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/*--------------------------------------------------------------------
* execPartition.h
* POSTGRES partitioning executor interface
*
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/include/executor/execPartition.h
*--------------------------------------------------------------------
*/
#ifndef EXECPARTITION_H
#define EXECPARTITION_H
#include "catalog/partition.h"
#include "nodes/execnodes.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
/*-----------------------
* PartitionDispatch - information about one partitioned table in a partition
* hierarchy required to route a tuple to one of its partitions
*
* reldesc Relation descriptor of the table
* key Partition key information of the table
* keystate Execution state required for expressions in the partition key
* partdesc Partition descriptor of the table
* tupslot A standalone TupleTableSlot initialized with this table's tuple
* descriptor
* tupmap TupleConversionMap to convert from the parent's rowtype to
* this table's rowtype (when extracting the partition key of a
* tuple just before routing it through this table)
* indexes Array with partdesc->nparts members (for details on what
* individual members represent, see how they are set in
* get_partition_dispatch_recurse())
*-----------------------
*/
typedef struct PartitionDispatchData
{
Relation reldesc;
PartitionKey key;
List *keystate; /* list of ExprState */
PartitionDesc partdesc;
TupleTableSlot *tupslot;
TupleConversionMap *tupmap;
int *indexes;
} PartitionDispatchData;
typedef struct PartitionDispatchData *PartitionDispatch;
/*-----------------------
* PartitionTupleRouting - Encapsulates all information required to execute
* tuple-routing between partitions.
*
* partition_dispatch_info Array of PartitionDispatch objects with one
* entry for every partitioned table in the
* partition tree.
* num_dispatch number of partitioned tables in the partition
* tree (= length of partition_dispatch_info[])
* partition_oids Array of leaf partitions OIDs with one entry
* for every leaf partition in the partition tree,
* initialized in full by
* ExecSetupPartitionTupleRouting.
* partitions Array of ResultRelInfo* objects with one entry
* for every leaf partition in the partition tree,
* initialized lazily by ExecInitPartitionInfo.
* num_partitions Number of leaf partitions in the partition tree
* (= 'partitions_oid'/'partitions' array length)
* parent_child_tupconv_maps Array of TupleConversionMap objects with one
* entry for every leaf partition (required to
* convert tuple from the root table's rowtype to
* a leaf partition's rowtype after tuple routing
* is done)
* child_parent_tupconv_maps Array of TupleConversionMap objects with one
* entry for every leaf partition (required to
* convert an updated tuple from the leaf
* partition's rowtype to the root table's rowtype
* so that tuple routing can be done)
* child_parent_map_not_required Array of bool. True value means that a map is
* determined to be not required for the given
* partition. False means either we haven't yet
* checked if a map is required, or it was
* determined to be required.
* subplan_partition_offsets Integer array ordered by UPDATE subplans. Each
* element of this array has the index into the
* corresponding partition in partitions array.
* num_subplan_partition_offsets Length of 'subplan_partition_offsets' array
* partition_tuple_slot TupleTableSlot to be used to manipulate any
* given leaf partition's rowtype after that
* partition is chosen for insertion by
* tuple-routing.
*-----------------------
*/
typedef struct PartitionTupleRouting
{
PartitionDispatch *partition_dispatch_info;
int num_dispatch;
Oid *partition_oids;
ResultRelInfo **partitions;
int num_partitions;
TupleConversionMap **parent_child_tupconv_maps;
TupleConversionMap **child_parent_tupconv_maps;
bool *child_parent_map_not_required;
int *subplan_partition_offsets;
int num_subplan_partition_offsets;
TupleTableSlot *partition_tuple_slot;
TupleTableSlot *root_tuple_slot;
} PartitionTupleRouting;
extern PartitionTupleRouting *ExecSetupPartitionTupleRouting(ModifyTableState *mtstate,
Relation rel);
extern int ExecFindPartition(ResultRelInfo *resultRelInfo,
PartitionDispatch *pd,
TupleTableSlot *slot,
EState *estate);
extern ResultRelInfo *ExecInitPartitionInfo(ModifyTableState *mtstate,
ResultRelInfo *resultRelInfo,
PartitionTupleRouting *proute,
EState *estate, int partidx);
extern void ExecSetupChildParentMapForLeaf(PartitionTupleRouting *proute);
extern TupleConversionMap *TupConvMapForLeaf(PartitionTupleRouting *proute,
ResultRelInfo *rootRelInfo, int leaf_index);
extern HeapTuple ConvertPartitionTupleSlot(TupleConversionMap *map,
HeapTuple tuple,
TupleTableSlot *new_slot,
TupleTableSlot **p_my_slot);
extern void ExecCleanupTupleRouting(PartitionTupleRouting *proute);
#endif /* EXECPARTITION_H */
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