【programming pig】preliminary matters

本文主要是介绍【programming pig】preliminary matters，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1. pig中relation名字和field名字不能重新赋值，因为会造成引用丢失

you can write as follows,

A = load 'NYSE_dividends' (exchange, symbol, date, dividends);

A = filter A by dividends > 0;

A = foreach A generate UPPER(symbol);

However, it is not recommended. It looks here as if you are reassigning A, but really
you are creating new relations called A, losing track of the old relations called A.

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