Logo Search packages:      
Sourcecode: postgresql-8.4 version File versions

btree_bit.c

/*
 * $PostgreSQL: pgsql/contrib/btree_gist/btree_bit.c,v 1.9 2008/05/17 01:28:19 adunstan Exp $ 
 */
#include "btree_gist.h"
#include "btree_utils_var.h"
#include "utils/builtins.h"
#include "utils/varbit.h"


/*
** Bit ops
*/
PG_FUNCTION_INFO_V1(gbt_bit_compress);
PG_FUNCTION_INFO_V1(gbt_bit_union);
PG_FUNCTION_INFO_V1(gbt_bit_picksplit);
PG_FUNCTION_INFO_V1(gbt_bit_consistent);
PG_FUNCTION_INFO_V1(gbt_bit_penalty);
PG_FUNCTION_INFO_V1(gbt_bit_same);

Datum       gbt_bit_compress(PG_FUNCTION_ARGS);
Datum       gbt_bit_union(PG_FUNCTION_ARGS);
Datum       gbt_bit_picksplit(PG_FUNCTION_ARGS);
Datum       gbt_bit_consistent(PG_FUNCTION_ARGS);
Datum       gbt_bit_penalty(PG_FUNCTION_ARGS);
Datum       gbt_bit_same(PG_FUNCTION_ARGS);



/* define for comparison */

static bool
gbt_bitgt(const void *a, const void *b)
{
      return (DatumGetBool(DirectFunctionCall2(bitgt, PointerGetDatum(a), PointerGetDatum(b))));
}

static bool
gbt_bitge(const void *a, const void *b)
{
      return (DatumGetBool(DirectFunctionCall2(bitge, PointerGetDatum(a), PointerGetDatum(b))));
}

static bool
gbt_biteq(const void *a, const void *b)
{
      return (DatumGetBool(DirectFunctionCall2(biteq, PointerGetDatum(a), PointerGetDatum(b))));
}

static bool
gbt_bitle(const void *a, const void *b)
{
      return (DatumGetBool(DirectFunctionCall2(bitle, PointerGetDatum(a), PointerGetDatum(b))));
}

static bool
gbt_bitlt(const void *a, const void *b)
{
      return (DatumGetBool(DirectFunctionCall2(bitlt, PointerGetDatum(a), PointerGetDatum(b))));
}

static int32
gbt_bitcmp(const bytea *a, const bytea *b)
{
      return
            (DatumGetInt32(DirectFunctionCall2(byteacmp, PointerGetDatum(a), PointerGetDatum(b))));
}


static bytea *
gbt_bit_xfrm(bytea *leaf)
{
      bytea    *out = leaf;
      int               s = INTALIGN(VARBITBYTES(leaf) + VARHDRSZ);

      out = palloc(s);
      SET_VARSIZE(out, s);
      memcpy((void *) VARDATA(out), (void *) VARBITS(leaf), VARBITBYTES(leaf));
      return out;
}




static GBT_VARKEY *
gbt_bit_l2n(GBT_VARKEY * leaf)
{

      GBT_VARKEY *out = leaf;
      GBT_VARKEY_R r = gbt_var_key_readable(leaf);
      bytea    *o;

      o = gbt_bit_xfrm(r.lower);
      r.upper = r.lower = o;
      out = gbt_var_key_copy(&r, TRUE);
      pfree(o);

      return out;

}

static const gbtree_vinfo tinfo =
{
      gbt_t_bit,
      0,
      TRUE,
      gbt_bitgt,
      gbt_bitge,
      gbt_biteq,
      gbt_bitle,
      gbt_bitlt,
      gbt_bitcmp,
      gbt_bit_l2n
};


/**************************************************
 * Bit ops
 **************************************************/

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

      PG_RETURN_POINTER(gbt_var_compress(entry, &tinfo));
}

Datum
gbt_bit_consistent(PG_FUNCTION_ARGS)
{
      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      void     *query = (void *) DatumGetByteaP(PG_GETARG_DATUM(1));
      StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
      /* Oid            subtype = PG_GETARG_OID(3); */
      bool     *recheck = (bool *) PG_GETARG_POINTER(4);
      bool        retval = FALSE;
      GBT_VARKEY *key = (GBT_VARKEY *) DatumGetPointer(entry->key);
      GBT_VARKEY_R r = gbt_var_key_readable(key);

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

      if (GIST_LEAF(entry))
            retval = gbt_var_consistent(&r, query, &strategy, TRUE, &tinfo);
      else
      {
            bytea    *q = gbt_bit_xfrm((bytea *) query);

            retval = gbt_var_consistent(&r, (void *) q, &strategy, FALSE, &tinfo);
      }
      PG_RETURN_BOOL(retval);
}



Datum
gbt_bit_union(PG_FUNCTION_ARGS)
{
      GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
      int32    *size = (int *) PG_GETARG_POINTER(1);

      PG_RETURN_POINTER(gbt_var_union(entryvec, size, &tinfo));
}


Datum
gbt_bit_picksplit(PG_FUNCTION_ARGS)
{
      GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
      GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);

      gbt_var_picksplit(entryvec, v, &tinfo);
      PG_RETURN_POINTER(v);
}

Datum
gbt_bit_same(PG_FUNCTION_ARGS)
{
      Datum       d1 = PG_GETARG_DATUM(0);
      Datum       d2 = PG_GETARG_DATUM(1);
      bool     *result = (bool *) PG_GETARG_POINTER(2);

      PG_RETURN_POINTER(gbt_var_same(result, d1, d2, &tinfo));
}


Datum
gbt_bit_penalty(PG_FUNCTION_ARGS)
{
      GISTENTRY  *o = (GISTENTRY *) PG_GETARG_POINTER(0);
      GISTENTRY  *n = (GISTENTRY *) PG_GETARG_POINTER(1);
      float    *result = (float *) PG_GETARG_POINTER(2);

      PG_RETURN_POINTER(gbt_var_penalty(result, o, n, &tinfo));
}

Generated by  Doxygen 1.6.0   Back to index