Function table_relation_copy_data

src/include/access/tableam.h:1863–1867

* Copy data from `rel` into the new relfilenode `newrnode`. The new * relfilenode may not have storage associated before this function is * called. This is only supposed to be used for low level operations like * changing a relation's tablespace. */

 * changing a relation's tablespace.
 */
static inline void
table_relation_copy_data(Relation rel, const RelFileNode *newrnode)
{
	rel->rd_tableam->relation_copy_data(rel, newrnode);
}

/*
 * Copy data from `OldTable` into `NewTable`, as part of a CLUSTER or VACUUM