diff options
Diffstat (limited to 'src/include/executor/execPartition.h')
| -rw-r--r-- | src/include/executor/execPartition.h | 48 |
1 files changed, 25 insertions, 23 deletions
diff --git a/src/include/executor/execPartition.h b/src/include/executor/execPartition.h index 0216d2132c9..9f0b817c547 100644 --- a/src/include/executor/execPartition.h +++ b/src/include/executor/execPartition.h @@ -114,21 +114,21 @@ typedef struct PartitionTupleRouting /*----------------------- * PartitionPruningData - Encapsulates all information required to support - * elimination of partitions in node types which support arbitrary Lists of - * subplans. Information stored here allows the planner's partition pruning - * functions to be called and the return value of partition indexes translated - * into the subpath indexes of node types such as Append, thus allowing us to - * bypass certain subnodes when we have proofs that indicate that no tuple - * matching the 'pruning_steps' will be found within. + * elimination of partitions in plan types which support arbitrary Lists of + * subplans. Information stored here allows the partition pruning functions + * to be called and the return value of partition indexes translated into the + * subpath indexes of plan types such as Append, thus allowing us to bypass a + * subplan when we can prove that no tuple matching the 'pruning_steps' will + * be found within. * - * subnode_map An array containing the subnode index which + * subplan_map An array containing the subplan index which * matches this partition index, or -1 if the - * subnode has been pruned already. - * subpart_map An array containing the offset into the - * 'partprunedata' array in PartitionPruning, or + * subplan has been pruned already. + * subpart_map An array containing the index into the + * partprunedata array in PartitionPruneState, or * -1 if there is no such element in that array. * present_parts A Bitmapset of the partition indexes that we - * have subnodes mapped for. + * have subplans mapped for. * context Contains the context details required to call * the partition pruning code. * pruning_steps List of PartitionPruneSteps used to @@ -141,7 +141,7 @@ typedef struct PartitionTupleRouting */ typedef struct PartitionPruningData { - int *subnode_map; + int *subplan_map; int *subpart_map; Bitmapset *present_parts; PartitionPruneContext context; @@ -151,15 +151,15 @@ typedef struct PartitionPruningData } PartitionPruningData; /*----------------------- - * PartitionPruneState - State object required for executor nodes to perform - * partition pruning elimination of their subnodes. This encapsulates a + * PartitionPruneState - State object required for plan nodes to perform + * partition pruning elimination of their subplans. This encapsulates a * flattened hierarchy of PartitionPruningData structs. - * This struct can be attached to node types which support arbitrary Lists of - * subnodes containing partitions to allow subnodes to be eliminated due to - * the clauses being unable to match to any tuple that the subnode could + * This struct can be attached to plan types which support arbitrary Lists of + * subplans containing partitions to allow subplans to be eliminated due to + * the clauses being unable to match to any tuple that the subplan could * possibly produce. * - * partprunedata Array of PartitionPruningData for the node's target + * partprunedata Array of PartitionPruningData for the plan's target * partitioned relation. First element contains the * details for the target partitioned table. * num_partprunedata Number of items in 'partprunedata' array. @@ -167,10 +167,12 @@ typedef struct PartitionPruningData * startup (at any hierarchy level). * do_exec_prune true if pruning should be performed during * executor run (at any hierarchy level). - * prune_context A memory context which can be used to call the query - * planner's partition prune functions. * execparamids Contains paramids of PARAM_EXEC Params found within - * any of the partprunedata structs. + * any of the partprunedata structs. Pruning must be + * done again each time the value of one of these + * parameters changes. + * prune_context A short-lived memory context in which to execute the + * partition pruning functions. *----------------------- */ typedef struct PartitionPruneState @@ -179,8 +181,8 @@ typedef struct PartitionPruneState int num_partprunedata; bool do_initial_prune; bool do_exec_prune; - MemoryContext prune_context; Bitmapset *execparamids; + MemoryContext prune_context; } PartitionPruneState; extern PartitionTupleRouting *ExecSetupPartitionTupleRouting(ModifyTableState *mtstate, @@ -211,6 +213,6 @@ extern PartitionPruneState *ExecSetupPartitionPruneState(PlanState *planstate, List *partitionpruneinfo); extern Bitmapset *ExecFindMatchingSubPlans(PartitionPruneState *prunestate); extern Bitmapset *ExecFindInitialMatchingSubPlans(PartitionPruneState *prunestate, - int nsubnodes); + int nsubplans); #endif /* EXECPARTITION_H */ |