Lowercase bool values in table properties (apache#924)

Author: soumya-ghosh

pyiceberg/types.py

@@ -67,7 +67,7 @@ def transform_dict_value_to_str(dict: Dict[str, Any]) -> Dict[str, str]:
     for key, value in dict.items():
         if value is None:
             raise ValueError(f"None type is not a supported value in properties: {key}")
-    return {k: str(v) for k, v in dict.items()}
+    return {k: str(v).lower() if isinstance(v, bool) else str(v) for k, v in dict.items()}
 
 
 def _parse_decimal_type(decimal: Any) -> Tuple[int, int]:

tests/cli/test_console.py

@@ -83,7 +83,7 @@ def mock_datetime_now(monkeypatch: pytest.MonkeyPatch) -> None:
     NestedField(3, "z", LongType(), required=True),
 )
 TEST_TABLE_PARTITION_SPEC = PartitionSpec(PartitionField(name="x", transform=IdentityTransform(), source_id=1, field_id=1000))
-TEST_TABLE_PROPERTIES = {"read.split.target.size": "134217728"}
+TEST_TABLE_PROPERTIES = {"read.split.target.size": "134217728", "write.parquet.bloom-filter-enabled.column.x": True}
 TEST_TABLE_UUID = uuid.UUID("d20125c8-7284-442c-9aea-15fee620737c")
 TEST_TIMESTAMP = 1602638573874
 MOCK_ENVIRONMENT = {"PYICEBERG_CATALOG__PRODUCTION__URI": "test://doesnotexist"}
@@ -367,7 +367,10 @@ def test_properties_get_table(catalog: InMemoryCatalog) -> None:
     runner = CliRunner()
     result = runner.invoke(run, ["properties", "get", "table", "default.my_table"])
     assert result.exit_code == 0
-    assert result.output == "read.split.target.size  134217728\n"
+    assert (
+        result.output
+        == "read.split.target.size                       134217728\nwrite.parquet.bloom-filter-enabled.column.x  true     \n"
+    )
 
 
 def test_properties_get_table_specific_property(catalog: InMemoryCatalog) -> None:
@@ -763,7 +766,7 @@ def test_json_properties_get_table(catalog: InMemoryCatalog) -> None:
     runner = CliRunner()
     result = runner.invoke(run, ["--output=json", "properties", "get", "table", "default.my_table"])
     assert result.exit_code == 0
-    assert result.output == """{"read.split.target.size": "134217728"}\n"""
+    assert result.output == """{"read.split.target.size": "134217728", "write.parquet.bloom-filter-enabled.column.x": "true"}\n"""
 
 
 def test_json_properties_get_table_specific_property(catalog: InMemoryCatalog) -> None:

tests/test_types.py

@@ -44,6 +44,7 @@
     TimeType,
     UUIDType,
     strtobool,
+    transform_dict_value_to_str,
 )
 
 non_parameterized_types = [
@@ -649,3 +650,14 @@ def test_strtobool() -> None:
     for val in invalid_values:
         with pytest.raises(ValueError, match=f"Invalid truth value: {val!r}"):
             strtobool(val)
+
+
+def test_transform_dict_value_to_str() -> None:
+    input_dict = {"key1": 1, "key2": 2.0, "key3": "3", "key4: ": True, "key5": False}
+    expected_dict = {"key1": "1", "key2": "2.0", "key3": "3", "key4: ": "true", "key5": "false"}
+    # valid values
+    assert transform_dict_value_to_str(input_dict) == expected_dict
+    # Null value not allowed, should raise ValueError
+    input_dict["key6"] = None
+    with pytest.raises(ValueError, match="None type is not a supported value in properties: key6"):
+        transform_dict_value_to_str(input_dict)