SPI_finish — disconnect a C function 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 C
function'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 C function
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