mccormickt12 commented on code in PR #2291:
URL: https://github.com/apache/iceberg-python/pull/2291#discussion_r2302429908


##########
pyiceberg/io/pyarrow.py:
##########
@@ -387,15 +387,29 @@ def __init__(self, properties: Properties = EMPTY_DICT):
         super().__init__(properties=properties)
 
     @staticmethod
-    def parse_location(location: str) -> Tuple[str, str, str]:
-        """Return the path without the scheme."""
+    def parse_location(location: str, properties: Properties = EMPTY_DICT) -> 
Tuple[str, str, str]:
+        """Return (scheme, netloc, path) for the given location.
+
+        Uses DEFAULT_SCHEME and DEFAULT_NETLOC if scheme/netloc are missing.
+        """
         uri = urlparse(location)
+
+        default_scheme = properties.get("DEFAULT_SCHEME", "file")
+        default_netloc = properties.get("DEFAULT_NETLOC", "")
+
         if not uri.scheme:
-            return "file", uri.netloc, os.path.abspath(location)
-        elif uri.scheme in ("hdfs", "viewfs"):
-            return uri.scheme, uri.netloc, uri.path
+            scheme = default_scheme
+        if not uri.netloc:
+            netloc = default_netloc
+
+        if scheme in ("hdfs", "viewfs"):
+            return scheme, netloc, uri.path
         else:
-            return uri.scheme, uri.netloc, f"{uri.netloc}{uri.path}"
+            # For non-HDFS URIs, include netloc in the path if present
+            path = uri.path if uri.scheme else os.path.abspath(location)
+            if netloc and not path.startswith(netloc):
+                path = f"{netloc}{path}"
+            return scheme, netloc, path

Review Comment:
   this assumes the default scheme will only ever be hdfs, I think its better 
to leave this generic and before to allow other schemes to be default and still 
work 



##########
tests/io/test_pyarrow.py:
##########
@@ -2638,3 +2638,34 @@ def test_retry_strategy_not_found() -> None:
     io = PyArrowFileIO(properties={S3_RETRY_STRATEGY_IMPL: 
"pyiceberg.DoesNotExist"})
     with pytest.warns(UserWarning, match="Could not initialize S3 retry 
strategy: pyiceberg.DoesNotExist"):
         io.new_input("s3://bucket/path/to/file")
+
+
+def test_parse_location_environment_defaults() -> None:
+    """Test that parse_location uses environment variables for defaults."""

Review Comment:
   good catch



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