emotionbug opened a new pull request #194:
URL: https://github.com/apache/incubator-age/pull/194


   Since PG 12 does not recommend and not allow to use the use of Oids, so 
removed Oids.
   
   Since Oid uses 4Byte, it uses INT (SERIAL) type for compatibility. The 
SERIAL type generates a sequence of "$TABLE_NAME$_$COLUMN_NAME$_seq" and calls 
it to create a new ID.
   
   And, the SERIAL type is the same as the INT type, but due to the rule that a 
value less than 1 cannot exist, the case where it does not exist is considered 
0 (INVALID_AG_GRAPH_ID).


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