Joshua D. Drake wrote:
If we don't have multi-table indexes how do we enforce a primary key against a partitioned set?

The executor would have to be clever enough to not do a single index scan, but possibly scan through multiple indexes when asking for uniqueness, depending on the partitioning rule set.



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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not

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