Related Work:

• Rdb/VMS
  • Start multiple different executions of the same logical operators, choose the best operator, terminate the others.

• MIND heterogeneous database project
  • divide query into subqueries and send to each subquery to a site for execution, compose results incrementally
  • resembles Pair.

• Reorder left-deep join trees into busy join trees

• Mermaid, InterViso

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