Line data    Source code

       1             : /*
       2             :  * contrib/btree_gist/btree_uuid.c
       3             :  */
       4             : #include "postgres.h"
       5             : 
       6             : #include "btree_gist.h"
       7             : #include "btree_utils_num.h"
       8             : #include "port/pg_bswap.h"
       9             : #include "utils/uuid.h"
      10             : 
      11             : typedef struct
      12             : {
      13             :     pg_uuid_t   lower,
      14             :                 upper;
      15             : } uuidKEY;
      16             : 
      17             : 
      18             : /*
      19             :  * UUID ops
      20             :  */
      21           4 : PG_FUNCTION_INFO_V1(gbt_uuid_compress);
      22           4 : PG_FUNCTION_INFO_V1(gbt_uuid_fetch);
      23           4 : PG_FUNCTION_INFO_V1(gbt_uuid_union);
      24           4 : PG_FUNCTION_INFO_V1(gbt_uuid_picksplit);
      25           4 : PG_FUNCTION_INFO_V1(gbt_uuid_consistent);
      26           4 : PG_FUNCTION_INFO_V1(gbt_uuid_penalty);
      27           4 : PG_FUNCTION_INFO_V1(gbt_uuid_same);
      28             : 
      29             : 
      30             : static int
      31       17606 : uuid_internal_cmp(const pg_uuid_t *arg1, const pg_uuid_t *arg2)
      32             : {
      33       17606 :     return memcmp(arg1->data, arg2->data, UUID_LEN);
      34             : }
      35             : 
      36             : static bool
      37        2794 : gbt_uuidgt(const void *a, const void *b, FmgrInfo *flinfo)
      38             : {
      39        2794 :     return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) > 0;
      40             : }
      41             : 
      42             : static bool
      43         616 : gbt_uuidge(const void *a, const void *b, FmgrInfo *flinfo)
      44             : {
      45         616 :     return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) >= 0;
      46             : }
      47             : 
      48             : static bool
      49        2052 : gbt_uuideq(const void *a, const void *b, FmgrInfo *flinfo)
      50             : {
      51        2052 :     return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) == 0;
      52             : }
      53             : 
      54             : static bool
      55         908 : gbt_uuidle(const void *a, const void *b, FmgrInfo *flinfo)
      56             : {
      57         908 :     return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) <= 0;
      58             : }
      59             : 
      60             : static bool
      61        3074 : gbt_uuidlt(const void *a, const void *b, FmgrInfo *flinfo)
      62             : {
      63        3074 :     return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) < 0;
      64             : }
      65             : 
      66             : static int
      67        8162 : gbt_uuidkey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
      68             : {
      69        8162 :     uuidKEY    *ia = (uuidKEY *) (((const Nsrt *) a)->t);
      70        8162 :     uuidKEY    *ib = (uuidKEY *) (((const Nsrt *) b)->t);
      71             :     int         res;
      72             : 
      73        8162 :     res = uuid_internal_cmp(&ia->lower, &ib->lower);
      74        8162 :     if (res == 0)
      75           0 :         res = uuid_internal_cmp(&ia->upper, &ib->upper);
      76        8162 :     return res;
      77             : }
      78             : 
      79             : 
      80             : static const gbtree_ninfo tinfo =
      81             : {
      82             :     gbt_t_uuid,
      83             :     UUID_LEN,
      84             :     32,                         /* sizeof(gbtreekey32) */
      85             :     gbt_uuidgt,
      86             :     gbt_uuidge,
      87             :     gbt_uuideq,
      88             :     gbt_uuidle,
      89             :     gbt_uuidlt,
      90             :     gbt_uuidkey_cmp,
      91             :     NULL
      92             : };
      93             : 
      94             : 
      95             : /**************************************************
      96             :  * uuid ops
      97             :  **************************************************/
      98             : 
      99             : 
     100             : Datum
     101        1232 : gbt_uuid_compress(PG_FUNCTION_ARGS)
     102             : {
     103        1232 :     GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
     104             :     GISTENTRY  *retval;
     105             : 
     106        1232 :     if (entry->leafkey)
     107             :     {
     108        1206 :         char       *r = (char *) palloc(2 * UUID_LEN);
     109        1206 :         pg_uuid_t  *key = DatumGetUUIDP(entry->key);
     110             : 
     111        1206 :         retval = palloc(sizeof(GISTENTRY));
     112             : 
     113        1206 :         memcpy(r, key, UUID_LEN);
     114        1206 :         memcpy(r + UUID_LEN, key, UUID_LEN);
     115        1206 :         gistentryinit(*retval, PointerGetDatum(r),
     116             :                       entry->rel, entry->page,
     117             :                       entry->offset, false);
     118             :     }
     119             :     else
     120          26 :         retval = entry;
     121             : 
     122        1232 :     PG_RETURN_POINTER(retval);
     123             : }
     124             : 
     125             : Datum
     126           0 : gbt_uuid_fetch(PG_FUNCTION_ARGS)
     127             : {
     128           0 :     GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
     129             : 
     130           0 :     PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
     131             : }
     132             : 
     133             : Datum
     134        3274 : gbt_uuid_consistent(PG_FUNCTION_ARGS)
     135             : {
     136        3274 :     GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
     137        3274 :     pg_uuid_t  *query = PG_GETARG_UUID_P(1);
     138        3274 :     StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
     139             : 
     140             :     /* Oid      subtype = PG_GETARG_OID(3); */
     141        3274 :     bool       *recheck = (bool *) PG_GETARG_POINTER(4);
     142        3274 :     uuidKEY    *kkk = (uuidKEY *) DatumGetPointer(entry->key);
     143             :     GBT_NUMKEY_R key;
     144             : 
     145             :     /* All cases served by this function are exact */
     146        3274 :     *recheck = false;
     147             : 
     148        3274 :     key.lower = (GBT_NUMKEY *) &kkk->lower;
     149        3274 :     key.upper = (GBT_NUMKEY *) &kkk->upper;
     150             : 
     151        3274 :     PG_RETURN_BOOL(gbt_num_consistent(&key, (void *) query, &strategy,
     152             :                                       GIST_LEAF(entry), &tinfo,
     153             :                                       fcinfo->flinfo));
     154             : }
     155             : 
     156             : Datum
     157         894 : gbt_uuid_union(PG_FUNCTION_ARGS)
     158             : {
     159         894 :     GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
     160         894 :     void       *out = palloc(sizeof(uuidKEY));
     161             : 
     162         894 :     *(int *) PG_GETARG_POINTER(1) = sizeof(uuidKEY);
     163         894 :     PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
     164             : }
     165             : 
     166             : /*
     167             :  * Convert a uuid to a "double" value for estimating sizes of ranges.
     168             :  */
     169             : static double
     170        9336 : uuid_2_double(const pg_uuid_t *u)
     171             : {
     172             :     uint64      uu[2];
     173        9336 :     const double two64 = 18446744073709551616.0;    /* 2^64 */
     174             : 
     175             :     /* Source data may not be suitably aligned, so copy */
     176        9336 :     memcpy(uu, u->data, UUID_LEN);
     177             : 
     178             :     /*
     179             :      * uuid values should be considered as big-endian numbers, since that
     180             :      * corresponds to how memcmp will compare them.  On a little-endian
     181             :      * machine, byte-swap each half so we can use native uint64 arithmetic.
     182             :      */
     183             : #ifndef WORDS_BIGENDIAN
     184        9336 :     uu[0] = pg_bswap64(uu[0]);
     185        9336 :     uu[1] = pg_bswap64(uu[1]);
     186             : #endif
     187             : 
     188             :     /*
     189             :      * 2^128 is about 3.4e38, which in theory could exceed the range of
     190             :      * "double" (POSIX only requires 1e37).  To avoid any risk of overflow,
     191             :      * put the decimal point between the two halves rather than treating the
     192             :      * uuid value as a 128-bit integer.
     193             :      */
     194        9336 :     return (double) uu[0] + (double) uu[1] / two64;
     195             : }
     196             : 
     197             : Datum
     198        2334 : gbt_uuid_penalty(PG_FUNCTION_ARGS)
     199             : {
     200        2334 :     uuidKEY    *origentry = (uuidKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
     201        2334 :     uuidKEY    *newentry = (uuidKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
     202        2334 :     float      *result = (float *) PG_GETARG_POINTER(2);
     203             :     double      olower,
     204             :                 oupper,
     205             :                 nlower,
     206             :                 nupper;
     207             : 
     208        2334 :     olower = uuid_2_double(&origentry->lower);
     209        2334 :     oupper = uuid_2_double(&origentry->upper);
     210        2334 :     nlower = uuid_2_double(&newentry->lower);
     211        2334 :     nupper = uuid_2_double(&newentry->upper);
     212             : 
     213        2334 :     penalty_num(result, olower, oupper, nlower, nupper);
     214             : 
     215        2334 :     PG_RETURN_POINTER(result);
     216             : }
     217             : 
     218             : Datum
     219           6 : gbt_uuid_picksplit(PG_FUNCTION_ARGS)
     220             : {
     221           6 :     PG_RETURN_POINTER(gbt_num_picksplit((GistEntryVector *) PG_GETARG_POINTER(0),
     222             :                                         (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
     223             :                                         &tinfo, fcinfo->flinfo));
     224             : }
     225             : 
     226             : Datum
     227         892 : gbt_uuid_same(PG_FUNCTION_ARGS)
     228             : {
     229         892 :     uuidKEY    *b1 = (uuidKEY *) PG_GETARG_POINTER(0);
     230         892 :     uuidKEY    *b2 = (uuidKEY *) PG_GETARG_POINTER(1);
     231         892 :     bool       *result = (bool *) PG_GETARG_POINTER(2);
     232             : 
     233         892 :     *result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
     234         892 :     PG_RETURN_POINTER(result);
     235             : }