PostgreSQL源码学习--删除数据#1，2

本节介绍heapam_tuple_delete和table_tuple_delete函数。

//src/backend/access/heap/heapam_handler.c

static TM_Result
heapam_tuple_delete(Relation relation, ItemPointer tid, CommandId cid,
				Snapshot snapshot, Snapshot crosscheck, bool wait,
				TM_FailureData *tmfd, bool changingPart)
{
	
	return heap_delete(relation, tid, cid, crosscheck, wait, tmfd, changingPart);
}

//src/backend/access/heap/heapam_handler.c

static inline TM_Result
table_tuple_delete(Relation rel, ItemPointer tid, CommandId cid,
			   Snapshot snapshot, Snapshot crosscheck, bool wait,
			   TM_FailureData *tmfd, bool changingPart)
{
	
	return rel->rd_tableam->tuple_delete(rel, tid, cid,
						 snapshot, crosscheck,
						 wait, tmfd, changingPart);
}