input_file_block_start()

Описание

Функция input_file_block_start() возвращает начальную позицию текущего блока входного файла в байтах.

Параметры

Функция не принимает параметров.

Возвращаемое значение

Long - начальная позиция текущего блока входного файла в байтах

Пример использования

from pyspark.sql.functions import input_file_block_start
from pyspark.sql import SparkSession

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

# Читаем файл и получаем начальную позицию блока
df = spark.read.text("path/to/file.txt")
result = df.select(input_file_block_start().alias("block_start")).show()

# Результат:
# +------------+
# |block_start|
# +------------+
# |0          |
# +------------+

Примечания

• Возвращает позицию блока только при чтении файлов
• Для работы с файлами также используйте:
• input_file_block_length() для получения длины блока
• input_file_name() для получения имени входного файла

XML функции

• from_xml(col, schema)
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• to_xml(col)

aggregate functions

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basic functions

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bitmap functions

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bitwise functions

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call functions

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comparison functions

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conditional functions

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conversion functions

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csv functions

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datetime functions pyspark

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encryption functions

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expression functions

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hash functions

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java functions

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json functions

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map functions

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mathematical functions pyspark

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normal functions

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null functions

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sketch functions

• hll_sketch_estimate(sketch)
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sort functions

• asc(col)
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string functions pyspark

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• url_decode(str)
• url_encode(str)
• uuid()

struct functions

• named_struct(name1, val1, name2, val2, ...)

system functions

• current_catalog()
• current_database()
• current_schema()
• current_user()
• input_file_block_length()
• input_file_name()
• spark_partition_id()
• user()

type functions

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window functions

• cume_dist()
• dense_rank()
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• row_number()
• window(timeColumn, windowDuration, slideDuration, startTime)

xml functions

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• xpath_short(xml, path)
• xpath_string(xml, path)

агрегатные функции

• approx_count_distinct(col, rsd)
• std(col)
• sumDistinct(col)

битовые операции

• bitwise_and(col1, col2)

оконные функции

• diff(col)
• session_window(timeColumn, gapDuration)
• sliding_window(timeColumn, windowDuration, slideDuration)
• tumbling_window(timeColumn, windowDuration)

операторы сравнения

• <>(left, right)
• <=>(left, right)
• =(left, right)

предикатные функции

• isnotnan(col)

системные функции

• database()
• session_user()

условные функции

• case_when(condition1, value1, condition2, value2, ..., else_value)
• if(condition, value1, value2)

функции для работы с битовыми картами

• bitmap_bit_position(bitmap, bit)
• bitmap_bucket_number(bitmap)

функции преобразования типов

• to_decimal(col, scale=0)

функции шифрования

• aes_decrypt(col, key)