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A non-leaf partition with a subplan that is an Append node was omitted from PlannedStmt.unprunableRelids because it was mistakenly included in PlannerGlobal.prunableRelids due to the way PartitionedRelPruneInfo.leafpart_rti_map[] is constructed. This happened when a non-leaf partition used an unflattened Append or MergeAppend. As a result, ExecGetRangeTableRelation() reported an error when called from CreatePartitionPruneState() to process the partition's own PartitionPruneInfo, since it was treated as prunable when it should not have been. Reported-by: Alexander Lakhin <exclusion@gmail.com> (via sqlsmith) Diagnosed-by: Tender Wang <tndrwang@gmail.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Discussion: https://postgr.es/m/74839af6-aadc-4f60-ae77-ae65f94bf607@gmail.com