[BUG] pg9.4.10 Logical decoding did not get the correct oldtuplelen

hi team:

I found a postgresql 9.4.10 Logical decoding problem
heapam.c:6976 xlog store incorrect oldtuplen when tuplelen is greater than the value field of uint16.


a uint32 variable is assigned to uint16


The structure that holds the oldkey length is:
typedef struct xl_heap_header_len
{
	uint16		t_len;
	xl_heap_header header;
} xl_heap_header_len;



The problem will lead to logic decoding failure when oldtuplene > 65535 and relreplident = FULL.
The table that triggers the problem is usually relreplident = FULL.