On 2016/03/25 17:16, Etsuro Fujita wrote:
The approach that we discussed would minimize the code for the FDW author to write, by providing the support functions you proposed. I'll post a patch for that early next week.
I added two helper functions: GetFdwScanTupleExtraData and FillFdwScanTupleSysAttrs. The FDW author could use the former to get info about system attributes other than ctids and oids in fdw_scan_tlist during BeginForeignScan, and the latter to set values for these system attributes during IterateForeignScan (InvalidTransactionId for xmins/xmaxs, InvalidCommandId for cmins/cmaxs, and valid values for tableoids). Attached is a proposed patch for that. I also slightly simplified the changes to make_tuple_from_result_row and conversion_error_callback made by the postgres_fdw join pushdown patch. What do you think about that?
Best regards, Etsuro Fujita
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