8e14408028
assuming comparison of atttypid is sufficient. In a dropped column atttypid will be 0, and we'd better check the physical-storage data to make sure the tupdescs are physically compatible. I do not believe there is a real risk before 8.0, since before that we only used this routine to compare successive states of the tupdesc for a particular relation. But 8.0's typcache.c might be comparing arbitrary tupdescs so we'd better play it safer.
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