Câu 43: Databricks Certified Associate Developer for Apache Spark

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. Identify the error. Code block:storesDF.unionByName(acquiredStoresDF)

1. A. There is no DataFrame.unionByName() operation – the concat() operation should be used instead with both DataFrames as arguments.
2. B. There are no key columns specified – similar column names should be the second argument.
3. C. The DataFrame.unionByName() operation does not union DataFrames based on column position – it uses column name instead. — đáp án hiện tại
4. D. The unionByName() operation is a standalone operation rather than a method of DataFrame – it should have both DataFrames as arguments.
5. E. There are no column positions specified – the desired column positions should be the second argument.