Certified Associate Developer for Apache Spark Exam

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Question 101

The code block shown below contains an error. The code block is intended to return a collection of summary statistics for column sqft in Data Frame storesDF. Identify the error.

Code block:

storesDF.describes(col(“sgft”))

The column sqft should be subsetted from DataFrame storesDF prior to computing summary statistics on it alone.

The describe() operation does not accept a Column object as an argument outside of a sequence — the sequence Seq(col(“sqft”)) should be specified instead.

The describe()operation doesn’t compute summary statistics for a single column — the summary() operation should be used instead.

The describe()operation doesn't compute summary statistics for numeric columns — the summary() operation should be used instead.

The describe()operation does not accept a Column object as an argument — the column name string “sqft” should be specified instead.

Correct Answer: E

The error in the code block is that the describe() operation does not accept a Column object as an argument. Instead, you should specify the column name as a string directly. The corrected code should be storesDF.describe('sqft').

Discussion

SaiPavan10Option: E

E is the right choice.

Sowwy1Option: E

I think it's E. It should be storesDF.describe("sqft")