How can I retrieve the alias for a DataFrame in Spark

Question

I\'m using Spark 2.0.2. I have a DataFrame that has an alias on it, and I\'d like to be able to retrieve that. A simplified example of why I\'d want that is below.

Answer 1

For Java:

As @veinhorn mentioned, it is also possible to get the alias in Java. Here is a utility method example:

public static  Optional getAlias(Dataset dataset){
    final LogicalPlan analyzed = dataset.queryExecution().analyzed();
    if(analyzed instanceof SubqueryAlias) {
        SubqueryAlias subqueryAlias = (SubqueryAlias) analyzed;
        return Optional.of(subqueryAlias.alias());
    }
    return Optional.empty();
}