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If you want to merge the cells in a column that have the same value define <SpanSummaryCollection> and set the field name you want to merge in <SpanMergingField> as below. This example demonstrates that the Year and Quarter columns are set to be merged, whose values are same.

...
<dataProvider>
  <SpanSummaryCollection source="{$gridData}" >
    <mergingFields>
      <SpanMergingField name="Year" />
      <SpanMergingField name="Quarter" />
    <mergingFields/>
  <SpanSummaryCollection/>
</dataProvider>
...

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