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Commitadfa042

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Save a few cycles in EXPLAIN and related commands by not bothering to form
a physical tuple in do_tup_output(). A virtual tuple is easier to set upand also easier for most tuple receivers to process. Per my comment onRobert Haas' recent patch in this code.
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‎src/backend/executor/execTuples.c

Lines changed: 13 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.108 2009/07/22 17:00:20 tgl Exp $
18+
* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.109 2009/07/23 21:27:10 tgl Exp $
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*
2020
*-------------------------------------------------------------------------
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*/
@@ -1215,27 +1215,28 @@ begin_tup_output_tupdesc(DestReceiver *dest, TupleDesc tupdesc)
12151215

12161216
/*
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* write a single tuple
1218-
*
1219-
* XXX This could be made more efficient, since in reality we probably only
1220-
* need a virtual tuple.
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*/
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void
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do_tup_output(TupOutputState*tstate,Datum*values,bool*isnull)
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{
1225-
TupleDesctupdesc=tstate->slot->tts_tupleDescriptor;
1226-
HeapTupletuple;
1222+
TupleTableSlot*slot=tstate->slot;
1223+
intnatts=slot->tts_tupleDescriptor->natts;
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1228-
/*form a tuple */
1229-
tuple=heap_form_tuple(tupdesc,values,isnull);
1225+
/*make sure the slot is clear */
1226+
ExecClearTuple(slot);
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1231-
/* put it in a slot */
1232-
ExecStoreTuple(tuple,tstate->slot,InvalidBuffer, true);
1228+
/* insert data */
1229+
memcpy(slot->tts_values,values,natts*sizeof(Datum));
1230+
memcpy(slot->tts_isnull,isnull,natts*sizeof(bool));
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1232+
/* mark slot as containing a virtual tuple */
1233+
ExecStoreVirtualTuple(slot);
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/* send the tuple to the receiver */
1235-
(*tstate->dest->receiveSlot) (tstate->slot,tstate->dest);
1236+
(*tstate->dest->receiveSlot) (slot,tstate->dest);
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/* clean up */
1238-
ExecClearTuple(tstate->slot);
1239+
ExecClearTuple(slot);
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}
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/*

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