[英]PySpark org.apache.spark.sql.AnalysisException: Table or view not found:
[英]Does pyspark have an equivalent of org.apache.spark.functions.transform?
org.apache.spark.functions.transform applies a function to each element of an array (new in spark 3.0) However, the pyspark docs don't mention an equivalent function
(有 pyspark.sql.DataFrame.transform - 但它用於轉換數據幀,而不是數組元素)
編輯:
為避免 UDF,您可以使用 F.expr('transform...'):
import pyspark.sql.functions as F
from pyspark.sql.types import IntegerType
df = spark.createDataFrame([[[1,2]],[[3,4]]]).toDF('col')
df.show()
+------+
| col|
+------+
|[1, 2]|
|[3, 4]|
+------+
df.select(F.expr('transform(col, x -> x+1)').alias('transform')).show()
+---------+
|transform|
+---------+
| [2, 3]|
| [4, 5]|
+---------+
老答案:
IIUC,我認為相當於UDF。 x+1
是要應用的 function。
import pyspark.sql.functions as F
from pyspark.sql.types import IntegerType
add = F.udf(lambda arr: [x+1 for x in arr], ArrayType(IntegerType()))
df.select(add('col')).show()
+-------------+
|<lambda>(col)|
+-------------+
| [2, 3]|
| [4, 5]|
+-------------+
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.