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You can use heartbeats to clean up the SweepAreas of the Element Join earlier to reduce memory consumption. The heartbeats do not change the query results. The cleanup in a Element Join with element size set to one can be seen in the Figure below:
Grouping / Partitions
You can use groups to have the count of n elements for each group. Here's an example with element size set to one (for bow sides), grouping by the id and with heartbeats:
