accept stage paths starting with / for GET (#2889)

Author: sfc-gh-tvanderkooy

CHANGELOG.md

@@ -73,6 +73,7 @@
 - Added support for creating a temporary view via `DataFrame.create_or_replace_temp_view` from a DataFrame created by reading a file from a stage.
 - Added support for `value_contains_null` parameter to MapType.
 - Added `interactive` to telemetry that indicates whether the current environment is an interactive one.
+- Allow `session.file.get` in a Native App to read file paths starting with `/` from the current version 
 
 #### Bug Fixes
 

src/snowflake/snowpark/_internal/utils.py

@@ -65,10 +65,14 @@
 
 STAGE_PREFIX = "@"
 SNOWURL_PREFIX = "snow://"
+RELATIVE_PATH_PREFIX = "/"
 SNOWFLAKE_PATH_PREFIXES = [
     STAGE_PREFIX,
     SNOWURL_PREFIX,
 ]
+SNOWFLAKE_PATH_PREFIXES_FOR_GET = SNOWFLAKE_PATH_PREFIXES + [
+    RELATIVE_PATH_PREFIX,
+]
 
 # Scala uses 3 but this can be larger. Consider allowing users to configure it.
 QUERY_TAG_TRACEBACK_LIMIT = 3
@@ -372,7 +376,7 @@ def normalize_path(path: str, is_local: bool) -> str:
     a directory named "load data". Therefore, if `path` is already wrapped by single quotes,
     we do nothing.
     """
-    prefixes = ["file://"] if is_local else SNOWFLAKE_PATH_PREFIXES
+    prefixes = ["file://"] if is_local else SNOWFLAKE_PATH_PREFIXES_FOR_GET
     if is_single_quoted(path):
         return path
     if is_local and OPERATING_SYSTEM == "Windows":
@@ -408,7 +412,7 @@ def split_path(path: str) -> Tuple[str, str]:
 
 def unwrap_stage_location_single_quote(name: str) -> str:
     new_name = unwrap_single_quote(name)
-    if any(new_name.startswith(prefix) for prefix in SNOWFLAKE_PATH_PREFIXES):
+    if any(new_name.startswith(prefix) for prefix in SNOWFLAKE_PATH_PREFIXES_FOR_GET):
         return new_name
     return f"{STAGE_PREFIX}{new_name}"
 

tests/unit/test_internal_utils.py

@@ -62,6 +62,8 @@ def test_split_path(path: str, expected_dir: str, expected_file: str) -> None:
             False,
             "'snow://domain/test_entity/versions/test_version/file.txt'",
         ),
+        ("/some/file.yml", False, "'/some/file.yml'"),
+        ("'/some/file.yml'", False, "'/some/file.yml'"),
     ],
 )
 def test_normalize_path(path: str, is_local: bool, expected: str) -> None: