Question

如何为结果创建新字段？

我正在使用wordcount作业，我想附加一个时间戳。目前它包含字段'word'和'count'。

我的目标是创建一个如下所示的元组： 'word''count''timestamp'

到目前为止，这是我的代码。我尝试将时间戳附加到名为“TimestampAppender”

的自定义函数中

wcPipe = new Each(wcPipe, Fields.ALL, new TimestampAppender(Fields.ALL), Fields.RESULTS);

TimestampAppender：

public class TimestampAppender extends BaseOperation implements Function {
  public TimestampAppender(Fields fieldDeclaration) {
    super(2, fieldDeclaration);
}

public void operate(FlowProcess flowProcess, FunctionCall functionCall) {
    TupleEntry argument = functionCall.getArguments();

    String arg0 = argument.getString(0);
    String arg1 = argument.getString(1);

    Tuple result = new Tuple();
    result.addString(arg0);
    result.addString(arg1);
    result.addString("01-01-2015");

    functionCall.getOutputCollector().add(result);
}

Answer 1

您可以将代码更改为：

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<link type="text/css" rel="stylesheet" href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css" />
<div class="title">Column 1</div>
<div id="sortable1" class="connectedSortable">
    <div class="ui-state-default">Item 1</div>
    <div class="ui-state-default">Item 2</div>
    <div class="ui-state-default">Item 3</div>
    <div class="ui-state-default">Item 4</div>
    <div class="ui-state-default">Item 5</div>
    <div class="ui-state-default">Item 6</div>
    <div class="ui-state-default">Item 7</div>
    <div class="ui-state-default">Item 8</div>
    <div class="ui-state-default">Item 9</div>
    <div class="ui-state-default">Item 10</div>
</div>
<div class="title">Column 2</div>
<div id="sortable2" class="connectedSortable">
    <div class="ui-state-highlight">Item A</div>
    <div class="ui-state-highlight">Item B</div>
    <div class="ui-state-highlight">Item C</div>
    <div class="ui-state-highlight">Item D</div>
    <div class="ui-state-highlight">Item E</div>
    <div class="ui-state-highlight">Item F</div>
    <div class="ui-state-highlight">Item G</div>
    <div class="ui-state-highlight">Item H</div>
    <div class="ui-state-highlight">Item I</div>
    <div class="ui-state-highlight">Item J</div>
    <div class="ui-state-highlight">Item K</div>
    <div class="ui-state-highlight">Item L</div>
    <div class="ui-state-highlight">Item M</div>
    <div class="ui-state-highlight">Item N</div>
    <div class="ui-state-highlight">Item O</div>
    <div class="ui-state-highlight">Item P</div>
    <div class="ui-state-highlight">Item Q</div>
    <div class="ui-state-highlight">Item R</div>
    <div class="ui-state-highlight">Item S</div>
    <div class="ui-state-highlight">Item T</div>
    <div class="ui-state-highlight">Item U</div>
    <div class="ui-state-highlight">Item V</div>
    <div class="ui-state-highlight">Item W</div>
    <div class="ui-state-highlight">Item X</div>
    <div class="ui-state-highlight">Item Y</div>
    <div class="ui-state-highlight">Item Z</div>
</div>

<强> TimestampAppender：

wcPipe = new Each(wcPipe, new Insert(new Fields("timestamp"), ""), Fields.ALL);
wcPipe = new Each(wcPipe, Fields.ALL, new TimestampAppender(Fields.ALL), Fields.RESULTS);

创建新字段

1 个答案: