private ArrayList<Var> getActualCallParameters(HplsqlParser.Expr_func_paramsContext actual) {
    if (actual == null || actual.func_param() == null) {
      return null;
    }
    int cnt = actual.func_param().size();
    ArrayList<Var> values = new ArrayList<>(cnt);
    for (int i = 0; i < cnt; i++) {
      values.add(evalPop(actual.func_param(i).expr()));
    }
    return values;
  }
Execute a stored procedure using CALL or EXEC statement passing parameters
hplsql/src/main/java/org/apache/hive/hplsql/functions/HmsFunctionRegistry.java