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          64 : PG_MODULE_MAGIC_EXT(
      11             :                     .name = "btree_gist",
      12             :                     .version = PG_VERSION
      13             : );
      14             : 
      15          46 : PG_FUNCTION_INFO_V1(gbt_decompress);
      16          12 : PG_FUNCTION_INFO_V1(gbtreekey_in);
      17          12 : PG_FUNCTION_INFO_V1(gbtreekey_out);
      18           6 : PG_FUNCTION_INFO_V1(gist_stratnum_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             :     PG_RETURN_VOID();           /* keep compiler quiet */
      37             : }
      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             :     PG_RETURN_VOID();           /* keep compiler quiet */
      48             : }
      49             : 
      50             : 
      51             : /*
      52             : ** GiST DeCompress methods
      53             : ** do not do anything.
      54             : */
      55             : Datum
      56      200256 : gbt_decompress(PG_FUNCTION_ARGS)
      57             : {
      58      200256 :     PG_RETURN_POINTER(PG_GETARG_POINTER(0));
      59             : }
      60             : 
      61             : /*
      62             :  * Returns the btree number for supported operators, otherwise invalid.
      63             :  */
      64             : Datum
      65          10 : gist_stratnum_btree(PG_FUNCTION_ARGS)
      66             : {
      67          10 :     CompareType cmptype = PG_GETARG_INT32(0);
      68             : 
      69          10 :     switch (cmptype)
      70             :     {
      71           8 :         case COMPARE_EQ:
      72           8 :             PG_RETURN_UINT16(BTEqualStrategyNumber);
      73           0 :         case COMPARE_LT:
      74           0 :             PG_RETURN_UINT16(BTLessStrategyNumber);
      75           0 :         case COMPARE_LE:
      76           0 :             PG_RETURN_UINT16(BTLessEqualStrategyNumber);
      77           0 :         case COMPARE_GT:
      78           0 :             PG_RETURN_UINT16(BTGreaterStrategyNumber);
      79           0 :         case COMPARE_GE:
      80           0 :             PG_RETURN_UINT16(BTGreaterEqualStrategyNumber);
      81           2 :         default:
      82           2 :             PG_RETURN_UINT16(InvalidStrategy);
      83             :     }
      84             : }