Databricks Certified Associate Developer for Apache Spark — Question 68

The code block shown below contains an error. The code block is intended to print the schema of DataFrame storesDF. Identify the error.

Code block:

storesDF.printSchema.getAs[String]

Answer options

• A. There is no printSchema member of DataFrame – the getSchema() operation should be used instead.
• B. There is no printSchema member of DataFrame – the schema() operation should be used instead.
• C. The entire line needs to be a string – it should be wrapped by str().
• D. The printSchema member of DataFrame is an operation prints the DataFrame – there is no need to call getAs.
• E. There is no printSchema member of DataFrame – schema and the print() function should be used instead.

Correct answer: D

Explanation

The correct answer is D because printSchema is indeed a method that prints the DataFrame's schema directly, and there's no need for the getAs method. Options A, B, and E incorrectly state that printSchema is non-existent and suggest alternative methods that are not applicable in this context, while option C incorrectly suggests that the entire line should be treated as a string.