Apache Spark ( pyspark ) - 将二进制转换为 str ( UUID )，无需 UDF

Question

我无法找到一种在不使用 UDF 的情况下将二进制转换为字符串表示形式的方法

有没有一种方法可以使用原生 Spark 函数而不是 UDF ？

from pyspark.sql import DataFrame, SparkSession
import pyspark.sql.functions as F
import uuid
from pyspark.sql.types import Row, StringType

spark_test_instance = (SparkSession
                       .builder
                       .master('local')
                       .getOrCreate())
df: DataFrame = spark_test_instance().createDataFrame([Row()])

df = df.withColumn("id", F.lit(uuid.uuid4().bytes))
df = df.withColumn("length", F.length(df["id"]))

uuidbytes_to_str = F.udf(lambda x: str(uuid.UUID(bytes=bytes(x), version=4)), StringType())

df = df.withColumn("id_str", uuidbytes_to_str(df["id"]))
df = df.withColumn("length_str", F.length(df["id_str"]))

df.printSchema()
df.show(1, truncate=False)

给予

root
 |-- id: binary (nullable = false)
 |-- length: integer (nullable = false)
 |-- id_str: string (nullable = true)
 |-- length_str: integer (nullable = false)

+-------------------------------------------------+------+------------------------------------+----------+
|id                                               |length|id_str                              |length_str|
+-------------------------------------------------+------+------------------------------------+----------+
|[0A 35 DC 67 13 C8 47 7E B0 80 9F AB 98 CA FA 89]|16    |0a35dc67-13c8-477e-b080-9fab98cafa89|36        |
+-------------------------------------------------+------+------------------------------------+----------+

Answer 1

您可以使用

hex

来获取

id_str

:

from pyspark.sql import SparkSession
import pyspark.sql.functions as F
import uuid

spark = SparkSession.builder.getOrCreate()

data = [(uuid.uuid4().bytes,)]

df = spark.createDataFrame(data, ["id"])

df = df.withColumn("id_str", F.hex("id"))

df.show(truncate=False)

# +-------------------------------------------------+--------------------------------+
# |id                                               |id_str                          |
# +-------------------------------------------------+--------------------------------+
# |[7E CA 09 3C F3 4D 49 1C 82 30 CB 98 CB 56 74 14]|7ECA093CF34D491C8230CB98CB567414|
# +-------------------------------------------------+--------------------------------+