presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitSetSession
class AstBuilder:    @Override
    public Node visitSetSession(SqlBaseParser.SetSessionContext context)
    {
        return new SetSession(getLocation(context), getQualifiedName(context.qualifiedName()), (Expression) visit(context.expression()));
    }