gin_tuple.h

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/*--------------------------------------------------------------------------
 * gin.h
 *    Public header file for Generalized Inverted Index access method.
 *
 *  Copyright (c) 2006-2024, PostgreSQL Global Development Group
 *
 *  src/include/access/gin.h
 *--------------------------------------------------------------------------
 */
#ifndef GIN_TUPLE_
#define GIN_TUPLE_
 
#include "access/ginblock.h"
#include "storage/itemptr.h"
#include "utils/sortsupport.h"
 
/*
 * Data for one key in a GIN index.
 */
typedef struct GinTuple
{
    int         tuplen;         /* length of the whole tuple */
    OffsetNumber attrnum;       /* attnum of index key */
    uint16      keylen;         /* bytes in data for key value */
    int16       typlen;         /* typlen for key */
    bool        typbyval;       /* typbyval for key */
    signed char category;       /* category: normal or NULL? */
    int         nitems;         /* number of TIDs in the data */
    char        data[FLEXIBLE_ARRAY_MEMBER];
} GinTuple;
 
static inline ItemPointer
GinTupleGetFirst(GinTuple *tup)
{
    GinPostingList *list;
 
    list = (GinPostingList *) SHORTALIGN(tup->data + tup->keylen);
 
    return &list->first;
}
 
extern int  _gin_compare_tuples(GinTuple *a, GinTuple *b, SortSupport ssup);
 
#endif                          /* GIN_TUPLE_H */