Apache pig 如何简化相同的方法调用
你好,我有以下清管器代码:Apache pig 如何简化相同的方法调用,apache-pig,Apache Pig,你好,我有以下清管器代码: leafNodes = FOREACH records GENERATE 'buckets' AS bucket_url, MultiConcat(localziedName, ' in ', localizedLocation) AS title, ToJSONString( 'url', url, 'title', MultiConcat(localziedName, ' in ', localizedLocation) )
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
multiccat(localziedName,'in',localizedLocation)
调用进行了两次。那么,有没有一种方法可以使用variable或类似的东西将调用减少到一次呢?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。代码如下:
leafNodes = FOREACH records {
title = MultiConcat(localziedName, ' in ', localizedLocation);
GENERATE
'buckets' AS bucket_url,
title,
ToJSONString(
'url', url,
'title', title
) AS link_json;
}
你试过用title替换第二个电话吗?是的,我试过了。它不起作用。