jun-he commented on code in PR #4908:
URL: https://github.com/apache/iceberg/pull/4908#discussion_r895253856
##########
python/src/iceberg/transforms.py:
##########
@@ -224,6 +227,80 @@ def hash(self, value: UUID) -> int:
)
+def _base64encode(buffer: bytes) -> str:
+ """Converts bytes to base64 string"""
+ return base64.b64encode(buffer).decode("ISO-8859-1")
+
+
+class IdentityTransform(Transform[S, S]):
+ """Transforms a value into itself.
+
+ Example:
+ >>> transform = IdentityTransform(StringType())
+ >>> transform.apply('hello-world')
+ 'hello-world'
+ """
+
+ def __init__(self, source_type: IcebergType):
+ super().__init__(
+ "identity",
+ f"transforms.identity(source_type={repr(source_type)})",
+ )
+ self._type = source_type
+
+ def apply(self, value: Optional[S]) -> Optional[S]:
+ return value
+
+ def can_transform(self, source: IcebergType) -> bool:
+ return source.is_primitive
+
+ def result_type(self, source: IcebergType) -> IcebergType:
+ return source
+
+ @property
+ def preserves_order(self) -> bool:
+ return True
+
+ def satisfies_order_of(self, other: Transform) -> bool:
+ """ordering by value is the same as long as the other preserves
order"""
+ return other.preserves_order
+
+ def to_human_string(self, value: Optional[S]) -> str:
+ return self._human_string(value)
+
+ @singledispatchmethod
+ def _human_string(self, value: Optional[S]) -> str:
Review Comment:
You mean moving them out of the class?
Wondering if we can save `_human_string` but only keeps
`_int_to_human_string`.
like
```
def to_human_string(self, value: Optional[S]) -> str:
if value is None:
return "null"
elif isinstance(value, bytes):
return _base64encode(value)
elif isinstance(value, int):
return self._int_to_human_string(self._type, value)
else:
return str(value)
```
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