added where::asLiteral

src/Builder/Syntax/WhereWriter.php

@@ -196,6 +196,10 @@ protected function writeWhereComparisons(Where $where, array &$whereArray)
             $comparisons,
             function (&$comparison) {
 
+                if (!is_array($comparison)) {
+                    return;
+                }
+
                 $str = $this->writeWherePartialCondition($comparison['subject']);
                 $str .= $this->writer->writeConjunction($comparison['conjunction']);
                 $str .= $this->writeWherePartialCondition($comparison['target']);

src/Syntax/Where.php

@@ -382,6 +382,18 @@ protected function genericMatch(array &$columns, array &$values, $mode)
         return $this;
     }
 
+    /**
+     * @param string $literal
+     *
+     * @return $this
+     */
+    public function asLiteral($literal)
+    {
+        $this->comparisons[] = $literal;
+
+        return $this;
+    }
+
     /**
      * @param string[] $columns
      * @param mixed[]  $values

tests/Builder/Syntax/WhereWriterTest.php

@@ -520,4 +520,23 @@ public function itShouldBeAbleToDoWhereNotExists()
         $expected = array(':v1' => 'Nil', ':v2' => 1);
         $this->assertEquals($expected, $this->writer->getValues());
     }
+
+    /**
+     * @test
+     */
+    public function itShouldAllowWhereConditionAsLiteral()
+    {
+        $this->query
+            ->setTable('user')
+            ->where()
+            ->asLiteral("(username is not null and status=:status)")
+            ->notEquals('name', '%N%');
+
+        $expected = "SELECT user.* FROM user WHERE (username is not null and status=:status) AND (user.name <> :v1)";
+
+        $this->assertSame($expected, $this->writer->write($this->query));
+
+        $expected = array(':v1' => '%N%');
+        $this->assertEquals($expected, $this->writer->getValues());
+    }
 }

tests/Syntax/WhereTest.php

@@ -407,4 +407,13 @@ public function itShouldSetNotExistsCondition()
 
         $this->assertEquals(array($select1), $result);
     }
+
+    /**
+     * @test
+     */
+    public function itShouldReturnLiterals()
+    {
+        $result = $this->where->asLiteral("(username is not null and status=:status)")->getComparisons();
+        $this->assertSame("(username is not null and status=:status)", $result[0]);
+    }
 }