValue = (string) $this->getValue($where['column']);
+        if ($this->isJsonSelector($columnValue)) {
             [$field, $path] = $this->wrapJsonFieldAndPath($where['column']);
 
             return '(JSON_EXTRACT_JSON('.$field.$path.') IS NULL OR JSON_GET_TYPE(JSON_EXTRACT_JSON('.$field.$path.')) = \'NULL\')';
         }
 
-        return parent::whereNull($query, $where);
+        return $this->wrap($where['column']).' is null';
     }
 
     protected function whereNotNull(Builder $query, $where)
     {
-        if ($this->isJsonSelector($where['column'])) {
+        $columnValue = (string) $this->getValue($where['column']);
+        if ($this->isJsonSelector($columnValue)) {
             [$field, $path] = $this->wrapJsonFieldAndPath($where['column']);
 
             return '(JSON_EXTRACT_JSON('.$field.$path.') IS NOT NULL AND JSON_GET_TYPE(JSON_EXTRACT_JSON('.$field.$path.')) != \'NULL\')';
         }
 
-        return parent::whereNotNull($query, $where);
+        return $this->wrap($where['column']).' is not null';
     }
 
     protected function wrapJsonSelector($value)

tests/Hybrid/Json/JsonWhereTest.php

@@ -128,6 +128,33 @@ public function where_null()
         $this->assertEquals($id3, $query->get()[1]->id);
     }
 
+    /** @test */
+    public function where_null_raw()
+    {
+        $query = DB::table('test')->whereNull(DB::raw('(SELECT NULL)'))->orderBy('id');
+
+        $this->assertEquals(
+            'select * from `test` where (SELECT NULL) is null order by `id` asc',
+            $query->toSql()
+        );
+
+        if (! $this->runHybridIntegrations()) {
+            return;
+        }
+
+        [$id1, $id2, $id3, $id4] = $this->insertJsonData([
+            ['value1' => ['value2' => 'string']],
+            ['value1' => null],
+            [null],
+            ['value1' => ['value2' => 1]],
+        ]);
+
+        $this->assertEquals($id1, $query->get()[0]->id);
+        $this->assertEquals($id2, $query->get()[1]->id);
+        $this->assertEquals($id3, $query->get()[2]->id);
+        $this->assertEquals($id4, $query->get()[3]->id);
+    }
+
     /** @test */
     public function where_not_null()
     {
@@ -153,4 +180,31 @@ public function where_not_null()
         $this->assertEquals($id1, $query->get()[0]->id);
         $this->assertEquals($id4, $query->get()[1]->id);
     }
+
+    /** @test */
+    public function where_not_null_raw()
+    {
+        $query = DB::table('test')->whereNotNull(DB::raw('(SELECT 1)'))->orderBy('id');
+
+        $this->assertEquals(
+            'select * from `test` where (SELECT 1) is not null order by `id` asc',
+            $query->toSql()
+        );
+
+        if (! $this->runHybridIntegrations()) {
+            return;
+        }
+
+        [$id1, $id2, $id3, $id4] = $this->insertJsonData([
+            ['value1' => ['value2' => 'string']],
+            ['value1' => null],
+            [null],
+            ['value1' => ['value2' => 1]],
+        ]);
+
+        $this->assertEquals($id1, $query->get()[0]->id);
+        $this->assertEquals($id2, $query->get()[1]->id);
+        $this->assertEquals($id3, $query->get()[2]->id);
+        $this->assertEquals($id4, $query->get()[3]->id);
+    }
 }