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btree_date.c

/*
 * $PostgreSQL: pgsql/contrib/btree_gist/btree_date.c,v 1.7 2009/06/11 14:48:50 momjian Exp $
 */
#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/date.h"

typedef struct
{
      DateADT           lower;
      DateADT           upper;
} dateKEY;

/*
** date ops
*/
PG_FUNCTION_INFO_V1(gbt_date_compress);
PG_FUNCTION_INFO_V1(gbt_date_union);
PG_FUNCTION_INFO_V1(gbt_date_picksplit);
PG_FUNCTION_INFO_V1(gbt_date_consistent);
PG_FUNCTION_INFO_V1(gbt_date_penalty);
PG_FUNCTION_INFO_V1(gbt_date_same);

Datum       gbt_date_compress(PG_FUNCTION_ARGS);
Datum       gbt_date_union(PG_FUNCTION_ARGS);
Datum       gbt_date_picksplit(PG_FUNCTION_ARGS);
Datum       gbt_date_consistent(PG_FUNCTION_ARGS);
Datum       gbt_date_penalty(PG_FUNCTION_ARGS);
Datum       gbt_date_same(PG_FUNCTION_ARGS);

static bool
gbt_dategt(const void *a, const void *b)
{
      return DatumGetBool(
                                    DirectFunctionCall2(date_gt, DateADTGetDatum(*((DateADT *) a)), DateADTGetDatum(*((DateADT *) b)))
            );
}

static bool
gbt_datege(const void *a, const void *b)
{
      return DatumGetBool(
                                    DirectFunctionCall2(date_ge, DateADTGetDatum(*((DateADT *) a)), DateADTGetDatum(*((DateADT *) b)))
            );
}

static bool
gbt_dateeq(const void *a, const void *b)
{
      return DatumGetBool(
                                    DirectFunctionCall2(date_eq, DateADTGetDatum(*((DateADT *) a)), DateADTGetDatum(*((DateADT *) b)))
            );
}

static bool
gbt_datele(const void *a, const void *b)
{
      return DatumGetBool(
                                    DirectFunctionCall2(date_le, DateADTGetDatum(*((DateADT *) a)), DateADTGetDatum(*((DateADT *) b)))
            );
}

static bool
gbt_datelt(const void *a, const void *b)
{
      return DatumGetBool(
                                    DirectFunctionCall2(date_lt, DateADTGetDatum(*((DateADT *) a)), DateADTGetDatum(*((DateADT *) b)))
            );
}



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


static const gbtree_ninfo tinfo =
{
      gbt_t_date,
      sizeof(DateADT),
      gbt_dategt,
      gbt_datege,
      gbt_dateeq,
      gbt_datele,
      gbt_datelt,
      gbt_datekey_cmp
};


/**************************************************
 * date ops
 **************************************************/



Datum
gbt_date_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_date_consistent(PG_FUNCTION_ARGS)
{
      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      DateADT           query = PG_GETARG_DATEADT(1);
      StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

      /* Oid            subtype = PG_GETARG_OID(3); */
      bool     *recheck = (bool *) PG_GETARG_POINTER(4);
      dateKEY    *kkk = (dateKEY *) 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_date_union(PG_FUNCTION_ARGS)
{
      GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
      void     *out = palloc(sizeof(dateKEY));

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


Datum
gbt_date_penalty(PG_FUNCTION_ARGS)
{
      dateKEY    *origentry = (dateKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
      dateKEY    *newentry = (dateKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
      float    *result = (float *) PG_GETARG_POINTER(2);
      int32       diff,
                        res;

      diff = DatumGetInt32(DirectFunctionCall2(
                                                                   date_mi,
                                                                   DateADTGetDatum(newentry->upper),
                                                             DateADTGetDatum(origentry->upper)));

      res = Max(diff, 0);

      diff = DatumGetInt32(DirectFunctionCall2(
                                                                   date_mi,
                                                               DateADTGetDatum(origentry->lower),
                                                              DateADTGetDatum(newentry->lower)));

      res += Max(diff, 0);

      *result = 0.0;

      if (res > 0)
      {
            diff = DatumGetInt32(DirectFunctionCall2(
                                                                         date_mi,
                                                               DateADTGetDatum(origentry->upper),
                                                             DateADTGetDatum(origentry->lower)));
            *result += FLT_MIN;
            *result += (float) (res / ((double) (res + diff)));
            *result *= (FLT_MAX / (((GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1));
      }

      PG_RETURN_POINTER(result);
}


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

Datum
gbt_date_same(PG_FUNCTION_ARGS)
{
      dateKEY    *b1 = (dateKEY *) PG_GETARG_POINTER(0);
      dateKEY    *b2 = (dateKEY *) 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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