Allow running the Avro decoder tests without Arrow (#335)

* Allow running the Avro decoder tests without Arrow

It looks like PyArrow binaries are not available
for all architectures, and therefore it tries to
compile it locally when it isn't available.

We want to avoid this since Arrow requires a rather
complicated buildchain.

* Revert unnecessary move

.github/workflows/python-release.yml

@@ -68,7 +68,7 @@ jobs:
           CIBW_ARCHS: "auto64"
           CIBW_PROJECT_REQUIRES_PYTHON: ">=3.8,<3.12"
           CIBW_TEST_REQUIRES: "pytest==7.4.2 moto==4.2.2"
-          CIBW_TEST_EXTRAS: "s3fs,glue,pyarrow"
+          CIBW_TEST_EXTRAS: "s3fs,glue"
           CIBW_TEST_COMMAND: "pytest {project}/tests/avro/test_decoder.py"
           # There is an upstream issue with installing on MacOSX
           # https://github.com/pypa/cibuildwheel/issues/1603

tests/conftest.py

@@ -44,7 +44,6 @@
 from urllib.parse import urlparse
 
 import boto3
-import pyarrow as pa
 import pytest
 from moto import mock_dynamodb, mock_glue
 
@@ -85,6 +84,7 @@
 from pyiceberg.utils.datetime import datetime_to_millis
 
 if TYPE_CHECKING:
+    import pyarrow as pa
     from moto.server import ThreadedMotoServer  # type: ignore
 
     from pyiceberg.io.pyarrow import PyArrowFile, PyArrowFileIO
@@ -267,7 +267,9 @@ def table_schema_nested_with_struct_key_map() -> Schema:
 
 
 @pytest.fixture(scope="session")
-def pyarrow_schema_simple_without_ids() -> pa.Schema:
+def pyarrow_schema_simple_without_ids() -> "pa.Schema":
+    import pyarrow as pa
+
     return pa.schema([
         pa.field('foo', pa.string(), nullable=True),
         pa.field('bar', pa.int32(), nullable=False),
@@ -276,7 +278,9 @@ def pyarrow_schema_simple_without_ids() -> pa.Schema:
 
 
 @pytest.fixture(scope="session")
-def pyarrow_schema_nested_without_ids() -> pa.Schema:
+def pyarrow_schema_nested_without_ids() -> "pa.Schema":
+    import pyarrow as pa
+
     return pa.schema([
         pa.field('foo', pa.string(), nullable=False),
         pa.field('bar', pa.int32(), nullable=False),