Explanation:
The error message indicates an ambiguous reference to the medal column, which means this column exists in both DataFrames being joined (medalDf and df). When all columns from both DataFrames are selected after joining, the medal column appears twice. Attempting to select the medal column then results in ambiguity because Spark cannot determine which instance of the column to use.
For more information, refer to the documentation on Ambiguous Reference errors in Spark.
Ultimate access to all questions.
While executing your code, you encounter the following error message. What could be the potential cause of this error?
A
The right_outer join operation is not supported in Spark.
B
Using multiple select operations in a single line of code is not allowed.
C
Selecting all columns from both DataFrames is not permitted.
D
The medal column is present in both DataFrames, causing ambiguity.
E
The medal column does not exist in any of the DataFrames involved in the join.
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