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The interaction of these parameters was a bit confused/confusing, and in fact v11 entirely misses the opportunity to apply partition constraints when a partition is accessed directly (rather than indirectly from its parent). In HEAD, establish the principle that enable_partition_pruning controls partition pruning and nothing else. When accessing a partition via its parent, we do partition pruning (if enabled by enable_partition_pruning) and then there is no need to consider partition constraints in the constraint_exclusion logic. When accessing a partition directly, its partition constraints are applied by the constraint_exclusion logic, only if constraint_exclusion = on. In v11, we can't have such a clean division of these GUCs' effects, partly because we don't want to break compatibility too much in a released branch, and partly because the clean coding requires inheritance_planner to have applied partition pruning to a partitioned target table, which it doesn't in v11. However, we can tweak things enough to cover the missed case, which seems like a good idea since it's potentially a performance regression from v10. This patch keeps v11's previous behavior in which enable_partition_pruning overrides constraint_exclusion for an inherited target table, though. In HEAD, also teach relation_excluded_by_constraints that it's okay to use inheritable constraints when trying to prune a traditional inheritance tree. This might not be thought worthy of effort given that that feature is semi-deprecated now, but we have enough infrastructure that it only takes a couple more lines of code to do it correctly. Amit Langote and Tom Lane Discussion: https://postgr.es/m/9813f079-f16b-61c8-9ab7-4363cab28d80@lab.ntt.co.jp Discussion: https://postgr.es/m/29069.1555970894@sss.pgh.pa.us |
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