SPI_connect opens a connection
from a procedure invocation to the SPI manager. You must call
this function if you want to execute commands through SPI. Some
utility SPI functions can be called from unconnected
If your procedure is already connected,
SPI_connect will return the error code
SPI_ERROR_CONNECT. This could
happen if a procedure that has called
SPI_connect directly calls another procedure
recursive calls to the SPI
manager are permitted when an SQL command called through SPI
invokes another function that uses SPI, directly nested calls to
SPI_finish are forbidden. (But see
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