title: Logstash MySQL combine multiple rows?
body: <p>Using logstash</p>
  <p>Data</p>
  <pre><code>| field01           | field02   |
  |q01, q02, q03      |2, 3, 4    |
  |q01, q03           |2, 4       |
  |q01, q03, q04, q05 |2, 4, 5, 6 |
  ....
  </code></pre>
  <p>I want to merge two arrays using logstash filter</p>
  <pre><code>filter {
      mutate {
          split =&gt; { &quot;field01&quot; =&gt; &quot;,&quot; }
          split =&gt; { &quot;field02&quot; =&gt; &quot;,&quot; }
          add_field =&gt; {????} // how should I write it?
      }
  }
  </code></pre>
  <p>result</p>
  <pre><code>data : [
  { 
      field01 : q01,
      field02 : 2
  }, 
  { 
      field01 : q02,
      field02 : 3
  }, 
  ...
  </code></pre>
  <p>how should I write it to get the desired result?</p>
  <p>thanks in advance for your help.</p>