Databricks Certified Associate Developer for Apache Spark
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Identify and correct the error in the following code block, which is intended to perform a position-wise union between DataFrames storesDF and acquiredStoresDF:
# Current code with potential error
storesDF.unionByName(acquiredStoresDF)
# Current code with potential error
storesDF.unionByName(acquiredStoresDF)
A
There is no DataFrame.unionByName() operation – the concat() operation should be used instead with both DataFrames as arguments.
B
There are no key columns specified – similar column names should be the second argument.
C
The DataFrame.unionByName() operation does not union DataFrames based on column position – it uses column name instead.
D
The unionByName() operation is a standalone operation rather than a method of DataFrame – it should have both DataFrames as arguments.
E
There are no column positions specified – the desired column positions should be the second argument.