SPI_getrelname
Name
SPI_getrelname -- return the name of the specified relation
Synopsis
char * SPI_getrelname(Relation rel)
Description
SPI_getrelname returns a copy of the name of the specified relation. (You can use pfree to release the copy of the name when you don't need it anymore.) 
Arguments
- Relation rel
-  input relation  
Return Value
 The name of the specified relation.