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Sourcecode: postgresql-8.4 version File versions

btree_interval.c

/*
 * $PostgreSQL: pgsql/contrib/btree_gist/btree_interval.c,v 1.12 2009/06/11 14:48:50 momjian Exp $
 */
#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/timestamp.h"

typedef struct
{
      Interval    lower,
                        upper;
} intvKEY;


/*
** Interval ops
*/
PG_FUNCTION_INFO_V1(gbt_intv_compress);
PG_FUNCTION_INFO_V1(gbt_intv_decompress);
PG_FUNCTION_INFO_V1(gbt_intv_union);
PG_FUNCTION_INFO_V1(gbt_intv_picksplit);
PG_FUNCTION_INFO_V1(gbt_intv_consistent);
PG_FUNCTION_INFO_V1(gbt_intv_penalty);
PG_FUNCTION_INFO_V1(gbt_intv_same);

Datum       gbt_intv_compress(PG_FUNCTION_ARGS);
Datum       gbt_intv_decompress(PG_FUNCTION_ARGS);
Datum       gbt_intv_union(PG_FUNCTION_ARGS);
Datum       gbt_intv_picksplit(PG_FUNCTION_ARGS);
Datum       gbt_intv_consistent(PG_FUNCTION_ARGS);
Datum       gbt_intv_penalty(PG_FUNCTION_ARGS);
Datum       gbt_intv_same(PG_FUNCTION_ARGS);


static bool
gbt_intvgt(const void *a, const void *b)
{
      return DatumGetBool(DirectFunctionCall2(interval_gt, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static bool
gbt_intvge(const void *a, const void *b)
{
      return DatumGetBool(DirectFunctionCall2(interval_ge, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static bool
gbt_intveq(const void *a, const void *b)
{
      return DatumGetBool(DirectFunctionCall2(interval_eq, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static bool
gbt_intvle(const void *a, const void *b)
{
      return DatumGetBool(DirectFunctionCall2(interval_le, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static bool
gbt_intvlt(const void *a, const void *b)
{
      return DatumGetBool(DirectFunctionCall2(interval_lt, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static int
gbt_intvkey_cmp(const void *a, const void *b)
{
      return DatumGetInt32(
                                     DirectFunctionCall2(interval_cmp,
                                                              IntervalPGetDatum(((Nsrt *) a)->t),
                                                               IntervalPGetDatum(((Nsrt *) b)->t)
                                                                   )
            );
}


static double
intr2num(const Interval *i)
{
      return INTERVAL_TO_SEC(i);
}

/*
 * INTERVALSIZE should be the actual size-on-disk of an Interval, as shown
 * in pg_type.    This might be less than sizeof(Interval) if the compiler
 * insists on adding alignment padding at the end of the struct.
 */
#define INTERVALSIZE 16

static const gbtree_ninfo tinfo =
{
      gbt_t_intv,
      sizeof(Interval),
      gbt_intvgt,
      gbt_intvge,
      gbt_intveq,
      gbt_intvle,
      gbt_intvlt,
      gbt_intvkey_cmp
};


/**************************************************
 * interval ops
 **************************************************/


Datum
gbt_intv_compress(PG_FUNCTION_ARGS)
{
      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      GISTENTRY  *retval = entry;

      if (entry->leafkey || INTERVALSIZE != sizeof(Interval))
      {
            char     *r = (char *) palloc(2 * INTERVALSIZE);

            retval = palloc(sizeof(GISTENTRY));

            if (entry->leafkey)
            {
                  Interval   *key = DatumGetIntervalP(entry->key);

                  memcpy((void *) r, (void *) key, INTERVALSIZE);
                  memcpy((void *) (r + INTERVALSIZE), (void *) key, INTERVALSIZE);
            }
            else
            {
                  intvKEY    *key = (intvKEY *) DatumGetPointer(entry->key);

                  memcpy(r, &key->lower, INTERVALSIZE);
                  memcpy(r + INTERVALSIZE, &key->upper, INTERVALSIZE);
            }
            gistentryinit(*retval, PointerGetDatum(r),
                                entry->rel, entry->page,
                                entry->offset, FALSE);
      }

      PG_RETURN_POINTER(retval);

}

Datum
gbt_intv_decompress(PG_FUNCTION_ARGS)
{
      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      GISTENTRY  *retval = entry;

      if (INTERVALSIZE != sizeof(Interval))
      {
            intvKEY    *r = palloc(sizeof(intvKEY));
            char     *key = DatumGetPointer(entry->key);

            retval = palloc(sizeof(GISTENTRY));
            memcpy(&r->lower, key, INTERVALSIZE);
            memcpy(&r->upper, key + INTERVALSIZE, INTERVALSIZE);

            gistentryinit(*retval, PointerGetDatum(r),
                                entry->rel, entry->page,
                                entry->offset, FALSE);
      }
      PG_RETURN_POINTER(retval);
}


Datum
gbt_intv_consistent(PG_FUNCTION_ARGS)
{
      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      Interval   *query = PG_GETARG_INTERVAL_P(1);
      StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

      /* Oid            subtype = PG_GETARG_OID(3); */
      bool     *recheck = (bool *) PG_GETARG_POINTER(4);
      intvKEY    *kkk = (intvKEY *) DatumGetPointer(entry->key);
      GBT_NUMKEY_R key;

      /* All cases served by this function are exact */
      *recheck = false;

      key.lower = (GBT_NUMKEY *) &kkk->lower;
      key.upper = (GBT_NUMKEY *) &kkk->upper;

      PG_RETURN_BOOL(
                           gbt_num_consistent(&key, (void *) query, &strategy, GIST_LEAF(entry), &tinfo)
            );
}


Datum
gbt_intv_union(PG_FUNCTION_ARGS)
{
      GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
      void     *out = palloc(sizeof(intvKEY));

      *(int *) PG_GETARG_POINTER(1) = sizeof(intvKEY);
      PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo));
}


Datum
gbt_intv_penalty(PG_FUNCTION_ARGS)
{
      intvKEY    *origentry = (intvKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
      intvKEY    *newentry = (intvKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
      float    *result = (float *) PG_GETARG_POINTER(2);
      double            iorg[2],
                        inew[2];

      iorg[0] = intr2num(&origentry->lower);
      iorg[1] = intr2num(&origentry->upper);
      inew[0] = intr2num(&newentry->lower);
      inew[1] = intr2num(&newentry->upper);

      penalty_num(result, iorg[0], iorg[1], inew[0], inew[1]);

      PG_RETURN_POINTER(result);

}

Datum
gbt_intv_picksplit(PG_FUNCTION_ARGS)
{
      PG_RETURN_POINTER(gbt_num_picksplit(
                                                      (GistEntryVector *) PG_GETARG_POINTER(0),
                                                        (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
                                                            &tinfo
                                                            ));
}

Datum
gbt_intv_same(PG_FUNCTION_ARGS)
{
      intvKEY    *b1 = (intvKEY *) PG_GETARG_POINTER(0);
      intvKEY    *b2 = (intvKEY *) PG_GETARG_POINTER(1);
      bool     *result = (bool *) PG_GETARG_POINTER(2);

      *result = gbt_num_same((void *) b1, (void *) b2, &tinfo);
      PG_RETURN_POINTER(result);
}

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