GH-48254: [Python][Parquet] Support extension types in read_schema

Author: Kuinox

python/pyarrow/parquet/core.py

@@ -259,6 +259,9 @@ class ParquetFile:
         If nothing passed, will be inferred based on path.
         Path will try to be found in the local on-disk filesystem otherwise
         it will be parsed as an URI to determine the filesystem.
+    arrow_extensions_enabled : bool, default True
+        If True, read Parquet logical types as Arrow extension types where
+        possible.
     page_checksum_verification : bool, default False
         If True, verify the checksum for each page read from the file.
     arrow_extensions_enabled : bool, default True
@@ -2382,7 +2385,7 @@ def read_metadata(where, memory_map=False, decryption_properties=None,
 
 
 def read_schema(where, memory_map=False, decryption_properties=None,
-                filesystem=None):
+                filesystem=None, arrow_extensions_enabled=True):
     """
     Read effective Arrow schema from Parquet file metadata.
 
@@ -2422,11 +2425,15 @@ def read_schema(where, memory_map=False, decryption_properties=None,
 
     with file_ctx:
         file = ParquetFile(
-            where, memory_map=memory_map,
-            decryption_properties=decryption_properties)
+            where,
+            memory_map=memory_map,
+            decryption_properties=decryption_properties,
+            arrow_extensions_enabled=arrow_extensions_enabled,
+        )
+        if arrow_extensions_enabled:
+            return file.schema_arrow
         return file.schema.to_arrow_schema()
 
-
 __all__ = (
     "ColumnChunkMetaData",
     "ColumnSchema",