In this code snippet, we create a DataFramedfwith two columns: “name” of type StringType and “age” of type StringType. Let’s say we want to change the data type of the “age” column from StringType to IntegerType. We can do this using thecast()function: df=df.withColumn("age...
col("gender").alias("gender"), col("salary").alias("salary"), when(col("salary").cast(IntegerType()) < 2000,"Low") .when(col("salary").cast(IntegerType()) < 4000,"Medium") .otherwise("High").alias("Salary_Grade") )).drop("id","gender","salary") updatedDF.printSchema() ...
要将age列的数据类型从 integer 改为 double,我们可以使用 Spark 中的cast方法。我们需要从pyspark.types:导入DoubleType [In]:frompyspark.sql.typesimportStringType,DoubleType [In]: df.withColumn('age_double',df['age'].cast(DoubleType())).show(10,False) [Out]: 因此,上面的命令创建了一个新列(ag...
可以使用cast函数进行数据类型转换。 python from pyspark.sql.functions import col, cast # 将某列的数据类型转换为整数类型 df_with_cast = df.withColumn("column_name", cast(col("column_name"), "integer")) 4. 筛选和过滤数据 筛选和过滤数据是数据预处理中的常见操作,可以使用select、filter和where...
# add a new column data = data.withColumn("newCol",df.oldCol+1) # replace the old column data = data.withColumn("oldCol",newCol) # rename the column data.withColumnRenamed("oldName","newName") # change column data type data.withColumn("oldColumn", data.oldColumn.cast("integer")) (...
'revenue']date_vars=['release_date']#Converting integer variablesforcolumninint_vars:df=df.withColumn(column,df[column].cast(IntegerType()))forcolumninfloat_vars:df=df.withColumn(column,df[column].cast(FloatType()))forcolumnindate_vars:df=df.withColumn(column,df[column].cast(DateType()))...
StructField("salary",IntegerType(),True)\])df=spark.createDataFrame(data=data,schema=schema)df.printSchema()df.show(truncate=False) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21.
# convert row to dict: row_dict = row.asDict() # Add a new key in the dictionary with the new column name and value. row_dict['Newcol'] = math.exp(row_dict['rating']) # convert dict to row: newrow = Row(**row_dict) ...
问在Pyspark中将布尔值转换为字符串时使用when和valuesEN版权声明：本文内容由互联网用户自发贡献，该文...
root|--name:struct(nullable=true)||--firstname:string(nullable=true)||--middlename:string(nullable=true)||--lastname:string(nullable=true)|--id:string(nullable=true)|--gender:string(nullable=true)|--salary:integer(nullable=true)+---+---+---+---+|name|id|gender|salary|+---+---...