//getting results
List<Expression> listExpr = instance.getExprList();
List<OrExpression> orListExpr = instance.getOrExprs();
//expected results
Table tableN1 = new Table(); tableN1.setName("N1");
Table tableN2 = new Table(); tableN2.setName("N2");
Table tableLineitem = new Table(); tableLineitem.setName("LINEITEM");
Column se1 = new Column(); se1.setTable(tableN1); se1.setColumnName("NAME");
Column se2 = new Column(); se2.setTable(tableN2); se2.setColumnName("NAME");
Column ls = new Column(); ls.setTable(tableLineitem); ls.setColumnName("SHIPDATE");
ExpressionList el = new ExpressionList();