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tableam: Add table_get_latest_tid, to wrap heap_get_latest_tid.

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This primarily is to allow WHERE CURRENT OF to continue to work as it
currently does. It's not clear to me that these semantics make sense
for every AM, but it works for the in-core heap, and the out of core
zheap. We can refine it further at a later point if necessary.

Author: Andres Freund
Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de
This commit is contained in:
Andres Freund
2019-03-25 17:14:48 -07:00
parent 71bdc99d0d
commit 2e3da03e9e
4 changed files with 25 additions and 14 deletions
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5
src/backend/utils/adt/tid.c
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@ -22,6 +22,7 @@
#include "access/heapam.h"
#include "access/sysattr.h"
#include "access/tableam.h"
#include "catalog/namespace.h"
#include "catalog/pg_type.h"
#include "libpq/pqformat.h"
@ -379,7 +380,7 @@ currtid_byreloid(PG_FUNCTION_ARGS)
ItemPointerCopy(tid, result);
snapshot = RegisterSnapshot(GetLatestSnapshot());
heap_get_latest_tid(rel, snapshot, result);
table_get_latest_tid(rel, snapshot, result);
UnregisterSnapshot(snapshot);
table_close(rel, AccessShareLock);
@ -414,7 +415,7 @@ currtid_byrelname(PG_FUNCTION_ARGS)
ItemPointerCopy(tid, result);
snapshot = RegisterSnapshot(GetLatestSnapshot());
heap_get_latest_tid(rel, snapshot, result);
table_get_latest_tid(rel, snapshot, result);
UnregisterSnapshot(snapshot);
table_close(rel, AccessShareLock);