tupconvert.h

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/*-------------------------------------------------------------------------
 *
 * tupconvert.h
 *    Tuple conversion support.
 *
 *
 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/access/tupconvert.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef TUPCONVERT_H
#define TUPCONVERT_H

#include "access/htup.h"
#include "access/tupdesc.h"


typedef struct TupleConversionMap
{
    TupleDesc   indesc;         /* tupdesc for source rowtype */
    TupleDesc   outdesc;        /* tupdesc for result rowtype */
    AttrNumber *attrMap;        /* indexes of input fields, or 0 for null */
    Datum      *invalues;       /* workspace for deconstructing source */
    bool       *inisnull;
    Datum      *outvalues;      /* workspace for constructing result */
    bool       *outisnull;
} TupleConversionMap;


extern TupleConversionMap *convert_tuples_by_position(TupleDesc indesc,
                           TupleDesc outdesc,
                           const char *msg);

extern TupleConversionMap *convert_tuples_by_name(TupleDesc indesc,
                       TupleDesc outdesc,
                       const char *msg);

extern HeapTuple do_convert_tuple(HeapTuple tuple, TupleConversionMap *map);

extern void free_conversion_map(TupleConversionMap *map);

#endif   /* TUPCONVERT_H */