queryenvironment.h File Reference

#include "access/tupdesc.h"

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Data Structures
struct	EphemeralNamedRelationMetadataData
struct	EphemeralNamedRelationData

Typedefs
typedef enum EphemeralNameRelationType	EphemeralNameRelationType
typedef struct EphemeralNamedRelationMetadataData	EphemeralNamedRelationMetadataData
typedef EphemeralNamedRelationMetadataData *	EphemeralNamedRelationMetadata
typedef struct EphemeralNamedRelationData	EphemeralNamedRelationData
typedef EphemeralNamedRelationData *	EphemeralNamedRelation
typedef struct QueryEnvironment	QueryEnvironment

Enumerations
enum	EphemeralNameRelationType { ENR_NAMED_TUPLESTORE }

Functions
QueryEnvironment *	create_queryEnv (void)
EphemeralNamedRelationMetadata	get_visible_ENR_metadata (QueryEnvironment *queryEnv, const char *refname)
void	register_ENR (QueryEnvironment *queryEnv, EphemeralNamedRelation enr)
void	unregister_ENR (QueryEnvironment *queryEnv, const char *name)
EphemeralNamedRelation	get_ENR (QueryEnvironment *queryEnv, const char *name)
TupleDesc	ENRMetadataGetTupDesc (EphemeralNamedRelationMetadata enrmd)

Typedef Documentation

EphemeralNamedRelation

typedef EphemeralNamedRelationData* EphemeralNamedRelation

Definition at line 56 of file queryenvironment.h.

EphemeralNamedRelationData

typedef struct EphemeralNamedRelationData EphemeralNamedRelationData

EphemeralNamedRelationMetadata

typedef EphemeralNamedRelationMetadataData* EphemeralNamedRelationMetadata

Definition at line 44 of file queryenvironment.h.

EphemeralNamedRelationMetadataData

typedef struct EphemeralNamedRelationMetadataData EphemeralNamedRelationMetadataData

EphemeralNameRelationType

typedef enum EphemeralNameRelationType EphemeralNameRelationType

QueryEnvironment

typedef struct QueryEnvironment QueryEnvironment

Definition at line 64 of file queryenvironment.h.

Enumeration Type Documentation

EphemeralNameRelationType

enum EphemeralNameRelationType

Enumerator
ENR_NAMED_TUPLESTORE

Definition at line 20 of file queryenvironment.h.

{
    ENR_NAMED_TUPLESTORE,       /* named tuplestore relation; e.g., deltas */
} EphemeralNameRelationType;

Function Documentation

create_queryEnv()

QueryEnvironment * create_queryEnv ( void  )

extern

Definition at line 39 of file queryenvironment.c.

{
    return palloc0_object(QueryEnvironment);
}

References palloc0_object.

Referenced by SPI_register_relation().

ENRMetadataGetTupDesc()

TupleDesc ENRMetadataGetTupDesc ( EphemeralNamedRelationMetadata  enrmd )

extern

Definition at line 125 of file queryenvironment.c.

{
    TupleDesc   tupdesc;
 
    /* One, and only one, of these fields must be filled. */
    Assert((enrmd->reliddesc == InvalidOid) != (enrmd->tupdesc == NULL));
 
    if (enrmd->tupdesc != NULL)
        tupdesc = enrmd->tupdesc;
    else
    {
        Relation    relation;
 
        relation = table_open(enrmd->reliddesc, NoLock);
        tupdesc = relation->rd_att;
        table_close(relation, NoLock);
    }
 
    return tupdesc;
}

References Assert, fb(), InvalidOid, NoLock, RelationData::rd_att, table_close(), and table_open().

Referenced by addRangeTableEntryForENR(), and ExecInitNamedTuplestoreScan().

get_ENR()

EphemeralNamedRelation get_ENR ( QueryEnvironment *  queryEnv, const char *  name  )

extern

Definition at line 96 of file queryenvironment.c.

{
    ListCell   *lc;
 
    Assert(name != NULL);
 
    if (queryEnv == NULL)
        return NULL;
 
    foreach(lc, queryEnv->namedRelList)
    {
        EphemeralNamedRelation enr = (EphemeralNamedRelation) lfirst(lc);
 
        if (strcmp(enr->md.name, name) == 0)
            return enr;
    }
 
    return NULL;
}

References Assert, fb(), lfirst, name, and QueryEnvironment::namedRelList.

Referenced by _SPI_find_ENR_by_name(), ExecInitNamedTuplestoreScan(), get_visible_ENR_metadata(), register_ENR(), and unregister_ENR().

get_visible_ENR_metadata()

EphemeralNamedRelationMetadata get_visible_ENR_metadata ( QueryEnvironment *  queryEnv, const char *  refname  )

extern

Definition at line 45 of file queryenvironment.c.

{
    EphemeralNamedRelation enr;
 
    Assert(refname != NULL);
 
    if (queryEnv == NULL)
        return NULL;
 
    enr = get_ENR(queryEnv, refname);
 
    if (enr)
        return &(enr->md);
 
    return NULL;
}

References Assert, fb(), and get_ENR().

Referenced by get_visible_ENR(), and name_matches_visible_ENR().

register_ENR()

void register_ENR ( QueryEnvironment *  queryEnv, EphemeralNamedRelation  enr  )

extern

Definition at line 69 of file queryenvironment.c.

{
    Assert(enr != NULL);
    Assert(get_ENR(queryEnv, enr->md.name) == NULL);
 
    queryEnv->namedRelList = lappend(queryEnv->namedRelList, enr);
}

References Assert, fb(), get_ENR(), lappend(), and QueryEnvironment::namedRelList.

Referenced by SPI_register_relation().

unregister_ENR()

void unregister_ENR ( QueryEnvironment *  queryEnv, const char *  name  )

extern

Definition at line 82 of file queryenvironment.c.

{
    EphemeralNamedRelation match;
 
    match = get_ENR(queryEnv, name);
    if (match)
        queryEnv->namedRelList = list_delete(queryEnv->namedRelList, match);
}

References get_ENR(), list_delete(), name, and QueryEnvironment::namedRelList.

Referenced by SPI_unregister_relation().