Aggregation Using For-Each-Group in Mapper

Summary

Aggregation Using For-Each-Group in Mapper

Content

I have the following data input:

<production>
  <entry>
    <part>AAA</part>
    <line>Line 1</line>
    <quantity>1000</quantity>
    <transactionDate>2020-04-01T00:00:00Z</transactionDate>
  </entry>
  <entry>
    <part>BBB</part>
    <line>Line 2</line>
    <quantity>100</quantity>
    <transactionDate>2020-04-01T00:00:00Z</transactionDate>
  </entry>
  <entry>
    <part>CCC</part>
    <line>Line 1</line>
    <quantity>10</quantity>
    <transactionDate>2020-04-01T00:00:00Z</transactionDate>
  </entry>
  <entry>
    <part>AAA</part>
    <line>Line 1</line>
    <quantity>1000</quantity>
    <transactionDate>2020-03-01T00:00:00Z</transactionDate>
  </entry>
  <entry>
    <part>BBB</part>
    <line>Line 1</line>
    <quantity>100</quantity>