contrib/btree_gist/btree_int2.c

   1 /*
   2  * contrib/btree_gist/btree_int2.c
   3  */
   4 #include "postgres.h"
   5
   6 #include "btree_gist.h"
   7 #include "btree_utils_num.h"
   8 #include "common/int.h"
   9
  10 typedef struct int16key
  11 {
  12         int16           lower;
  13         int16           upper;
  14 } int16KEY;
  15
  16 /*
  17 ** int16 ops
  18 */
  19 PG_FUNCTION_INFO_V1(gbt_int2_compress);
  20 PG_FUNCTION_INFO_V1(gbt_int2_fetch);
  21 PG_FUNCTION_INFO_V1(gbt_int2_union);
  22 PG_FUNCTION_INFO_V1(gbt_int2_picksplit);
  23 PG_FUNCTION_INFO_V1(gbt_int2_consistent);
  24 PG_FUNCTION_INFO_V1(gbt_int2_distance);
  25 PG_FUNCTION_INFO_V1(gbt_int2_penalty);
  26 PG_FUNCTION_INFO_V1(gbt_int2_same);
  27
  28 static bool
  29 gbt_int2gt(const void *a, const void *b, FmgrInfo *flinfo)
  30 {
  31         return (*((const int16 *) a) > *((const int16 *) b));
  32 }
  33 static bool
  34 gbt_int2ge(const void *a, const void *b, FmgrInfo *flinfo)
  35 {
  36         return (*((const int16 *) a) >= *((const int16 *) b));
  37 }
  38 static bool
  39 gbt_int2eq(const void *a, const void *b, FmgrInfo *flinfo)
  40 {
  41         return (*((const int16 *) a) == *((const int16 *) b));
  42 }
  43 static bool
  44 gbt_int2le(const void *a, const void *b, FmgrInfo *flinfo)
  45 {
  46         return (*((const int16 *) a) <= *((const int16 *) b));
  47 }
  48 static bool
  49 gbt_int2lt(const void *a, const void *b, FmgrInfo *flinfo)
  50 {
  51         return (*((const int16 *) a) < *((const int16 *) b));
  52 }
  53
  54 static int
  55 gbt_int2key_cmp(const void *a, const void *b, FmgrInfo *flinfo)
  56 {
  57         int16KEY   *ia = (int16KEY *) (((const Nsrt *) a)->t);
  58         int16KEY   *ib = (int16KEY *) (((const Nsrt *) b)->t);
  59
  60         if (ia->lower == ib->lower)
  61         {
  62                 if (ia->upper == ib->upper)
  63                         return 0;
  64
  65                 return (ia->upper > ib->upper) ? 1 : -1;
  66         }
  67
  68         return (ia->lower > ib->lower) ? 1 : -1;
  69 }
  70
  71 static float8
  72 gbt_int2_dist(const void *a, const void *b, FmgrInfo *flinfo)
  73 {
  74         return GET_FLOAT_DISTANCE(int16, a, b);
  75 }
  76
  77
  78 static const gbtree_ninfo tinfo =
  79 {
  80         gbt_t_int2,
  81         sizeof(int16),
  82         4,                                                      /* sizeof(gbtreekey4) */
  83         gbt_int2gt,
  84         gbt_int2ge,
  85         gbt_int2eq,
  86         gbt_int2le,
  87         gbt_int2lt,
  88         gbt_int2key_cmp,
  89         gbt_int2_dist
  90 };
  91
  92
  93 PG_FUNCTION_INFO_V1(int2_dist);
  94 Datum
  95 int2_dist(PG_FUNCTION_ARGS)
  96 {
  97         int16           a = PG_GETARG_INT16(0);
  98         int16           b = PG_GETARG_INT16(1);
  99         int16           r;
 100         int16           ra;
 101
 102         if (pg_sub_s16_overflow(a, b, &r) ||
 103                 r == PG_INT16_MIN)
 104                 ereport(ERROR,
 105                                 (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
 106                                  errmsg("smallint out of range")));
 107
 108         ra = Abs(r);
 109
 110         PG_RETURN_INT16(ra);
 111 }
 112
 113
 114 /**************************************************
 115  * int16 ops
 116  **************************************************/
 117
 118
 119 Datum
 120 gbt_int2_compress(PG_FUNCTION_ARGS)
 121 {
 122         GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 123
 124         PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
 125 }
 126
 127 Datum
 128 gbt_int2_fetch(PG_FUNCTION_ARGS)
 129 {
 130         GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 131
 132         PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
 133 }
 134
 135 Datum
 136 gbt_int2_consistent(PG_FUNCTION_ARGS)
 137 {
 138         GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 139         int16           query = PG_GETARG_INT16(1);
 140         StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
 141
 142         /* Oid          subtype = PG_GETARG_OID(3); */
 143         bool       *recheck = (bool *) PG_GETARG_POINTER(4);
 144         int16KEY   *kkk = (int16KEY *) DatumGetPointer(entry->key);
 145         GBT_NUMKEY_R key;
 146
 147         /* All cases served by this function are exact */
 148         *recheck = false;
 149
 150         key.lower = (GBT_NUMKEY *) &kkk->lower;
 151         key.upper = (GBT_NUMKEY *) &kkk->upper;
 152
 153         PG_RETURN_BOOL(gbt_num_consistent(&key, (void *) &query, &strategy,
 154                                                                           GIST_LEAF(entry), &tinfo, fcinfo->flinfo));
 155 }
 156
 157
 158 Datum
 159 gbt_int2_distance(PG_FUNCTION_ARGS)
 160 {
 161         GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 162         int16           query = PG_GETARG_INT16(1);
 163
 164         /* Oid          subtype = PG_GETARG_OID(3); */
 165         int16KEY   *kkk = (int16KEY *) DatumGetPointer(entry->key);
 166         GBT_NUMKEY_R key;
 167
 168         key.lower = (GBT_NUMKEY *) &kkk->lower;
 169         key.upper = (GBT_NUMKEY *) &kkk->upper;
 170
 171         PG_RETURN_FLOAT8(gbt_num_distance(&key, (void *) &query, GIST_LEAF(entry),
 172                                                                           &tinfo, fcinfo->flinfo));
 173 }
 174
 175
 176 Datum
 177 gbt_int2_union(PG_FUNCTION_ARGS)
 178 {
 179         GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
 180         void       *out = palloc(sizeof(int16KEY));
 181
 182         *(int *) PG_GETARG_POINTER(1) = sizeof(int16KEY);
 183         PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
 184 }
 185
 186
 187 Datum
 188 gbt_int2_penalty(PG_FUNCTION_ARGS)
 189 {
 190         int16KEY   *origentry = (int16KEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
 191         int16KEY   *newentry = (int16KEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
 192         float      *result = (float *) PG_GETARG_POINTER(2);
 193
 194         penalty_num(result, origentry->lower, origentry->upper, newentry->lower, newentry->upper);
 195
 196         PG_RETURN_POINTER(result);
 197 }
 198
 199 Datum
 200 gbt_int2_picksplit(PG_FUNCTION_ARGS)
 201 {
 202         PG_RETURN_POINTER(gbt_num_picksplit((GistEntryVector *) PG_GETARG_POINTER(0),
 203                                                                                 (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
 204                                                                                 &tinfo, fcinfo->flinfo));
 205 }
 206
 207 Datum
 208 gbt_int2_same(PG_FUNCTION_ARGS)
 209 {
 210         int16KEY   *b1 = (int16KEY *) PG_GETARG_POINTER(0);
 211         int16KEY   *b2 = (int16KEY *) PG_GETARG_POINTER(1);
 212         bool       *result = (bool *) PG_GETARG_POINTER(2);
 213
 214         *result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
 215         PG_RETURN_POINTER(result);
 216 }