diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4801b87b..1448fd31f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 - Enh #784: Specify result type of `ConstraintSchemaInterface::getTableIndexes()` method to `IndexConstraint[]` (@vjik)
 - Enh #784: Remove unused code in `AbstractSchema::getTableIndexes()` (@vjik)
 - Bug #788: Fix casting integer to string in `AbstractCommand::getRawSql()` (@Tigrov)
+- Enh #789: Remove unnecessary type casting to array in `AbstractDMLQueryBuilder::getTableUniqueColumnNames()` (@Tigrov)
 
 ## 1.2.0 November 12, 2023
 
diff --git a/src/QueryBuilder/AbstractDMLQueryBuilder.php b/src/QueryBuilder/AbstractDMLQueryBuilder.php
index b3c0a4132..ba435dc10 100644
--- a/src/QueryBuilder/AbstractDMLQueryBuilder.php
+++ b/src/QueryBuilder/AbstractDMLQueryBuilder.php
@@ -380,7 +380,7 @@ static function (Constraint $constraint) use ($quoter, $columns, &$columnNames):
                     $result = empty(array_diff($constraintColumnNames, $columns));
 
                     if ($result) {
-                        $columnNames = array_merge((array) $columnNames, $constraintColumnNames);
+                        $columnNames = array_merge($columnNames, $constraintColumnNames);
                     }
 
                     return $result;
diff --git a/tests/AbstractQueryBuilderTest.php b/tests/AbstractQueryBuilderTest.php
index d6de07f63..332c57186 100644
--- a/tests/AbstractQueryBuilderTest.php
+++ b/tests/AbstractQueryBuilderTest.php
@@ -210,14 +210,21 @@ public function testAlterColumn(): void
      *
      * @psalm-param array<array-key, string> $columns
      */
-    public function testBatchInsert(string $table, array $columns, iterable $rows, string $expected): void
-    {
+    public function testBatchInsert(
+        string $table,
+        array $columns,
+        iterable $rows,
+        string $expected,
+        array $expectedParams = [],
+    ): void {
         $db = $this->getConnection();
-
         $qb = $db->getQueryBuilder();
-        $sql = $qb->batchInsert($table, $columns, $rows);
+
+        $params = [];
+        $sql = $qb->batchInsert($table, $columns, $rows, $params);
 
         $this->assertSame($expected, $sql);
+        $this->assertSame($expectedParams, $params);
     }
 
     /**
diff --git a/tests/Db/QueryBuilder/QueryBuilderTest.php b/tests/Db/QueryBuilder/QueryBuilderTest.php
index 93356917f..c549aec3d 100644
--- a/tests/Db/QueryBuilder/QueryBuilderTest.php
+++ b/tests/Db/QueryBuilder/QueryBuilderTest.php
@@ -47,15 +47,22 @@ public function testAddDefaultValue(): void
     /**
      * @dataProvider \Yiisoft\Db\Tests\Provider\QueryBuilderProvider::batchInsert
      */
-    public function testBatchInsert(string $table, array $columns, iterable $rows, string $expected): void
-    {
+    public function testBatchInsert(
+        string $table,
+        array $columns,
+        iterable $rows,
+        string $expected,
+        array $expectedParams = [],
+    ): void {
         $db = $this->getConnection();
 
         $schemaMock = $this->createMock(Schema::class);
         $qb = new QueryBuilder($db->getQuoter(), $schemaMock);
+        $params = [];
 
         try {
-            $this->assertSame($expected, $qb->batchInsert($table, $columns, $rows));
+            $this->assertSame($expected, $qb->batchInsert($table, $columns, $rows, $params));
+            $this->assertSame($expectedParams, $params);
         } catch (InvalidArgumentException|Exception) {
         }
     }
diff --git a/tests/Provider/QueryBuilderProvider.php b/tests/Provider/QueryBuilderProvider.php
index a70696668..3a960ab6a 100644
--- a/tests/Provider/QueryBuilderProvider.php
+++ b/tests/Provider/QueryBuilderProvider.php
@@ -145,7 +145,7 @@ public static function batchInsert(): array
                     SQL,
                     static::$driverName,
                 ),
-                [':qp0' => 'test@example.com', ':qp1' => 'silverfire', ':qp2' => 'Kyiv {{city}}, Ukraine'],
+                'expectedParams' => [':qp0' => 'test@example.com', ':qp1' => 'silverfire', ':qp2' => 'Kyiv {{city}}, Ukraine'],
             ],
             'escape-danger-chars' => [
                 'customer',
@@ -157,7 +157,7 @@ public static function batchInsert(): array
                     SQL,
                     static::$driverName,
                 ),
-                [':qp0' => "SQL-danger chars are escaped: '); --"],
+                'expectedParams' => [':qp0' => "SQL-danger chars are escaped: '); --"],
             ],
             'customer2' => [
                 'customer',
@@ -175,7 +175,7 @@ public static function batchInsert(): array
                     SQL,
                     static::$driverName,
                 ),
-                [':qp0' => 'no columns passed'],
+                'expectedParams' => [':qp0' => 'no columns passed'],
             ],
             'bool-false, bool2-null' => [
                 'type',
@@ -187,7 +187,7 @@ public static function batchInsert(): array
                     SQL,
                     static::$driverName,
                 ),
-                [':qp0' => 0, ':qp1' => null],
+                'expectedParams' => [':qp0' => false, ':qp1' => null],
             ],
             'wrong' => [
                 '{{%type}}',
@@ -199,7 +199,7 @@ public static function batchInsert(): array
                     SQL,
                     static::$driverName,
                 ),
-                [':qp0' => null, ':qp1' => null],
+                'expectedParams' => [':qp0' => null, ':qp1' => null],
             ],
             'bool-false, time-now()' => [
                 '{{%type}}',
@@ -211,7 +211,7 @@ public static function batchInsert(): array
                     SQL,
                     static::$driverName,
                 ),
-                [':qp0' => null],
+                'expectedParams' => [':qp0' => false],
             ],
             'column table names are not checked' => [
                 '{{%type}}',
@@ -223,7 +223,7 @@ public static function batchInsert(): array
                     SQL,
                     static::$driverName,
                 ),
-                [':qp0' => null, ':qp1' => null],
+                'expectedParams' => [':qp0' => true, ':qp1' => false],
             ],
             'empty-sql' => [
                 '{{%type}}',