Function alter_relation_rename 

pub fn alter_relation_rename(
    definition: &str,
    new_name: &str,
) -> MetaResult<String>

alter_relation_rename renames a relation to a new name in its Create statement, and returns the updated definition raw sql. Note that the definition must be a Create statement and the new_name must be a valid identifier, it should be validated before calling this function. To update all relations that depend on the renamed one, use alter_relation_rename_refs.