amapi.c File Reference

#include "postgres.h"
#include "access/amapi.h"
#include "access/htup_details.h"
#include "catalog/pg_am.h"
#include "catalog/pg_opclass.h"
#include "utils/fmgrprotos.h"
#include "utils/syscache.h"

Include dependency graph for amapi.c:

Go to the source code of this file.

Functions
IndexAmRoutine *	GetIndexAmRoutine (Oid amhandler)
IndexAmRoutine *	GetIndexAmRoutineByAmId (Oid amoid, bool noerror)
Datum	amvalidate (PG_FUNCTION_ARGS)

Function Documentation

amvalidate()

Datum amvalidate

(

PG_FUNCTION_ARGS

)

Definition at line 114 of file amapi.c.

{
    Oid         opclassoid = PG_GETARG_OID(0);
    bool        result;
    HeapTuple   classtup;
    Form_pg_opclass classform;
    Oid         amoid;
    IndexAmRoutine *amroutine;
 
    classtup = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclassoid));
    if (!HeapTupleIsValid(classtup))
        elog(ERROR, "cache lookup failed for operator class %u", opclassoid);
    classform = (Form_pg_opclass) GETSTRUCT(classtup);
 
    amoid = classform->opcmethod;
 
    ReleaseSysCache(classtup);
 
    amroutine = GetIndexAmRoutineByAmId(amoid, false);
 
    if (amroutine->amvalidate == NULL)
        elog(ERROR, "function amvalidate is not defined for index access method %u",
             amoid);
 
    result = amroutine->amvalidate(opclassoid);
 
    pfree(amroutine);
 
    PG_RETURN_BOOL(result);
}

References IndexAmRoutine::amvalidate, elog, ERROR, GetIndexAmRoutineByAmId(), GETSTRUCT, HeapTupleIsValid, ObjectIdGetDatum(), pfree(), PG_GETARG_OID, PG_RETURN_BOOL, ReleaseSysCache(), and SearchSysCache1().

GetIndexAmRoutine()

IndexAmRoutine* GetIndexAmRoutine

(

Oid

amhandler

)

Definition at line 33 of file amapi.c.

{
    Datum       datum;
    IndexAmRoutine *routine;
 
    datum = OidFunctionCall0(amhandler);
    routine = (IndexAmRoutine *) DatumGetPointer(datum);
 
    if (routine == NULL || !IsA(routine, IndexAmRoutine))
        elog(ERROR, "index access method handler function %u did not return an IndexAmRoutine struct",
             amhandler);
 
    return routine;
}

References DatumGetPointer(), elog, ERROR, IsA, and OidFunctionCall0.

Referenced by CheckIndexCompatible(), DefineIndex(), GetIndexAmRoutineByAmId(), InitIndexAmRoutine(), and pg_get_indexdef_worker().

GetIndexAmRoutineByAmId()

IndexAmRoutine* GetIndexAmRoutineByAmId	(	Oid	amoid,
		bool	noerror
	)

Definition at line 56 of file amapi.c.

{
    HeapTuple   tuple;
    Form_pg_am  amform;
    regproc     amhandler;
 
    /* Get handler function OID for the access method */
    tuple = SearchSysCache1(AMOID, ObjectIdGetDatum(amoid));
    if (!HeapTupleIsValid(tuple))
    {
        if (noerror)
            return NULL;
        elog(ERROR, "cache lookup failed for access method %u",
             amoid);
    }
    amform = (Form_pg_am) GETSTRUCT(tuple);
 
    /* Check if it's an index access method as opposed to some other AM */
    if (amform->amtype != AMTYPE_INDEX)
    {
        if (noerror)
        {
            ReleaseSysCache(tuple);
            return NULL;
        }
        ereport(ERROR,
                (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                 errmsg("access method \"%s\" is not of type %s",
                        NameStr(amform->amname), "INDEX")));
    }
 
    amhandler = amform->amhandler;
 
    /* Complain if handler OID is invalid */
    if (!RegProcedureIsValid(amhandler))
    {
        if (noerror)
        {
            ReleaseSysCache(tuple);
            return NULL;
        }
        ereport(ERROR,
                (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                 errmsg("index access method \"%s\" does not have a handler",
                        NameStr(amform->amname))));
    }
 
    ReleaseSysCache(tuple);
 
    /* And finally, call the handler function to get the API struct. */
    return GetIndexAmRoutine(amhandler);
}

References elog, ereport, errcode(), errmsg(), ERROR, GetIndexAmRoutine(), GETSTRUCT, HeapTupleIsValid, NameStr, ObjectIdGetDatum(), RegProcedureIsValid, ReleaseSysCache(), and SearchSysCache1().

Referenced by AlterOpFamily(), AlterOpFamilyAdd(), amvalidate(), assignOperTypes(), ConstructTupleDescriptor(), DefineOpClass(), indexam_property(), IndexSupportsBackwardScan(), IsIndexUsableForReplicaIdentityFull(), and pg_indexam_progress_phasename().