tablesample.c File Reference

#include "postgres.h"
#include "access/tsmapi.h"

Include dependency graph for tablesample.c:

Go to the source code of this file.

Functions
TsmRoutine *	GetTsmRoutine (Oid tsmhandler)

Function Documentation

GetTsmRoutine()

TsmRoutine * GetTsmRoutine

(

Oid

tsmhandler

)

Definition at line 27 of file tablesample.c.

{
    Datum       datum;
    TsmRoutine *routine;
 
    datum = OidFunctionCall1(tsmhandler, PointerGetDatum(NULL));
    routine = (TsmRoutine *) DatumGetPointer(datum);
 
    if (routine == NULL || !IsA(routine, TsmRoutine))
        elog(ERROR, "tablesample handler function %u did not return a TsmRoutine struct",
             tsmhandler);
 
    return routine;
}

References DatumGetPointer(), elog, ERROR, IsA, OidFunctionCall1, and PointerGetDatum().

Referenced by cost_samplescan(), ExecInitSampleScan(), set_tablesample_rel_pathlist(), set_tablesample_rel_size(), and transformRangeTableSample().