如何简化相同的方法调用

Question

您好，我有以下 Pig 代码：

leafNodes = FOREACH records GENERATE
  'buckets' AS bucket_url,
  MultiConcat(localziedName, ' in ', localizedLocation) AS title,
  ToJSONString(
      'url', url,
      'title', MultiConcat(localziedName, ' in ', localizedLocation)
  ) AS link_json;

相同的 MultiConcat(localziedName, ' in ', localizedLocation) 调用进行了两次。那么，有没有办法使用变量或类似的东西来减少一次调用？

Answer 1

我找到了一种方法。基本上，只需在 GENERATE 语句之前创建一个变量。这是代码：

leafNodes = FOREACH records {
  title = MultiConcat(localziedName, ' in ', localizedLocation);
  GENERATE
  'buckets' AS bucket_url,
  title,
  ToJSONString(
      'url', url,
      'title', title
  ) AS link_json;
}

如何简化相同的方法调用

How to simplify identical method call

apache-pig