Databricks Certified Associate Developer for Apache Spark — Question 85

The code block shown below contains an error. The code block is intended to return a new DataFrame that is the result of a position-wise union between DataFrame storesDF and DataFrame acquiredStoresDF.

Answer options

• A. concat(storesDF, acquiredStoresDF)
• B. storesDF.unionByName(acquiredStoresDF)
• C. union(storesDF, acquiredStoresDF)
• D. unionAll(storesDF, acquiredStoresDF)
• E. storesDF.union(acquiredStoresDF)

Correct answer: E

Explanation

The correct answer is E because the union method is specifically designed for combining DataFrames in a compatible way. The other options either do not exist or do not perform the intended position-wise union as required.