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Previously, querying the xmin column of a single postgres_fdw foreign table fetched the tuple length, xmax the typmod, and cmin or cmax the composite type OID of the tuple. However, when you queried several such tables and the join got shipped to the remote side, these columns ended up containing the remote values of the corresponding columns. Both behaviors are rather unprincipled, the former for obvious reasons and the latter because the remote values of these columns don't have any local significance; our transaction IDs are in a different space than those of the remote machine. Clean this up by setting all of these fields to 0 in both cases. Also fix the handling of tableoid to be sane. Robert Haas and Ashutosh Bapat, reviewed by Etsuro Fujita. |
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postgres_fdw.out |