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Avoid extra AggCheckCallContext() checks in ordered-set aggregates.

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In the transition functions, we don't really need to recheck this after the
first call.  I had been feeling paranoid about possibly getting a non-null
argument value in some other context; but it's probably game over anyway
if we have a non-null "internal" value that's not what we are expecting.

In the final functions, the general convention in pre-existing final
functions seems to be that an Assert() is good enough, so do it like that
here too.

This seems to save a few tenths of a percent of overall query runtime,
which isn't much, but still it's just overhead if there's not a plausible
case where the checks would fire.
This commit is contained in:
Tom Lane 2014-01-08 14:33:52 -05:00
parent e6336b8b57
commit 847e46abc9
1 changed files with 9 additions and 33 deletions
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42
src/backend/utils/adt/orderedsetaggs.c
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@ -122,8 +122,8 @@ ordered_set_startup(FunctionCallInfo fcinfo, bool use_tuples)
int numSortCols;
/*
* Check we're called as aggregate, and get the Agg node's
* group-lifespan context
* Check we're called as aggregate (and not a window function), and
* get the Agg node's group-lifespan context
*/
if (AggCheckCallContext(fcinfo, &gcontext) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
@ -356,12 +356,7 @@ ordered_set_transition(PG_FUNCTION_ARGS)
if (PG_ARGISNULL(0))
osastate = ordered_set_startup(fcinfo, false);
else
{
/* safety check */
if (AggCheckCallContext(fcinfo, NULL) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
}
/* Load the datum into the tuplesort object, but only if it's not null */
if (!PG_ARGISNULL(1))
@ -389,12 +384,7 @@ ordered_set_transition_multi(PG_FUNCTION_ARGS)
if (PG_ARGISNULL(0))
osastate = ordered_set_startup(fcinfo, true);
else
{
/* safety check */
if (AggCheckCallContext(fcinfo, NULL) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
}
/* Form a tuple from all the other inputs besides the transition value */
slot = osastate->qstate->tupslot;
@ -435,9 +425,7 @@ percentile_disc_final(PG_FUNCTION_ARGS)
bool isnull;
int64 rownum;
/* safety check */
if (AggCheckCallContext(fcinfo, NULL) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
/* Get and check the percentile argument */
if (PG_ARGISNULL(1))
@ -542,9 +530,7 @@ percentile_cont_final_common(FunctionCallInfo fcinfo,
double proportion;
bool isnull;
/* safety check */
if (AggCheckCallContext(fcinfo, NULL) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
/* Get and check the percentile argument */
if (PG_ARGISNULL(1))
@ -752,9 +738,7 @@ percentile_disc_multi_final(PG_FUNCTION_ARGS)
bool isnull = true;
int i;
/* safety check */
if (AggCheckCallContext(fcinfo, NULL) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
/* If there were no regular rows, the result is NULL */
if (PG_ARGISNULL(0))
@ -875,9 +859,7 @@ percentile_cont_multi_final_common(FunctionCallInfo fcinfo,
bool isnull;
int i;
/* safety check */
if (AggCheckCallContext(fcinfo, NULL) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
/* If there were no regular rows, the result is NULL */
if (PG_ARGISNULL(0))
@ -1045,9 +1027,7 @@ mode_final(PG_FUNCTION_ARGS)
FmgrInfo *equalfn;
bool shouldfree;
/* safety check */
if (AggCheckCallContext(fcinfo, NULL) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
/* If there were no regular rows, the result is NULL */
if (PG_ARGISNULL(0))
@ -1173,9 +1153,7 @@ hypothetical_rank_common(FunctionCallInfo fcinfo, int flag,
TupleTableSlot *slot;
int i;
/* safety check */
if (AggCheckCallContext(fcinfo, NULL) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
/* If there were no regular rows, the rank is always 1 */
if (PG_ARGISNULL(0))
@ -1305,9 +1283,7 @@ hypothetical_dense_rank_final(PG_FUNCTION_ARGS)
MemoryContext tmpcontext;
int i;
/* safety check */
if (AggCheckCallContext(fcinfo, NULL) != AGG_CONTEXT_AGGREGATE)
elog(ERROR, "ordered-set aggregate called in non-aggregate context");
Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
/* If there were no regular rows, the rank is always 1 */
if (PG_ARGISNULL(0))