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btree_ts.c

/*
 * $PostgreSQL: pgsql/contrib/btree_gist/btree_ts.c,v 1.17 2009/06/11 14:48:50 momjian Exp $
 */
#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/datetime.h"

typedef struct
{
      Timestamp   lower;
      Timestamp   upper;
} tsKEY;

/*
** timestamp ops
*/
PG_FUNCTION_INFO_V1(gbt_ts_compress);
PG_FUNCTION_INFO_V1(gbt_tstz_compress);
PG_FUNCTION_INFO_V1(gbt_ts_union);
PG_FUNCTION_INFO_V1(gbt_ts_picksplit);
PG_FUNCTION_INFO_V1(gbt_ts_consistent);
PG_FUNCTION_INFO_V1(gbt_tstz_consistent);
PG_FUNCTION_INFO_V1(gbt_ts_penalty);
PG_FUNCTION_INFO_V1(gbt_ts_same);

Datum       gbt_ts_compress(PG_FUNCTION_ARGS);
Datum       gbt_tstz_compress(PG_FUNCTION_ARGS);
Datum       gbt_ts_union(PG_FUNCTION_ARGS);
Datum       gbt_ts_picksplit(PG_FUNCTION_ARGS);
Datum       gbt_ts_consistent(PG_FUNCTION_ARGS);
Datum       gbt_tstz_consistent(PG_FUNCTION_ARGS);
Datum       gbt_ts_penalty(PG_FUNCTION_ARGS);
Datum       gbt_ts_same(PG_FUNCTION_ARGS);


#ifdef USE_FLOAT8_BYVAL
#define TimestampGetDatumFast(X) TimestampGetDatum(X)
#else
#define TimestampGetDatumFast(X) PointerGetDatum(&(X))
#endif


static bool
gbt_tsgt(const void *a, const void *b)
{
      const Timestamp *aa = (const Timestamp *) a;
      const Timestamp *bb = (const Timestamp *) b;

      return DatumGetBool(DirectFunctionCall2(timestamp_gt,
                                                                  TimestampGetDatumFast(*aa),
                                                                  TimestampGetDatumFast(*bb)));
}

static bool
gbt_tsge(const void *a, const void *b)
{
      const Timestamp *aa = (const Timestamp *) a;
      const Timestamp *bb = (const Timestamp *) b;

      return DatumGetBool(DirectFunctionCall2(timestamp_ge,
                                                                  TimestampGetDatumFast(*aa),
                                                                  TimestampGetDatumFast(*bb)));
}

static bool
gbt_tseq(const void *a, const void *b)
{
      const Timestamp *aa = (const Timestamp *) a;
      const Timestamp *bb = (const Timestamp *) b;

      return DatumGetBool(DirectFunctionCall2(timestamp_eq,
                                                                  TimestampGetDatumFast(*aa),
                                                                  TimestampGetDatumFast(*bb)));
}

static bool
gbt_tsle(const void *a, const void *b)
{
      const Timestamp *aa = (const Timestamp *) a;
      const Timestamp *bb = (const Timestamp *) b;

      return DatumGetBool(DirectFunctionCall2(timestamp_le,
                                                                  TimestampGetDatumFast(*aa),
                                                                  TimestampGetDatumFast(*bb)));
}

static bool
gbt_tslt(const void *a, const void *b)
{
      const Timestamp *aa = (const Timestamp *) a;
      const Timestamp *bb = (const Timestamp *) b;

      return DatumGetBool(DirectFunctionCall2(timestamp_lt,
                                                                  TimestampGetDatumFast(*aa),
                                                                  TimestampGetDatumFast(*bb)));
}


static int
gbt_tskey_cmp(const void *a, const void *b)
{
      if (gbt_tsgt((void *) &(((Nsrt *) a)->t[0]), (void *) &(((Nsrt *) b)->t[0])))
            return 1;
      else if (gbt_tslt((void *) &(((Nsrt *) a)->t[0]), (void *) &(((Nsrt *) b)->t[0])))
            return -1;
      return 0;
}


static const gbtree_ninfo tinfo =
{
      gbt_t_ts,
      sizeof(Timestamp),
      gbt_tsgt,
      gbt_tsge,
      gbt_tseq,
      gbt_tsle,
      gbt_tslt,
      gbt_tskey_cmp
};


/**************************************************
 * timestamp ops
 **************************************************/


static Timestamp
tstz_to_ts_gmt(TimestampTz ts)
{
      Timestamp   gmt;
      int               val,
                        tz;

      gmt = ts;
      DecodeSpecial(0, "gmt", &val);

      if (ts < DT_NOEND && ts > DT_NOBEGIN)
      {
            tz = val * 60;

#ifdef HAVE_INT64_TIMESTAMP
            gmt -= (tz * INT64CONST(1000000));
#else
            gmt -= tz;
#endif
      }
      return gmt;
}


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

      PG_RETURN_POINTER(gbt_num_compress(retval, entry, &tinfo));
}


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

      if (entry->leafkey)
      {
            tsKEY    *r = (tsKEY *) palloc(sizeof(tsKEY));
            TimestampTz ts = DatumGetTimestampTz(entry->key);
            Timestamp   gmt;

            gmt = tstz_to_ts_gmt(ts);

            retval = palloc(sizeof(GISTENTRY));
            r->lower = r->upper = gmt;
            gistentryinit(*retval, PointerGetDatum(r),
                                entry->rel, entry->page,
                                entry->offset, FALSE);
      }
      else
            retval = entry;

      PG_RETURN_POINTER(retval);
}


Datum
gbt_ts_consistent(PG_FUNCTION_ARGS)
{
      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      Timestamp   query = PG_GETARG_TIMESTAMP(1);
      StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

      /* Oid            subtype = PG_GETARG_OID(3); */
      bool     *recheck = (bool *) PG_GETARG_POINTER(4);
      tsKEY    *kkk = (tsKEY *) 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_tstz_consistent(PG_FUNCTION_ARGS)
{
      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      TimestampTz query = PG_GETARG_TIMESTAMPTZ(1);
      StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

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

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

      key.lower = (GBT_NUMKEY *) &kkk[0];
      key.upper = (GBT_NUMKEY *) &kkk[MAXALIGN(tinfo.size)];
      qqq = tstz_to_ts_gmt(query);

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


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

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


#define penalty_check_max_float(val) do { \
            if ( val > FLT_MAX ) \
                        val = FLT_MAX; \
            if ( val < -FLT_MAX ) \
                        val = -FLT_MAX; \
} while(false);


Datum
gbt_ts_penalty(PG_FUNCTION_ARGS)
{

      tsKEY    *origentry = (tsKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
      tsKEY    *newentry = (tsKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
      float    *result = (float *) PG_GETARG_POINTER(2);

      double            orgdbl[2],
                        newdbl[2];

      /*
       * We are allways using "double" timestamps here. Precision should be good
       * enough.
       */
      orgdbl[0] = ((double) origentry->lower);
      orgdbl[1] = ((double) origentry->upper);
      newdbl[0] = ((double) newentry->lower);
      newdbl[1] = ((double) newentry->upper);

      penalty_check_max_float(orgdbl[0]);
      penalty_check_max_float(orgdbl[1]);
      penalty_check_max_float(newdbl[0]);
      penalty_check_max_float(newdbl[1]);

      penalty_num(result, orgdbl[0], orgdbl[1], newdbl[0], newdbl[1]);

      PG_RETURN_POINTER(result);

}


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

Datum
gbt_ts_same(PG_FUNCTION_ARGS)
{
      tsKEY    *b1 = (tsKEY *) PG_GETARG_POINTER(0);
      tsKEY    *b2 = (tsKEY *) 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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