tupconvert.h

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/*-------------------------------------------------------------------------
 *
 * tupconvert.h
 *    Tuple conversion support.
 *
 *
 * Portions Copyright (c) 1996-2025, 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/attmap.h"
#include "access/htup.h"
#include "access/tupdesc.h"
#include "executor/tuptable.h"
#include "nodes/bitmapset.h"
 
 
typedef struct TupleConversionMap
{
    TupleDesc   indesc;         /* tupdesc for source rowtype */
    TupleDesc   outdesc;        /* tupdesc for result rowtype */
    AttrMap    *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);
extern TupleConversionMap *convert_tuples_by_name_attrmap(TupleDesc indesc,
                                                          TupleDesc outdesc,
                                                          AttrMap *attrMap);
 
extern HeapTuple execute_attr_map_tuple(HeapTuple tuple, TupleConversionMap *map);
extern TupleTableSlot *execute_attr_map_slot(AttrMap *attrMap,
                                             TupleTableSlot *in_slot,
                                             TupleTableSlot *out_slot);
extern Bitmapset *execute_attr_map_cols(AttrMap *attrMap, Bitmapset *in_cols);
 
extern void free_conversion_map(TupleConversionMap *map);
 
#endif                          /* TUPCONVERT_H */