diff --git a/src/adapter/etl-adapter-parquet/src/Flow/ETL/Adapter/Parquet/ParquetLoader.php b/src/adapter/etl-adapter-parquet/src/Flow/ETL/Adapter/Parquet/ParquetLoader.php
index 63daa0891..ffd329526 100644
--- a/src/adapter/etl-adapter-parquet/src/Flow/ETL/Adapter/Parquet/ParquetLoader.php
+++ b/src/adapter/etl-adapter-parquet/src/Flow/ETL/Adapter/Parquet/ParquetLoader.php
@@ -6,6 +6,7 @@
 use Flow\ETL\FlowContext;
 use Flow\ETL\Loader;
 use Flow\ETL\Loader\Closure;
+use Flow\ETL\PHP\Type\Caster;
 use Flow\ETL\Row\Schema;
 use Flow\ETL\Rows;
 use Flow\Parquet\Options;
@@ -32,7 +33,7 @@ public function __construct(
         private readonly ?Schema $schema = null,
     ) {
         $this->converter = new SchemaConverter();
-        $this->normalizer = new RowsNormalizer();
+        $this->normalizer = new RowsNormalizer(Caster::default());
 
         if ($this->path->isPattern()) {
             throw new \InvalidArgumentException("ParquetLoader path can't be pattern, given: " . $this->path->path());
@@ -77,7 +78,7 @@ public function load(Rows $rows, FlowContext $context) : void
                 $this->writers[$stream->path()->uri()]->openForStream($stream->resource(), $this->converter->toParquet($this->schema()));
             }
 
-            $this->writers[$stream->path()->uri()]->writeBatch($this->normalizer->normalize($rows));
+            $this->writers[$stream->path()->uri()]->writeBatch($this->normalizer->normalize($rows, $this->schema()));
         } else {
             $stream = $streams->open($this->path, 'parquet', $context->appendSafe());
 
@@ -90,7 +91,7 @@ public function load(Rows $rows, FlowContext $context) : void
                 $this->writers[$stream->path()->uri()]->openForStream($stream->resource(), $this->converter->toParquet($this->schema()));
             }
 
-            $this->writers[$stream->path()->uri()]->writeBatch($this->normalizer->normalize($rows));
+            $this->writers[$stream->path()->uri()]->writeBatch($this->normalizer->normalize($rows, $this->schema()));
         }
     }
 
diff --git a/src/adapter/etl-adapter-parquet/src/Flow/ETL/Adapter/Parquet/RowsNormalizer.php b/src/adapter/etl-adapter-parquet/src/Flow/ETL/Adapter/Parquet/RowsNormalizer.php
index 2b320bba9..e3d0646be 100644
--- a/src/adapter/etl-adapter-parquet/src/Flow/ETL/Adapter/Parquet/RowsNormalizer.php
+++ b/src/adapter/etl-adapter-parquet/src/Flow/ETL/Adapter/Parquet/RowsNormalizer.php
@@ -2,15 +2,22 @@
 
 namespace Flow\ETL\Adapter\Parquet;
 
+use function Flow\ETL\DSL\type_string;
+use Flow\ETL\PHP\Type\Caster;
 use Flow\ETL\Row\Entry\UuidEntry;
+use Flow\ETL\Row\Schema;
 use Flow\ETL\Rows;
 
 final class RowsNormalizer
 {
+    public function __construct(private readonly Caster $caster)
+    {
+    }
+
     /**
      * @return array<mixed, array<string, mixed>>
      */
-    public function normalize(Rows $rows) : array
+    public function normalize(Rows $rows, Schema $schema) : array
     {
         $normalizedRows = [];
 
@@ -19,8 +26,8 @@ public function normalize(Rows $rows) : array
 
             foreach ($row->entries() as $entry) {
                 $columns[$entry->name()] = match ($entry::class) {
-                    UuidEntry::class => $entry->value()->toString(),
-                    default => $entry->value(),
+                    UuidEntry::class => $this->caster->to(type_string())->value($entry->value()),
+                    default => $this->caster->to($schema->getDefinition($entry->ref())->type())->value($entry->value()),
                 };
             }
 
diff --git a/src/adapter/etl-adapter-parquet/tests/Flow/ETL/Adapter/Parquet/Tests/Integration/ParquetTest.php b/src/adapter/etl-adapter-parquet/tests/Flow/ETL/Adapter/Parquet/Tests/Integration/ParquetTest.php
index 0fd34faa6..59b2a1bec 100644
--- a/src/adapter/etl-adapter-parquet/tests/Flow/ETL/Adapter/Parquet/Tests/Integration/ParquetTest.php
+++ b/src/adapter/etl-adapter-parquet/tests/Flow/ETL/Adapter/Parquet/Tests/Integration/ParquetTest.php
@@ -8,13 +8,17 @@
 use function Flow\ETL\DSL\datetime_entry;
 use function Flow\ETL\DSL\df;
 use function Flow\ETL\DSL\float_entry;
+use function Flow\ETL\DSL\from_array;
 use function Flow\ETL\DSL\from_rows;
 use function Flow\ETL\DSL\int_entry;
 use function Flow\ETL\DSL\json_entry;
 use function Flow\ETL\DSL\json_object_entry;
+use function Flow\ETL\DSL\json_schema;
 use function Flow\ETL\DSL\list_entry;
 use function Flow\ETL\DSL\ref;
+use function Flow\ETL\DSL\schema;
 use function Flow\ETL\DSL\str_entry;
+use function Flow\ETL\DSL\str_schema;
 use function Flow\ETL\DSL\struct_element;
 use function Flow\ETL\DSL\struct_entry;
 use function Flow\ETL\DSL\struct_type;
@@ -44,10 +48,10 @@ public function test_writing_to_file() : void
             ->run();
 
         $this->assertEquals(
-            $rows,
+            $rows->toArray(),
             (new Flow())
                 ->read(from_parquet($path))
-                ->fetch()
+                ->fetch()->toArray()
         );
 
         $parquetFile = (new Reader())->read($path);
@@ -96,6 +100,41 @@ public function test_writing_with_partitioning() : void
         $this->cleanDirectory($path);
     }
 
+    public function test_writing_with_provided_schema() : void
+    {
+        $path = \sys_get_temp_dir() . '/file_schema.snappy.parquet';
+        $this->removeFile($path);
+
+        df()
+            ->read(from_array([
+                ['id' => 1, 'name' => 'test', 'uuid' => Uuid::fromString('26fd21b0-6080-4d6c-bdb4-1214f1feffef'), 'json' => '[{"id":1,"name":"test"},{"id":2,"name":"test"}]'],
+                ['id' => 2, 'name' => 'test', 'uuid' => Uuid::fromString('26fd21b0-6080-4d6c-bdb4-1214f1feffef'), 'json' => '[{"id":1,"name":"test"},{"id":2,"name":"test"}]'],
+            ]))
+            ->write(
+                to_parquet($path, schema: schema(
+                    str_schema('id'),
+                    str_schema('name'),
+                    str_schema('uuid'),
+                    json_schema('json'),
+                ))
+            )
+            ->run();
+
+        $this->assertEquals(
+            [
+                ['id' => '1', 'name' => 'test', 'uuid' => new Row\Entry\Type\Uuid('26fd21b0-6080-4d6c-bdb4-1214f1feffef'), 'json' => '[{"id":1,"name":"test"},{"id":2,"name":"test"}]'],
+                ['id' => '2', 'name' => 'test', 'uuid' => new Row\Entry\Type\Uuid('26fd21b0-6080-4d6c-bdb4-1214f1feffef'), 'json' => '[{"id":1,"name":"test"},{"id":2,"name":"test"}]'],
+            ],
+            df()
+                ->read(from_parquet($path))
+                ->fetch()
+                ->toArray()
+        );
+
+        $this->assertFileExists($path);
+        $this->removeFile($path);
+    }
+
     /**
      * @param string $path
      */
diff --git a/src/core/etl/src/Flow/ETL/Partition.php b/src/core/etl/src/Flow/ETL/Partition.php
index de45013f8..5a5d5e483 100644
--- a/src/core/etl/src/Flow/ETL/Partition.php
+++ b/src/core/etl/src/Flow/ETL/Partition.php
@@ -68,7 +68,7 @@ public static function fromUri(string $uri) : Partitions
 
         $partitions = [];
 
-        foreach (\array_filter(\explode('/', $uri), 'strlen') as $uriPart) {
+        foreach (\array_filter(\explode('/', $uri), static fn (string $s) : bool => (bool) \strlen($s)) as $uriPart) {
             if (\preg_match($regex, $uriPart, $matches)) {
                 $partitions[] = new self($matches[1], $matches[2]);
             }
diff --git a/src/core/etl/src/Flow/ETL/Row/Factory/NativeEntryFactory.php b/src/core/etl/src/Flow/ETL/Row/Factory/NativeEntryFactory.php
index 7e288d56e..22c3639ea 100644
--- a/src/core/etl/src/Flow/ETL/Row/Factory/NativeEntryFactory.php
+++ b/src/core/etl/src/Flow/ETL/Row/Factory/NativeEntryFactory.php
@@ -106,7 +106,11 @@ public function create(string $entryName, mixed $value, ?Schema $schema = null)
         }
 
         if ($valueType instanceof UuidType) {
-            return uuid_entry($entryName, $value);
+            if ($value instanceof Entry\Type\Uuid) {
+                return uuid_entry($entryName, $value);
+            }
+
+            return uuid_entry($entryName, (string) $value);
         }
 
         if ($valueType instanceof DateTimeType) {