SPI_finish
Description
  
   SPI_finish
  
  closes an existing connection to
   the SPI manager.  You must call this function after completing the
   SPI operations needed during your procedure's current invocation.
   You do not need to worry about making this happen, however, if you
   abort the transaction via
  
   elog(ERROR)
  
  .  In that
   case SPI will clean itself up automatically.
 
  If
  
   SPI_finish
  
  is called without having a valid
   connection, it will return
  
   SPI_ERROR_UNCONNECTED
  
  .
   There is no fundamental problem with this; it means that the SPI
   manager has nothing to do.
 
Return Value
- SPI_OK_FINISH
 - 
    
if properly disconnected
 - SPI_ERROR_UNCONNECTED
 - 
    
if called from an unconnected procedure