bitmap_bit_position(bitmap, bit)

Описание

Функция bitmap_bit_position() возвращает позицию указанного бита в битовой карте.

Параметры

• bitmap: Column - битовая карта
• bit: Column - бит, позицию которого нужно найти

Возвращаемое значение

Column - позиция бита в битовой карте (тип Integer)

Пример использования

from pyspark.sql.functions import bitmap_bit_position, lit
from pyspark.sql import SparkSession

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

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

# Находим позиции битов
result = df.withColumn(
    "bit_1_position",
    bitmap_bit_position("bitmap", lit(1))
).withColumn(
    "bit_0_position",
    bitmap_bit_position("bitmap", lit(0))
)
result.show(truncate=False)

# Результат:
# +------+---------------+---------------+
# |bitmap|bit_1_position|bit_0_position|
# +------+---------------+---------------+
# |10    |1             |0             |
# |12    |2             |0             |
# +------+---------------+---------------+

Примечания

• Возвращает NULL, если битовая карта NULL
• Позиции нумеруются с 0
• Полезно для:
• Анализа битовых карт
• Поиска установленных битов
• Работы с битовыми масками
• Связанные функции:
• bitmap_bucket_number() - номер корзины битовой карты
• bitmap_count() - подсчет установленных битов

XML функции

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basic functions

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bitmap functions

• bitmap_construct_agg(col)
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bitwise functions

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агрегатные функции

• approx_count_distinct(col, rsd)
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битовые операции

• bitwise_and(col1, col2)

оконные функции

• diff(col)
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операторы сравнения

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предикатные функции

• isnotnan(col)

системные функции

• database()
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условные функции

• case_when(condition1, value1, condition2, value2, ..., else_value)
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функции для работы с битовыми картами

• bitmap_bucket_number(bitmap)

функции преобразования типов

• to_decimal(col, scale=0)

функции шифрования

• aes_decrypt(col, key)