bitmap_bucket_number(bitmap)

Описание

Функция bitmap_bucket_number() возвращает номер корзины (bucket) для битовой карты.

Параметры

• bitmap: Column - битовая карта

Возвращаемое значение

Column - номер корзины битовой карты (тип Integer)

Пример использования

from pyspark.sql.functions import bitmap_bucket_number
from pyspark.sql import SparkSession

# Создаем SparkSession
spark = SparkSession.builder.appName("bitmap_bucket_number_example").getOrCreate()

# Создаем DataFrame с битовыми картами
data = [
    (0b1010,),  # 10 в двоичном виде
    (0b1100,),  # 12 в двоичном виде
    (0b1111,)   # 15 в двоичном виде
]
df = spark.createDataFrame(data, ["bitmap"])

# Получаем номера корзин
result = df.withColumn(
    "bucket_number",
    bitmap_bucket_number("bitmap")
)
result.show(truncate=False)

# Результат:
# +------+-------------+
# |bitmap|bucket_number|
# +------+-------------+
# |10    |0            |
# |12    |0            |
# |15    |0            |
# +------+-------------+

Примечания

• Возвращает NULL, если битовая карта NULL
• Номер корзины используется для оптимизации хранения и обработки битовых карт
• Полезно для:
• Оптимизации хранения битовых карт
• Группировки битовых карт
• Эффективной обработки больших наборов битовых карт
• Связанные функции:
• bitmap_bit_position() - позиция бита в карте
• bitmap_count() - подсчет установленных битов

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bitmap functions

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агрегатные функции

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битовые операции

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оконные функции

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операторы сравнения

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предикатные функции

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условные функции

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функции для работы с битовыми картами

• bitmap_bit_position(bitmap, bit)

функции преобразования типов

• to_decimal(col, scale=0)

функции шифрования

• aes_decrypt(col, key)