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SPI_saveplan saves a passed plan (prepared by
SPI_prepare) in memory protected from freeing
by SPI_finish and by the transaction manager
and returns a pointer to the saved plan. This gives you the
ability to reuse prepared plans in the subsequent invocations of
your procedure in the current session. You may save the pointer
returned in a local variable. Always check if this pointer is
NULL or not either when preparing a plan or using
an already prepared plan in SPI_execp.
Pointer to the saved plan; NULL if unsuccessful. On error, SPI_result is set thus:
if plan is NULL
if called from an unconnected procedure