max_column_df=find_max_column(df,["Sales_Q1","Sales_Q2","Sales_Q3"])print(max_column_df) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 5. 提取最大列名 通过对每行的最大值进行比较,我们可以得出每一行的最大列名。 max_columns=[]forrowindf.collect():max_value=max(row[1:])max_index=r...
from pyspark.sql.functions import udf from pyspark.sql.types import StringType def array_to_string(my_list): return '[' + ','.join([str(elem) for elem in my_list]) + ']' array_to_string_udf = udf(array_to_string, StringType()) df = df.withColumn('column_as_str', array_to_...
[In]: df.filter(df['mobile']=='Vivo').filter(df['experience'] >10).show() [Out]: 为了将这些条件应用于各个列,我们使用了多个筛选函数。还有另一种方法可以达到同样的效果,如下所述。 [In]: df.filter((df['mobile']=='Vivo')&(df['experience'] >10)).show() [Out]: 列中的不同值 ...
You shouldn't need to use exlode, that will create a new row for each value in the array. The reason max isn't working for your dataframe is because it is trying to find the max for that column for every row in you dataframe and not just the max in the array. ...
The StringIndexer assigns a unique index to each distinct string value in the input column and maps it to a new output column of integer indices. How the StringIndexer works? The StringIndexer processes the input column’s string values based on their frequency in the dataset. By default, the...
SPARK-30569-* 添加调用percentage_approx的DSL函数 *
These arguments can either be the column name as a string (one for each column) or a column object (using the df.colName syntax). When you pass a column object, you can perform operations like addition or subtraction on the column to change the data contained in it, much like inside ...
Partition by a Column Value Range Partition a DataFrame Change Number of DataFrame Partitions Coalesce DataFrame partitions Set the number of shuffle partitions Sample a subset of a DataFrame Run multiple concurrent jobs in different pools Print Spark configuration properties Set Spark configuration properti...
进程会通过GrpID分组,每个组内有多个进程,需要计算的是各组VALUE值的总的变化量。...粗看起来这个问题似乎很简单,因为数据量并不是很大,可以首先LOAD整个数据集,然后按照PID分组,在分组内对TIMESTAMP时间排序,计算最后一个与第一个VALUE的差值,然后再对GrpID分组将刚才计算出来的差值求和即可...[1502345407840_4827...
SPARK-30569-* 添加调用percentage_approx的DSL函数 *