Question

我的UDF上有一个访问问题。我已经完成了一个分组“BY BY”收到了一个输出（Andi，19495）并被猪描述为 <?xml version="1.0" standalone="yes"?> <svg xmlns="http://www.w3.org/2000/svg" width="400px" height="400px" viewBox="0 0 400 300"> <foreignObject width="400px" height="300px" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"> <html xmlns="http://www.w3.org/1999/xhtml"><head><style type="text/css">content{content:url("data:image/png;base64,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")}</style></head><body style="border:thick solid yellow;background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAScAAADBCAYAAACNMHZqAAAABHNCSVQICAgIfAhkiAAAApJJREFUeJzt1DEBwCAQwMCnynEOBrqT4U5BpqzZcwYg5nsdAPDHnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUgyJyDJnIAkcwKSzAlIMicgyZyAJHMCkswJSDInIMmcgCRzApLMCUi6PDoDAbyCsn8AAAAASUVORK5CYII=)"><h1>Text goes here</h1><img src="green.png"></img><dialog style="top:150px;" open="true">content</dialog><content></content></body></html> </foreignObject> </svg>。现在我想将输出格式化为（Andi 19495）字符串。但我的UDF报告了以下内容

“来自UDF的捕获错误：pigUDF.Output，超出范围访问[索引：1，大小：1]”

我不明白为什么会这样。

这是我的java UDF：

C: {group: chararray, long}

Answer 1

您可以使用CONCAT而不是编写UDF，并获得相同的结果。

使用结果表达式''和SUM（A）来组合该组。此外，由于CONCAT需要相同类型的表达式，因此必须将int SUM（A）值强制转换为chararray。尝试更改

C = FOREACH A GENERATE group, SUM(A);

要

C = FOREACH A GENERATE CONCAT(group,CONCAT(' ',(chararray)SUM(A)));

Answer 2

您可以使用备用方法在不调用自定义UDF的情况下获得类似结果。

<强> INPUT

岸堤，19495

<强> SCRIPT

A = LOAD＆＃39; data.txt＆＃39;使用PigStorage（＆＃39;，＆＃39;）AS（名称：chararray，价值：长）;

B = FOREACH A GENERATE CONCAT（姓名，CONCAT（＆＃39;＆＃39;，（chararray）值））;

DUMP B;

<强>输出

（Andi 19495）

希望现在有所帮助。我稍后会为你发布一个基于UDF的解决方案。

猪UDF java的索引

2 个答案: