Line data    Source code

       1              : /*
       2              :  * contrib/btree_gist/btree_gist.c
       3              :  */
       4              : #include "postgres.h"
       5              : 
       6              : #include "access/cmptype.h"
       7              : #include "access/stratnum.h"
       8              : #include "utils/builtins.h"
       9              : 
      10            0 : PG_MODULE_MAGIC_EXT(
      11              :                                         .name = "btree_gist",
      12              :                                         .version = PG_VERSION
      13              : );
      14              : 
      15            0 : PG_FUNCTION_INFO_V1(gbt_decompress);
      16            0 : PG_FUNCTION_INFO_V1(gbtreekey_in);
      17            0 : PG_FUNCTION_INFO_V1(gbtreekey_out);
      18            0 : PG_FUNCTION_INFO_V1(gist_translate_cmptype_btree);
      19              : 
      20              : /**************************************************
      21              :  * In/Out for keys
      22              :  **************************************************/
      23              : 
      24              : 
      25              : Datum
      26            0 : gbtreekey_in(PG_FUNCTION_ARGS)
      27              : {
      28            0 :         Oid                     typioparam = PG_GETARG_OID(1);
      29              : 
      30            0 :         ereport(ERROR,
      31              :                         (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
      32              :                          errmsg("cannot accept a value of type %s",
      33              :                                         format_type_extended(typioparam, -1,
      34              :                                                                                  FORMAT_TYPE_ALLOW_INVALID))));
      35              : 
      36            0 :         PG_RETURN_VOID();                       /* keep compiler quiet */
      37            0 : }
      38              : 
      39              : Datum
      40            0 : gbtreekey_out(PG_FUNCTION_ARGS)
      41              : {
      42              :         /* Sadly, we do not receive any indication of the specific type */
      43            0 :         ereport(ERROR,
      44              :                         (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
      45              :                          errmsg("cannot display a value of type %s", "gbtreekey?")));
      46              : 
      47            0 :         PG_RETURN_VOID();                       /* keep compiler quiet */
      48              : }
      49              : 
      50              : 
      51              : /*
      52              : ** GiST DeCompress methods
      53              : ** do not do anything.
      54              : */
      55              : Datum
      56            0 : gbt_decompress(PG_FUNCTION_ARGS)
      57              : {
      58            0 :         PG_RETURN_POINTER(PG_GETARG_POINTER(0));
      59              : }
      60              : 
      61              : /*
      62              :  * Returns the btree number for supported operators, otherwise invalid.
      63              :  */
      64              : Datum
      65            0 : gist_translate_cmptype_btree(PG_FUNCTION_ARGS)
      66              : {
      67            0 :         CompareType cmptype = PG_GETARG_INT32(0);
      68              : 
      69            0 :         switch (cmptype)
      70              :         {
      71              :                 case COMPARE_EQ:
      72            0 :                         PG_RETURN_UINT16(BTEqualStrategyNumber);
      73              :                 case COMPARE_LT:
      74            0 :                         PG_RETURN_UINT16(BTLessStrategyNumber);
      75              :                 case COMPARE_LE:
      76            0 :                         PG_RETURN_UINT16(BTLessEqualStrategyNumber);
      77              :                 case COMPARE_GT:
      78            0 :                         PG_RETURN_UINT16(BTGreaterStrategyNumber);
      79              :                 case COMPARE_GE:
      80            0 :                         PG_RETURN_UINT16(BTGreaterEqualStrategyNumber);
      81              :                 default:
      82            0 :                         PG_RETURN_UINT16(InvalidStrategy);
      83              :         }
      84            0 : }