SPI_cursor_close
Name
SPI_cursor_close -- Closes a cursor
Synopsis
SPI_cursor_close(portal)
Inputs
- Portal portal
- Portal containing cursor 
Description
SPI_cursor_close 
   closes a previously created cursor and releases its Portal storage.
Usage
   All open cursors are closed implicitly at transaction end.
   SPI_cursor_close need only be invoked if
   it is desirable to release resources sooner.