Python PySpark查找一列中的模式是否存在于另一列中
我有两个pyspark数据帧。一个包含FullAddress字段(如col1),另一个数据框在其中一列(如col2)中包含城市/城镇/郊区的名称。我想比较col2和col1,如果有匹配的话返回col2 此外,郊区名称可以是郊区名称的列表 包含完整地址的Dataframe1 我想要这样的Python PySpark查找一列中的模式是否存在于另一列中,python,apache-spark,dataframe,pyspark,Python,Apache Spark,Dataframe,Pyspark,我有两个pyspark数据帧。一个包含FullAddress字段(如col1),另一个数据框在其中一列(如col2)中包含城市/城镇/郊区的名称。我想比较col2和col1,如果有匹配的话返回col2 此外,郊区名称可以是郊区名称的列表 包含完整地址的Dataframe1 我想要这样的 +-----------------------------------------------------------++-----------+ |FullAddress
+-----------------------------------------------------------++-----------+
|FullAddress |suburb |
+-----------------------------------------------------------++-----------+
|BADAJOZ ROAD NORTH RYDE 2113, NSW, Australia |NORTH RYDE |
| HAY STREET HAYMARKET 2000, NSW, Australia |HAYMARKET |
| SMART STREET FAIRFIELD 2165, NSW, Australia |NULL |
|CLARENCE STREET SYDNEY 2000, NSW, Australia |SYDNEY |
+-----------------------------------------------------------++-----------+
有两个
数据帧
-
数据帧1:包含完整地址的数据帧
数据框2:数据框
包含基本数据-邮政编码
,地区
&城市/城镇/郊区
df_City_Town_Suburb = sqlContext.createDataFrame([(2000,'Sydney','Dawes Point, Haymarket, Millers Point, Sydney, The Rocks'),
(2001,'Sydney','Sydney'),(2113,'Sydney','North Ryde')],
('Postcode','District','City_Town_Suburb'))
df_City_Town_Suburb.show(truncate=False)
+--------+--------+--------------------------------------------------------+
|Postcode|District|City_Town_Suburb |
+--------+--------+--------------------------------------------------------+
|2000 |Sydney |Dawes Point, Haymarket, Millers Point, Sydney, The Rocks|
|2001 |Sydney |Sydney |
|2113 |Sydney |North Ryde |
+--------+--------+--------------------------------------------------------+
该问题的目的是从DataFrame 2
中为DataFrame 1
提取适当的。虽然OP没有明确指定可以连接两个数据帧的键
,但是邮政编码
似乎只是合理的选择
# Importing requisite functions
from pyspark.sql.functions import col,regexp_extract,split,udf
from pyspark.sql.types import StringType
让我们将数据帧1
创建为df
。在这个DataFrame
中,我们需要提取Postcode
。在澳大利亚,所有邮政编码都是,因此我们使用从字符串
列中提取4位数字
df = sqlContext.createDataFrame([('BADAJOZ ROAD NORTH RYDE 2113, NSW, Australia ',),
('HAY STREET HAYMARKET 2000, NSW, Australia',),
('SMART STREET FAIRFIELD 2165, NSW, Australia',),
('CLARENCE STREET SYDNEY 2000, NSW, Australia',)],
('FullAddress',))
df = df.withColumn('Postcode', regexp_extract('FullAddress', "(\\d{4})" , 1 ))
df.show(truncate=False)
+---------------------------------------------+--------+
|FullAddress |Postcode|
+---------------------------------------------+--------+
|BADAJOZ ROAD NORTH RYDE 2113, NSW, Australia |2113 |
|HAY STREET HAYMARKET 2000, NSW, Australia |2000 |
|SMART STREET FAIRFIELD 2165, NSW, Australia |2165 |
|CLARENCE STREET SYDNEY 2000, NSW, Australia |2000 |
+---------------------------------------------+--------+
现在,我们已经提取了邮政编码
,我们已经创建了键
来连接两个数据帧
。让我们创建数据帧2
,我们需要从中提取相应的数据帧
df_City_Town_Suburb = sqlContext.createDataFrame([(2000,'Sydney','Dawes Point, Haymarket, Millers Point, Sydney, The Rocks'),
(2001,'Sydney','Sydney'),(2113,'Sydney','North Ryde')],
('Postcode','District','City_Town_Suburb'))
df_City_Town_Suburb.show(truncate=False)
+--------+--------+--------------------------------------------------------+
|Postcode|District|City_Town_Suburb |
+--------+--------+--------------------------------------------------------+
|2000 |Sydney |Dawes Point, Haymarket, Millers Point, Sydney, The Rocks|
|2001 |Sydney |Sydney |
|2113 |Sydney |North Ryde |
+--------+--------+--------------------------------------------------------+
将两个数据帧
与左
连接-
df = df.join(df_City_Town_Suburb.select('Postcode','City_Town_Suburb'), ['Postcode'],how='left')
df.show(truncate=False)
+--------+---------------------------------------------+--------------------------------------------------------+
|Postcode|FullAddress |City_Town_Suburb |
+--------+---------------------------------------------+--------------------------------------------------------+
|2113 |BADAJOZ ROAD NORTH RYDE 2113, NSW, Australia |North Ryde |
|2165 |SMART STREET FAIRFIELD 2165, NSW, Australia |null |
|2000 |HAY STREET HAYMARKET 2000, NSW, Australia |Dawes Point, Haymarket, Millers Point, Sydney, The Rocks|
|2000 |CLARENCE STREET SYDNEY 2000, NSW, Australia |Dawes Point, Haymarket, Millers Point, Sydney, The Rocks|
+--------+---------------------------------------------+--------------------------------------------------------+
使用函数将列City\u Town\u郊区
拆分为一个数组-
df = df.select('Postcode','FullAddress',split(col("City_Town_Suburb"), ",\s*").alias("City_Town_Suburb"))
df.show(truncate=False)
+--------+---------------------------------------------+----------------------------------------------------------+
|Postcode|FullAddress |City_Town_Suburb |
+--------+---------------------------------------------+----------------------------------------------------------+
|2113 |BADAJOZ ROAD NORTH RYDE 2113, NSW, Australia |[North Ryde] |
|2165 |SMART STREET FAIRFIELD 2165, NSW, Australia |null |
|2000 |HAY STREET HAYMARKET 2000, NSW, Australia |[Dawes Point, Haymarket, Millers Point, Sydney, The Rocks]|
|2000 |CLARENCE STREET SYDNEY 2000, NSW, Australia |[Dawes Point, Haymarket, Millers Point, Sydney, The Rocks]|
+--------+---------------------------------------------+----------------------------------------------------------+
最后创建一个数组,检查数组的每个元素City\u Town\u郊区
是否存在于列FullAddress
中。如果存在一个,我们立即返回它,否则None
返回
def suburb(FullAddress,City_Town_Suburb):
# Check for the case where there is no Array, otherwise we will get an Error
if City_Town_Suburb == None:
return None
# Checking each and every Array element if it exists in 'FullAddress',
# and if a match is found, it's immediately returned.
for sub in City_Town_Suburb:
if sub.strip().upper() in FullAddress:
return sub.upper()
return None
suburb_udf = udf(suburb,StringType())
应用此自定义项
df = df.withColumn('suburb', suburb_udf(col('FullAddress'),col('City_Town_Suburb'))).drop('City_Town_Suburb')
df.show(truncate=False)
+--------+---------------------------------------------+----------+
|Postcode|FullAddress |suburb |
+--------+---------------------------------------------+----------+
|2113 |BADAJOZ ROAD NORTH RYDE 2113, NSW, Australia |NORTH RYDE|
|2165 |SMART STREET FAIRFIELD 2165, NSW, Australia |null |
|2000 |HAY STREET HAYMARKET 2000, NSW, Australia |HAYMARKET |
|2000 |CLARENCE STREET SYDNEY 2000, NSW, Australia |SYDNEY |
+--------+---------------------------------------------+----------+
您需要加入邮政编码上的数据帧吗?