SPI_unregister_relation — remove an ephemeral named relation from the registry
int SPI_unregister_relation(const char * name)
   SPI_unregister_relation removes an ephemeral named
   relation from the registry for the current connection.
  
const char * namethe relation registry entry name
If the execution of the command was successful then the following (nonnegative) value will be returned:
SPI_OK_REL_UNREGISTERif the tuplestore has been successfully removed from the registry
On error, one of the following negative values is returned:
SPI_ERROR_ARGUMENT
       if name is NULL
      
SPI_ERROR_UNCONNECTEDif called from an unconnected C function
SPI_ERROR_REL_NOT_FOUND
       if name is not found in the registry for the
       current connection