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d3b1b1f9d8
its second pass over the table. It has to start at block zero, else the "merge join" logic for detecting which TIDs are already in the index doesn't work. Hence, extend heapam.c's API so that callers can enable or disable syncscan. (I put in an option to disable buffer access strategy, too, just in case somebody needs it.) Per report from Hannes Dorbath.