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