gin_tuple.h File Reference

#include "access/ginblock.h"
#include "storage/itemptr.h"
#include "utils/sortsupport.h"

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Data Structures
struct	GinTuple

Typedefs
typedef struct GinTuple	GinTuple

Functions
static ItemPointer	GinTupleGetFirst (GinTuple *tup)
int	_gin_compare_tuples (GinTuple *a, GinTuple *b, SortSupport ssup)

Typedef Documentation

GinTuple

typedef struct GinTuple GinTuple

Function Documentation

_gin_compare_tuples()

int _gin_compare_tuples	(	GinTuple *	a,
		GinTuple *	b,
		SortSupport	ssup
	)

Definition at line 2433 of file gininsert.c.

{
    int         r;
    Datum       keya,
                keyb;
 
    if (a->attrnum < b->attrnum)
        return -1;
 
    if (a->attrnum > b->attrnum)
        return 1;
 
    if (a->category < b->category)
        return -1;
 
    if (a->category > b->category)
        return 1;
 
    if (a->category == GIN_CAT_NORM_KEY)
    {
        keya = _gin_parse_tuple_key(a);
        keyb = _gin_parse_tuple_key(b);
 
        r = ApplySortComparator(keya, false,
                                keyb, false,
                                &ssup[a->attrnum - 1]);
 
        /* if the key is the same, consider the first TID in the array */
        return (r != 0) ? r : ItemPointerCompare(GinTupleGetFirst(a),
                                                 GinTupleGetFirst(b));
    }
 
    return ItemPointerCompare(GinTupleGetFirst(a),
                              GinTupleGetFirst(b));
}

References _gin_parse_tuple_key(), a, ApplySortComparator(), b, GIN_CAT_NORM_KEY, GinTupleGetFirst(), and ItemPointerCompare().

Referenced by comparetup_index_gin().

GinTupleGetFirst()

static ItemPointer GinTupleGetFirst ( GinTuple *  tup )

inlinestatic

Definition at line 35 of file gin_tuple.h.

{
    GinPostingList *list;
 
    list = (GinPostingList *) SHORTALIGN(tup->data + tup->keylen);
 
    return &list->first;
}

References GinTuple::data, GinTuple::keylen, sort-test::list, and SHORTALIGN.

Referenced by _gin_compare_tuples(), and GinBufferShouldTrim().