rdblue commented on code in PR #7831:
URL: https://github.com/apache/iceberg/pull/7831#discussion_r1263156291
##########
python/pyiceberg/io/pyarrow.py:
##########
@@ -1013,3 +1025,271 @@ def map_key_partner(self, partner_map:
Optional[pa.Array]) -> Optional[pa.Array]
def map_value_partner(self, partner_map: Optional[pa.Array]) ->
Optional[pa.Array]:
return partner_map.items if isinstance(partner_map, pa.MapArray) else
None
+
+
+class StatsAggregator:
+ def __init__(self, type_string: str, trunc_length: Optional[int] = None)
-> None:
+ self.current_min: Any = None
+ self.current_max: Any = None
+ self.trunc_length = trunc_length
+ self.primitive_type: Optional[PrimitiveType] = None
+
+ if type_string == "BOOLEAN":
+ self.primitive_type = BooleanType()
+ elif type_string == "INT32":
+ self.primitive_type = IntegerType()
+ elif type_string == "INT64":
+ self.primitive_type = LongType()
+ elif type_string == "INT96":
+ raise NotImplementedError("Statistics not implemented for INT96
physical type")
+ elif type_string == "FLOAT":
+ self.primitive_type = FloatType()
+ elif type_string == "DOUBLE":
+ self.primitive_type = DoubleType()
+ elif type_string == "BYTE_ARRAY":
+ self.primitive_type = BinaryType()
+ elif type_string == "FIXED_LEN_BYTE_ARRAY":
+ self.primitive_type = BinaryType()
+ else:
+ raise AssertionError(f"Unknown physical type {type_string}")
+
+ def serialize(self, value: Any) -> bytes:
+ if type(value) == str:
+ value = value.encode()
+ assert self.primitive_type is not None # appease mypy
+ return to_bytes(self.primitive_type, value)
+
+ def add_min(self, val: Any) -> None:
+ if self.current_min is None:
+ self.current_min = val
+ else:
+ self.current_min = min(val, self.current_min)
+
+ def add_max(self, val: Any) -> None:
+ if self.current_max is None:
+ self.current_max = val
+ else:
+ self.current_max = max(self.current_max, val)
+
+ def get_min(self) -> bytes:
+ return self.serialize(self.current_min)[: self.trunc_length]
+
+ def get_max(self) -> bytes:
+ return self.serialize(self.current_max)[: self.trunc_length]
Review Comment:
Truncation is more complicated because you can corrupt the max by
truncating. We'll need to implement the equivalent of `UnicodeUtil` for max.
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