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Sourcecode: postgresql-8.4 version File versions

btree_text.c

/*
 * $PostgreSQL: pgsql/contrib/btree_gist/btree_text.c,v 1.11 2008/05/17 01:28:19 adunstan Exp $ 
 */
#include "btree_gist.h"
#include "btree_utils_var.h"
#include "utils/builtins.h"

/*
** Text ops
*/
PG_FUNCTION_INFO_V1(gbt_text_compress);
PG_FUNCTION_INFO_V1(gbt_bpchar_compress);
PG_FUNCTION_INFO_V1(gbt_text_union);
PG_FUNCTION_INFO_V1(gbt_text_picksplit);
PG_FUNCTION_INFO_V1(gbt_text_consistent);
PG_FUNCTION_INFO_V1(gbt_bpchar_consistent);
PG_FUNCTION_INFO_V1(gbt_text_penalty);
PG_FUNCTION_INFO_V1(gbt_text_same);

Datum       gbt_text_compress(PG_FUNCTION_ARGS);
Datum       gbt_bpchar_compress(PG_FUNCTION_ARGS);
Datum       gbt_text_union(PG_FUNCTION_ARGS);
Datum       gbt_text_picksplit(PG_FUNCTION_ARGS);
Datum       gbt_text_consistent(PG_FUNCTION_ARGS);
Datum       gbt_bpchar_consistent(PG_FUNCTION_ARGS);
Datum       gbt_text_penalty(PG_FUNCTION_ARGS);
Datum       gbt_text_same(PG_FUNCTION_ARGS);


/* define for comparison */

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

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

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

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

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

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

static gbtree_vinfo tinfo =
{
      gbt_t_text,
      0,
      FALSE,
      gbt_textgt,
      gbt_textge,
      gbt_texteq,
      gbt_textle,
      gbt_textlt,
      gbt_textcmp,
      NULL
};


/**************************************************
 * Text ops
 **************************************************/


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

      if (tinfo.eml == 0)
      {
            tinfo.eml = pg_database_encoding_max_length();
      }

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

Datum
gbt_bpchar_compress(PG_FUNCTION_ARGS)
{

      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      GISTENTRY  *retval;

      if (tinfo.eml == 0)
      {
            tinfo.eml = pg_database_encoding_max_length();
      }

      if (entry->leafkey)
      {

            Datum       d = DirectFunctionCall1(rtrim1, entry->key);
            GISTENTRY   trim;

            gistentryinit(trim, d,
                                entry->rel, entry->page,
                                entry->offset, TRUE);
            retval = gbt_var_compress(&trim, &tinfo);
      }
      else
            retval = entry;

      PG_RETURN_POINTER(retval);
}



Datum
gbt_text_consistent(PG_FUNCTION_ARGS)
{
      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      void     *query = (void *) DatumGetTextP(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;
      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 (tinfo.eml == 0)
      {
            tinfo.eml = pg_database_encoding_max_length();
      }

      retval = gbt_var_consistent(&r, query, &strategy, GIST_LEAF(entry), &tinfo);

      PG_RETURN_BOOL(retval);
}


Datum
gbt_bpchar_consistent(PG_FUNCTION_ARGS)
{
      GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
      void     *query = (void *) DatumGetPointer(PG_DETOAST_DATUM(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;
      GBT_VARKEY *key = (GBT_VARKEY *) DatumGetPointer(entry->key);
      GBT_VARKEY_R r = gbt_var_key_readable(key);
      void     *trim = (void *) DatumGetPointer(DirectFunctionCall1(rtrim1, PointerGetDatum(query)));

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

      if (tinfo.eml == 0)
      {
            tinfo.eml = pg_database_encoding_max_length();
      }

      retval = gbt_var_consistent(&r, trim, &strategy, GIST_LEAF(entry), &tinfo);
      PG_RETURN_BOOL(retval);
}


Datum
gbt_text_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_text_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_text_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_text_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));
}

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