我在pyspark数据框中有一个StringType()列和一个ArrayType(StringType())列。我想将ArrayType(StringType())列的每个元素与StringType()列连接。
示例:
+-----+---------------------+------------------------------+
|col1 |col2 |col3 |
+-----+---------------------+------------------------------+
|'AQQ'|['ABC', 'DEF'] |['AQQABC', 'AQQDEF'] |
|'APP'|['ABC', 'DEF', 'GHI']|['APPABC', 'APPDEF', 'APPGHI']|
+-----+---------------------+------------------------------+
谢谢:)
答案 0 :(得分:1)
对于Spark 2.4+,请使用transform:
from pyspark.sql.functions import expr
df = spark.createDataFrame([('AQQ', ['ABC', 'DEF']),('APP', ['ABC', 'DEF', 'GHI'])], ['col1', 'col2'])
df.withColumn('col3', expr("transform(col2, x -> concat(col1, x))")).show(truncate=False)
+----+---------------+------------------------+
|col1|col2 |col3 |
+----+---------------+------------------------+
|AQQ |[ABC, DEF] |[AQQABC, AQQDEF] |
|APP |[ABC, DEF, GHI]|[APPABC, APPDEF, APPGHI]|
+----+---------------+------------------------+