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Another SELECT speedup: extract OIDs of column print functions

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only once per SELECT, not once per tuple.  10% here, 10% there,
pretty soon you're talking about real speedups ...
This commit is contained in:
Tom Lane
1999-01-27 00:36:28 +00:00
parent 36693c0525
commit 422221c90d
9 changed files with 413 additions and 231 deletions
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40
src/backend/executor/execMain.c
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@ -26,7 +26,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.63 1999/01/25 12:01:03 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.64 1999/01/27 00:36:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -66,9 +66,10 @@ static void EndPlan(Plan *plan, EState *estate);
static TupleTableSlot *ExecutePlan(EState *estate, Plan *plan,
Query *parseTree, CmdType operation,
int numberTuples, ScanDirection direction,
void (*printfunc) ());
static void ExecRetrieve(TupleTableSlot *slot, void (*printfunc) (),
EState *estate);
DestReceiver *destfunc);
static void ExecRetrieve(TupleTableSlot *slot,
DestReceiver *destfunc,
EState *estate);
static void ExecAppend(TupleTableSlot *slot, ItemPointer tupleid,
EState *estate);
static void ExecDelete(TupleTableSlot *slot, ItemPointer tupleid,
@ -171,7 +172,7 @@ ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count)
Plan *plan;
TupleTableSlot *result;
CommandDest dest;
void (*destination) ();
DestReceiver *destfunc;
/******************
* sanity checks
@ -188,10 +189,19 @@ ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count)
parseTree = queryDesc->parsetree;
plan = queryDesc->plantree;
dest = queryDesc->dest;
destination = (void (*) ()) DestToFunction(dest);
destfunc = DestToFunction(dest);
estate->es_processed = 0;
estate->es_lastoid = InvalidOid;
/******************
* FIXME: the dest setup function ought to be handed the tuple desc
* for the tuples to be output, but I'm not quite sure how to get that
* info at this point. For now, passing NULL is OK because no existing
* dest setup function actually uses the pointer.
******************
*/
(*destfunc->setup) (destfunc, (TupleDesc) NULL);
switch (feature)
{
@ -202,7 +212,7 @@ ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count)
operation,
ALL_TUPLES,
ForwardScanDirection,
destination);
destfunc);
break;
case EXEC_FOR:
result = ExecutePlan(estate,
@ -211,7 +221,7 @@ ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count)
operation,
count,
ForwardScanDirection,
destination);
destfunc);
break;
/******************
@ -225,7 +235,7 @@ ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count)
operation,
count,
BackwardScanDirection,
destination);
destfunc);
break;
/******************
@ -240,7 +250,7 @@ ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count)
operation,
ONE_TUPLE,
ForwardScanDirection,
destination);
destfunc);
break;
default:
result = NULL;
@ -248,6 +258,8 @@ ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count)
break;
}
(*destfunc->cleanup) (destfunc);
return result;
}
@ -745,7 +757,7 @@ ExecutePlan(EState *estate,
CmdType operation,
int numberTuples,
ScanDirection direction,
void (*printfunc) ())
DestReceiver* destfunc)
{
JunkFilter *junkfilter;
@ -905,7 +917,7 @@ ExecutePlan(EState *estate,
{
case CMD_SELECT:
ExecRetrieve(slot, /* slot containing tuple */
printfunc, /* print function */
destfunc, /* destination's tuple-receiver obj */
estate); /* */
result = slot;
break;
@ -961,7 +973,7 @@ ExecutePlan(EState *estate,
*/
static void
ExecRetrieve(TupleTableSlot *slot,
void (*printfunc) (),
DestReceiver *destfunc,
EState *estate)
{
HeapTuple tuple;
@ -988,7 +1000,7 @@ ExecRetrieve(TupleTableSlot *slot,
* send the tuple to the front end (or the screen)
******************
*/
(*printfunc) (tuple, attrtype);
(*destfunc->receiveTuple) (tuple, attrtype, destfunc);
IncrRetrieved();
(estate->es_processed)++;
}