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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.
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
If one of the objects (a table, function, etc.) referenced by the
prepared plan is dropped during the session then the results of
SPI_execute_plan for this plan will be unpredictable.
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