SPI_finish — disconnect a procedure from the SPI manager
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 properly disconnected
if called from an unconnected procedure