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Allow to use HeapTupleData embedded in [Buffer]HeapTupleTableSlot.

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That avoids having to care about the lifetime of the
HeapTupleHeaderData passed to ExecStore[Buffer]HeapTuple(). That
doesn't make a huge difference for a plain HeapTupleTableSlot, but for
BufferHeapTupleTableSlot it can be a significant advantage, avoiding
the need to materialize slots where it's inconvenient to provide a
HeapTupleData with appropriate lifetime to point to the on-disk tuple.

It's quite possible that we'll want to add support functions for
constructing HeapTuples using that embedded HeapTupleData, but for now
callers do so themselves.

Author: Andres Freund
Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de
This commit is contained in:
Andres Freund
2019-02-26 18:15:59 -08:00
parent 8aa02b52db
commit 5408e233f0
1 changed files with 2 additions and 0 deletions
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2
src/include/executor/tuptable.h
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@ -16,6 +16,7 @@
#include "access/htup.h"
#include "access/tupdesc.h"
#include "access/htup_details.h"
#include "storage/buf.h"
/*----------
@ -246,6 +247,7 @@ typedef struct HeapTupleTableSlot
HeapTuple tuple; /* physical tuple */
#define FIELDNO_HEAPTUPLETABLESLOT_OFF 2
uint32 off; /* saved state for slot_deform_heap_tuple */
HeapTupleData tupdata; /* optional workspace for storing tuple */
} HeapTupleTableSlot;
/* heap tuple residing in a buffer */