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This is essentially the tableam version of heapam_fetch(), i.e. fetching a tuple identified by a tid, performing visibility checks. Note that this different from table_index_fetch_tuple(), which is for index lookups. It therefore has to handle a tid pointing to an earlier version of a tuple if the AM uses an optimization like heap's HOT. Add comments to that end. This commit removes the stats_relation argument from heap_fetch, as it's been unused for a long time. Author: Andres Freund Reviewed-By: Haribabu Kommi Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de