[GitHub] [arrow] vibhatha commented on a diff in pull request #12672: ARROW-15779: [Python] Create python bindings for Substrait consumer

[GitBox <gi...@apache.org>]

vibhatha commented on code in PR #12672:
URL: https://github.com/apache/arrow/pull/12672#discussion_r845776851


##########
python/pyarrow/tests/test_substrait.py:
##########
@@ -0,0 +1,91 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+import os
+import pathlib
+import pyarrow as pa
+from pyarrow.lib import tobytes
+import pyarrow.parquet as pq
+
+try:
+    from pyarrow import engine
+    from pyarrow.engine import (
+        run_query,
+    )
+except ImportError:
+    engine = None
+
+
+def test_import():
+    # So we see the ImportError somewhere
+    import pyarrow.engine  # noqa
+
+
+def resource_root():
+    """Get the path to the test resources directory."""
+    if not os.environ.get("PARQUET_TEST_DATA"):
+        raise RuntimeError("Test resources not found; set "
+                           "PARQUET_TEST_DATA to "
+                           "<repo root>/cpp/submodules/parquet-testing/data")
+    return pathlib.Path(os.environ["PARQUET_TEST_DATA"])
+
+
+def test_run_query():
+    filename = str(resource_root() / "binary.parquet")
+
+    query = """
+    {
+        "relations": [
+        {"rel": {
+            "read": {
+            "base_schema": {
+                "struct": {
+                "types": [
+                            {"binary": {}}
+                        ]
+                },
+                "names": [
+                        "foo"
+                        ]
+            },
+            "local_files": {
+                "items": [
+                {
+                    "uri_file": "file://FILENAME_PLACEHOLDER",
+                    "format": "FILE_FORMAT_PARQUET"
+                }
+                ]
+            }
+            }
+        }}
+        ]
+    }
+    """
+
+    query = tobytes(query.replace("FILENAME_PLACEHOLDER", filename))

Review Comment:
   There are so many braces already in the string. Won't it complicate things and make it unreadable? 



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