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tableam: Add and use table_fetch_row_version().

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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
This commit is contained in:
Andres Freund
2019-03-25 00:13:42 -07:00
parent c77e12208c
commit 9a8ee1dc65
9 changed files with 91 additions and 111 deletions
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1
src/backend/access/table/tableamapi.c
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@ -62,6 +62,7 @@ GetTableAmRoutine(Oid amhandler)
Assert(routine->index_fetch_end != NULL);
Assert(routine->index_fetch_tuple != NULL);
Assert(routine->tuple_fetch_row_version != NULL);
Assert(routine->tuple_satisfies_snapshot != NULL);
Assert(routine->tuple_insert != NULL);