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/*-------------------------------------------------------------------------
*
* queryenvironment.h
* Access to functions to mutate the query environment and retrieve the
* actual data related to entries (if any).
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/queryenvironment.h
*
*-------------------------------------------------------------------------
*/
#ifndef QUERYENVIRONMENT_H
#define QUERYENVIRONMENT_H
#include "access/tupdesc.h"
typedef enum EphemeralNameRelationType
{
ENR_NAMED_TUPLESTORE /* named tuplestore relation; e.g., deltas */
} EphemeralNameRelationType;
/*
* Some ephemeral named relations must match some relation (e.g., trigger
* transition tables), so to properly handle cached plans and DDL, we should
* carry the OID of that relation. In other cases an ENR might be independent
* of any relation which is stored in the system catalogs, so we need to be
* able to directly store the TupleDesc. We never need both.
*/
typedef struct EphemeralNamedRelationMetadataData
{
char *name; /* name used to identify the relation */
/* only one of the next two fields should be used */
Oid reliddesc; /* oid of relation to get tupdesc */
TupleDesc tupdesc; /* description of result rows */
EphemeralNameRelationType enrtype; /* to identify type of relation */
double enrtuples; /* estimated number of tuples */
} EphemeralNamedRelationMetadataData;
typedef EphemeralNamedRelationMetadataData *EphemeralNamedRelationMetadata;
/*
* Ephemeral Named Relation data; used for parsing named relations not in the
* catalog, like transition tables in AFTER triggers.
*/
typedef struct EphemeralNamedRelationData
{
EphemeralNamedRelationMetadataData md;
void *reldata; /* structure for execution-time access to data */
} EphemeralNamedRelationData;
typedef EphemeralNamedRelationData *EphemeralNamedRelation;
/*
* This is an opaque structure outside of queryenvironment.c itself. The
* intention is to be able to change the implementation or add new context
* features without needing to change existing code for use of existing
* features.
*/
typedef struct QueryEnvironment QueryEnvironment;
extern QueryEnvironment *create_queryEnv(void);
extern EphemeralNamedRelationMetadata get_visible_ENR_metadata(QueryEnvironment *queryEnv, const char *refname);
extern void register_ENR(QueryEnvironment *queryEnv, EphemeralNamedRelation enr);
extern void unregister_ENR(QueryEnvironment *queryEnv, const char *name);
extern EphemeralNamedRelation get_ENR(QueryEnvironment *queryEnv, const char *name);
extern TupleDesc ENRMetadataGetTupDesc(EphemeralNamedRelationMetadata enrmd);
#endif /* QUERYENVIRONMENT_H */
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