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PLEASE NOTE: This documentation applies to Pentaho 8.1 and an earlier version. For Pentaho 8.2 and later, see Memory Group By on the most recent documentation, visit the Pentaho Enterprise Edition documentation site. |
Description
This step builds aggregates in a group by fashion and does not require a sorted input since it processes all rows within memory. When the number of rows is too large to fit into memory, you need to use the combination of the Sort rows and Group by steps.
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