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Commit5408e23

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Allow to use HeapTupleData embedded in [Buffer]HeapTupleTableSlot.
That avoids having to care about the lifetime of theHeapTupleHeaderData passed to ExecStore[Buffer]HeapTuple(). Thatdoesn't make a huge difference for a plain HeapTupleTableSlot, but forBufferHeapTupleTableSlot it can be a significant advantage, avoidingthe need to materialize slots where it's inconvenient to provide aHeapTupleData with appropriate lifetime to point to the on-disk tuple.It's quite possible that we'll want to add support functions forconstructing HeapTuples using that embedded HeapTupleData, but for nowcallers do so themselves.Author: Andres FreundDiscussion:https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de
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‎src/include/executor/tuptable.h

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@@ -16,6 +16,7 @@
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#include"access/htup.h"
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#include"access/tupdesc.h"
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#include"access/htup_details.h"
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#include"storage/buf.h"
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/*----------
@@ -246,6 +247,7 @@ typedef struct HeapTupleTableSlot
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HeapTupletuple;/* physical tuple */
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#defineFIELDNO_HEAPTUPLETABLESLOT_OFF 2
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uint32off;/* saved state for slot_deform_heap_tuple */
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HeapTupleDatatupdata;/* optional workspace for storing tuple */
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}HeapTupleTableSlot;
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/* heap tuple residing in a buffer */

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