diff --git a/src/core/etl/src/Flow/ETL/DSL/functions.php b/src/core/etl/src/Flow/ETL/DSL/functions.php
index 1d8facb83..f73886cab 100644
--- a/src/core/etl/src/Flow/ETL/DSL/functions.php
+++ b/src/core/etl/src/Flow/ETL/DSL/functions.php
@@ -367,50 +367,3 @@ function array_to_rows(array $data, EntryFactory $entryFactory = new NativeEntry
 
     return new Rows(...$rows);
 }
-
-/**
- * @psalm-suppress MixedAssignment
- */
-function array_is_structure(array $array) : bool
-{
-    if (\array_is_list($array)) {
-        return false;
-    }
-
-    if (!\count($array)) {
-        return false;
-    }
-
-    foreach ($array as $key => $value) {
-        if (!\is_string($key)) {
-            return false;
-        }
-
-        if (\is_array($value)) {
-            if (!array_is_structure($value)) {
-                return false;
-            }
-        }
-    }
-
-    return true;
-}
-
-/**
- * @psalm-suppress MixedArgumentTypeCoercion
- * @psalm-suppress MixedAssignment
- */
-function array_to_structure(string $name, array $array, EntryFactory $entry_factory = new NativeEntryFactory()) : Row\Entry\StructureEntry
-{
-    $structureEntries = [];
-
-    foreach ($array as $key => $value) {
-        if (\is_array($value)) {
-            $structureEntries[] = array_to_structure($key, $value, $entry_factory);
-        } else {
-            $structureEntries[] = $entry_factory->create($key, $value);
-        }
-    }
-
-    return new Row\Entry\StructureEntry($name, ...$structureEntries);
-}
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 0c57bf3f6..f4ea14af4 100644
--- a/src/core/etl/src/Flow/ETL/Row/Factory/NativeEntryFactory.php
+++ b/src/core/etl/src/Flow/ETL/Row/Factory/NativeEntryFactory.php
@@ -4,8 +4,6 @@
 
 namespace Flow\ETL\Row\Factory;
 
-use function Flow\ETL\DSL\array_is_structure;
-use function Flow\ETL\DSL\array_to_structure;
 use Flow\ETL\DSL\Entry as EntryDSL;
 use Flow\ETL\Exception\InvalidArgumentException;
 use Flow\ETL\Row;
@@ -108,8 +106,8 @@ public function create(string $entryName, mixed $value) : Entry
                 return new Row\Entry\ArrayEntry($entryName, $value);
             }
 
-            if (array_is_structure($value)) {
-                return array_to_structure($entryName, $value);
+            if ($this->isStructure($value)) {
+                return $this->createStructureEntryFromArray($entryName, $value);
             }
 
             if (!\array_is_list($value)) {
@@ -171,6 +169,25 @@ public function create(string $entryName, mixed $value) : Entry
         throw new InvalidArgumentException("{$type} can't be converted to any known Entry");
     }
 
+    /**
+     * @psalm-suppress MixedArgumentTypeCoercion
+     * @psalm-suppress MixedAssignment
+     */
+    private function createStructureEntryFromArray(string $entryName, array $array) : Row\Entry\StructureEntry
+    {
+        $structureEntries = [];
+
+        foreach ($array as $key => $value) {
+            if (\is_array($value)) {
+                $structureEntries[] = $this->createStructureEntryFromArray($key, $value);
+            } else {
+                $structureEntries[] = $this->create($key, $value);
+            }
+        }
+
+        return new Row\Entry\StructureEntry($entryName, ...$structureEntries);
+    }
+
     private function fromDefinition(Schema\Definition $definition, mixed $value) : Entry
     {
         if ($definition->isNullable() && null === $value) {
@@ -320,6 +337,32 @@ private function isJson(string $string) : bool
         }
     }
 
+    /**
+     * @psalm-suppress MixedAssignment
+     */
+    private function isStructure(array $array) : bool
+    {
+        if (\array_is_list($array)) {
+            return false;
+        }
+
+        if (!\count($array)) {
+            return false;
+        }
+
+        foreach ($array as $key => $value) {
+            if (!\is_string($key)) {
+                return false;
+            }
+
+            if (\is_array($value) && !$this->isStructure($value)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
     private function isUuid(string $string) : bool
     {
         if (\strlen($string) !== 36) {