rdblue commented on a change in pull request #3450: URL: https://github.com/apache/iceberg/pull/3450#discussion_r750457113
########## File path: python/src/iceberg/utils/transform_util.py ########## @@ -0,0 +1,116 @@ +# 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 base64 +import math +from datetime import datetime, timedelta +from decimal import Decimal + +import pytz + +_EPOCH = datetime.utcfromtimestamp(0) +_EPOCH_YEAR = _EPOCH.year + + +def human_year(year_ordinal: int) -> str: + return "{0:0=4d}".format(_EPOCH_YEAR + year_ordinal) + + +def human_month(month_ordinal: int) -> str: + return "{0:0=4d}-{1:0=2d}".format( + _EPOCH_YEAR + int(month_ordinal / 12), 1 + int(month_ordinal % 12) + ) + + +def human_day(day_ordinal: int) -> str: + time = _EPOCH + timedelta(days=day_ordinal) + return "{0:0=4d}-{1:0=2d}-{2:0=2d}".format(time.year, time.month, time.day) + + +def human_hour(hour_ordinal: int) -> str: + time = _EPOCH + timedelta(hours=hour_ordinal) + return "{0:0=4d}-{1:0=2d}-{2:0=2d}-{3:0=2d}".format( + time.year, time.month, time.day, time.hour + ) + + +def human_time(micros_from_midnight: int) -> str: + day = _EPOCH + timedelta(microseconds=micros_from_midnight) + return f"{day.time()}" + + +def human_timestamptz(timestamp_micros: int) -> str: + day = _EPOCH + timedelta(microseconds=timestamp_micros) + return pytz.timezone("UTC").localize(day).strftime("%Y-%m-%dT%H:%M:%S.%fZ") + + +def human_timestamp(timestamp_micros: int) -> str: + day = _EPOCH + timedelta(microseconds=timestamp_micros) + return day.isoformat() + + +def base64encode(buffer: bytes) -> str: + return base64.b64encode(buffer).decode("ISO-8859-1") + + +def _unscale_decimal(decimal_value: Decimal) -> int: + value_tuple = decimal_value.as_tuple() + return int( + ("-" if value_tuple.sign else "") + + "".join([str(d) for d in value_tuple.digits]) + ) + + +def decimal_to_bytes(value: Decimal) -> bytes: + unscaled_value = _unscale_decimal(value) + number_of_bytes = int(math.ceil(unscaled_value.bit_length() / 8)) + return unscaled_value.to_bytes(length=number_of_bytes, byteorder="big") + + +def truncate_decimal(value: Decimal, width: int) -> Decimal: + unscaled_value = _unscale_decimal(value) + applied_value = unscaled_value - (((unscaled_value % width) + width) % width) + return Decimal(f"{applied_value}e{value.as_tuple().exponent}") + + +def diff_hour(date1: datetime): + return int((date1 - _EPOCH).total_seconds() / 3600) + + +def diff_day(date1: datetime): + return (date1 - _EPOCH).days + + +def diff_month(date1: datetime): + return ( + (date1.year - _EPOCH.year) * 12 + + (date1.month - _EPOCH.month) + - (1 if date1.day < _EPOCH.day else 0) + ) + + +def diff_year(date1: datetime): + return (date1.year - _EPOCH.year) - ( + 1 + if date1.month < _EPOCH.month + or (date1.month == _EPOCH.month and date1.day < _EPOCH.day) + else 0 + ) + + +def to_string(value) -> str: Review comment: Since this just calls a builtin, can we remove it and use `str` instead? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
