rdblue commented on code in PR #7873: URL: https://github.com/apache/iceberg/pull/7873#discussion_r1263073270
########## python/pyiceberg/avro/encoder.py: ########## @@ -0,0 +1,175 @@ +# 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 decimal +import struct +from datetime import date, datetime, time + +from pyiceberg.avro import STRUCT_DOUBLE, STRUCT_FLOAT +from pyiceberg.io import OutputStream +from pyiceberg.utils.datetime import date_to_days, datetime_to_micros, time_object_to_micros + + +class BinaryEncoder: + """Write leaf values.""" + + _output_stream: OutputStream + + def __init__(self, output_stream: OutputStream) -> None: + self._output_stream = output_stream + + def write(self, b: bytes) -> None: + self._output_stream.write(b) + + def write_boolean(self, boolean: bool) -> None: + """A boolean is written as a single byte whose value is either 0 (false) or 1 (true). + + Args: + boolean: The boolean to write. + """ + self.write(bytearray([bool(boolean)])) + + def write_int(self, integer: int) -> None: + """Integer and long values are written using variable-length zig-zag coding.""" + datum = (integer << 1) ^ (integer >> 63) + while (datum & ~0x7F) != 0: + self.write(bytearray([(datum & 0x7F) | 0x80])) + datum >>= 7 + self.write(bytearray([datum])) + + def write_float(self, f: float) -> None: + """A float is written as 4 bytes.""" + self.write(STRUCT_FLOAT.pack(f)) + + def write_double(self, f: float) -> None: + """A double is written as 8 bytes.""" + self.write(STRUCT_DOUBLE.pack(f)) + + def write_decimal_bytes(self, datum: decimal.Decimal) -> None: + """ + Decimal in bytes are encoded as long. + + Since size of packed value in bytes for signed long is 8, 8 bytes are written. + """ + sign, digits, _ = datum.as_tuple() + + unscaled_datum = 0 + for digit in digits: + unscaled_datum = (unscaled_datum * 10) + digit + + bits_req = unscaled_datum.bit_length() + 1 + if sign: + unscaled_datum = (1 << bits_req) - unscaled_datum + + bytes_req = bits_req // 8 + padding_bits = ~((1 << bits_req) - 1) if sign else 0 + packed_bits = padding_bits | unscaled_datum + + bytes_req += 1 if (bytes_req << 3) < bits_req else 0 + self.write_int(bytes_req) + for index in range(bytes_req - 1, -1, -1): + bits_to_write = packed_bits >> (8 * index) + self.write(bytearray([bits_to_write & 0xFF])) + + def write_decimal_fixed(self, datum: decimal.Decimal, size: int) -> None: + """Decimal in fixed are encoded as size of fixed bytes.""" + sign, digits, _ = datum.as_tuple() + + unscaled_datum = 0 + for digit in digits: + unscaled_datum = (unscaled_datum * 10) + digit + + bits_req = unscaled_datum.bit_length() + 1 + size_in_bits = size * 8 + offset_bits = size_in_bits - bits_req + + mask = 2**size_in_bits - 1 + bit = 1 + for _ in range(bits_req): + mask ^= bit + bit <<= 1 + + if bits_req < 8: + bytes_req = 1 + else: + bytes_req = bits_req // 8 + if bits_req % 8 != 0: + bytes_req += 1 + if sign: + unscaled_datum = (1 << bits_req) - unscaled_datum + unscaled_datum = mask | unscaled_datum + for index in range(size - 1, -1, -1): + bits_to_write = unscaled_datum >> (8 * index) + self.write(bytearray([bits_to_write & 0xFF])) + else: + for _ in range(offset_bits // 8): + self.write(b"\x00") + for index in range(bytes_req - 1, -1, -1): + bits_to_write = unscaled_datum >> (8 * index) + self.write(bytearray([bits_to_write & 0xFF])) + + def write_bytes(self, b: bytes) -> None: + """Bytes are encoded as a long followed by that many bytes of data.""" + self.write_int(len(b)) + self.write(struct.pack(f"{len(b)}s", b)) + + def write_bytes_fixed(self, b: bytes) -> None: + """Writes fixed number of bytes.""" + self.write(struct.pack(f"{len(b)}s", b)) + + def write_utf8(self, s: str) -> None: + """A string is encoded as a long followed by that many bytes of UTF-8 encoded character data.""" + self.write_bytes(s.encode("utf-8")) + + def write_date_int(self, d: date) -> None: Review Comment: Why not simply `write_date`? -- This is an automated message from the Apache Git Service. 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