SPI_register_relation — make an ephemeral named relation available by name in SPI queries
SPI_register_relation makes an ephemeral named relation, with associated information, available to queries planned and executed through the current SPI connection.
the ephemeral named relation registry entry
If the execution of the command was successful then the following (nonnegative) value will be returned:
if the relation has been successfully registered by name
On error, one of the following negative values is returned:
NULL or its
name field is
if called from an unconnected C function
if the name specified in the
name field of
enr is already registered for this connection
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