Added functional test for date arithmetic using a column reference for SQLite

tests/Doctrine/Tests/DBAL/Functional/DataAccessTest.php

@@ -5,7 +5,9 @@ namespace Doctrine\Tests\DBAL\Functional;
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\FetchMode;
 use Doctrine\DBAL\ParameterType;
+use Doctrine\DBAL\Platforms\SqlitePlatform;
 use Doctrine\DBAL\Platforms\TrimMode;
+use Doctrine\DBAL\Schema\Table;
 use Doctrine\DBAL\Types\Type;
 use const CASE_LOWER;
 use const PHP_EOL;
@@ -569,6 +571,34 @@ class DataAccessTest extends \Doctrine\Tests\DbalFunctionalTestCase
         self::assertEquals('2004-01-01', date('Y-m-d', strtotime($row['sub_years'])), "Subtracting years should end up on 2004-01-01");
     }
 
+    public function testSqliteDateArithmeticWithDynamicInterval()
+    {
+        $platform = $this->_conn->getDatabasePlatform();
+
+        if (! $platform instanceof SqlitePlatform) {
+            $this->markTestSkipped('test is for sqlite only');
+        }
+
+        $table = new Table('fetch_table_date_math');
+        $table->addColumn('test_date', 'date');
+        $table->addColumn('test_days', 'integer');
+        $table->setPrimaryKey(['test_date']);
+
+        /* @var $sm \Doctrine\DBAL\Schema\AbstractSchemaManager */
+        $sm = $this->_conn->getSchemaManager();
+        $sm->createTable($table);
+
+        $this->_conn->insert('fetch_table_date_math', ['test_date' => '2010-01-01', 'test_days' => 10]);
+        $this->_conn->insert('fetch_table_date_math', ['test_date' => '2010-06-01', 'test_days' => 20]);
+
+        $sql  = 'SELECT COUNT(*) FROM fetch_table_date_math WHERE ';
+        $sql .= $platform->getDateSubDaysExpression('test_date', 'test_days') . " < '2010-05-12'";
+
+        $rowCount = $this->_conn->fetchColumn($sql, [], 0);
+
+        $this->assertEquals(1, $rowCount);
+    }
+
     public function testLocateExpression()
     {
         $platform = $this->_conn->getDatabasePlatform();