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Commita04161f

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committed
Convert eval_const_expressions's long series of IsA tests into a switch.
This function has now grown enough cases that a switch seems appropriate.This results in a measurable speed improvement on some platforms, andshould certainly not hurt. The code's in need of a pgindent run now,though.Andres Freund
1 parent5943d40 commita04161f

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1 file changed

+31
-25
lines changed

1 file changed

+31
-25
lines changed

‎src/backend/optimizer/util/clauses.c‎

Lines changed: 31 additions & 25 deletions
Original file line numberDiff line numberDiff line change
@@ -2106,7 +2106,9 @@ eval_const_expressions_mutator(Node *node,
21062106
{
21072107
if (node==NULL)
21082108
returnNULL;
2109-
if (IsA(node,Param))
2109+
switch (nodeTag(node))
2110+
{
2111+
caseT_Param:
21102112
{
21112113
Param*param= (Param*)node;
21122114

@@ -2152,7 +2154,7 @@ eval_const_expressions_mutator(Node *node,
21522154
/* Not replaceable, so just copy the Param (no need to recurse) */
21532155
return (Node*)copyObject(param);
21542156
}
2155-
if (IsA(node,FuncExpr))
2157+
caseT_FuncExpr:
21562158
{
21572159
FuncExpr*expr= (FuncExpr*)node;
21582160
List*args;
@@ -2210,7 +2212,7 @@ eval_const_expressions_mutator(Node *node,
22102212
newexpr->location=expr->location;
22112213
return (Node*)newexpr;
22122214
}
2213-
if (IsA(node,OpExpr))
2215+
caseT_OpExpr:
22142216
{
22152217
OpExpr*expr= (OpExpr*)node;
22162218
List*args;
@@ -2275,7 +2277,7 @@ eval_const_expressions_mutator(Node *node,
22752277
newexpr->location=expr->location;
22762278
return (Node*)newexpr;
22772279
}
2278-
if (IsA(node,DistinctExpr))
2280+
caseT_DistinctExpr:
22792281
{
22802282
DistinctExpr*expr= (DistinctExpr*)node;
22812283
List*args;
@@ -2372,7 +2374,7 @@ eval_const_expressions_mutator(Node *node,
23722374
newexpr->location=expr->location;
23732375
return (Node*)newexpr;
23742376
}
2375-
if (IsA(node,BoolExpr))
2377+
caseT_BoolExpr:
23762378
{
23772379
BoolExpr*expr= (BoolExpr*)node;
23782380

@@ -2439,19 +2441,18 @@ eval_const_expressions_mutator(Node *node,
24392441
(int)expr->boolop);
24402442
break;
24412443
}
2444+
break;
24422445
}
2443-
if (IsA(node,SubPlan)||
2444-
IsA(node,AlternativeSubPlan))
2445-
{
2446+
caseT_SubPlan:
2447+
caseT_AlternativeSubPlan:
24462448
/*
24472449
* Return a SubPlan unchanged --- too late to do anything with it.
24482450
*
24492451
* XXX should we ereport() here instead? Probably this routine should
24502452
* never be invoked after SubPlan creation.
24512453
*/
24522454
returnnode;
2453-
}
2454-
if (IsA(node,RelabelType))
2455+
caseT_RelabelType:
24552456
{
24562457
/*
24572458
* If we can simplify the input to a constant, then we don't need the
@@ -2493,7 +2494,7 @@ eval_const_expressions_mutator(Node *node,
24932494
return (Node*)newrelabel;
24942495
}
24952496
}
2496-
if (IsA(node,CoerceViaIO))
2497+
caseT_CoerceViaIO:
24972498
{
24982499
CoerceViaIO*expr= (CoerceViaIO*)node;
24992500
Expr*arg;
@@ -2569,7 +2570,7 @@ eval_const_expressions_mutator(Node *node,
25692570
newexpr->location=expr->location;
25702571
return (Node*)newexpr;
25712572
}
2572-
if (IsA(node,ArrayCoerceExpr))
2573+
caseT_ArrayCoerceExpr:
25732574
{
25742575
ArrayCoerceExpr*expr= (ArrayCoerceExpr*)node;
25752576
Expr*arg;
@@ -2607,7 +2608,7 @@ eval_const_expressions_mutator(Node *node,
26072608
/* Else we must return the partially-simplified node */
26082609
return (Node*)newexpr;
26092610
}
2610-
if (IsA(node,CollateExpr))
2611+
caseT_CollateExpr:
26112612
{
26122613
/*
26132614
* If we can simplify the input to a constant, then we don't need the
@@ -2652,7 +2653,7 @@ eval_const_expressions_mutator(Node *node,
26522653
return (Node*)relabel;
26532654
}
26542655
}
2655-
if (IsA(node,CaseExpr))
2656+
caseT_CaseExpr:
26562657
{
26572658
/*----------
26582659
* CASE expressions can be simplified if there are constant
@@ -2783,7 +2784,7 @@ eval_const_expressions_mutator(Node *node,
27832784
newcase->location=caseexpr->location;
27842785
return (Node*)newcase;
27852786
}
2786-
if (IsA(node,CaseTestExpr))
2787+
caseT_CaseTestExpr:
27872788
{
27882789
/*
27892790
* If we know a constant test value for the current CASE construct,
@@ -2795,7 +2796,7 @@ eval_const_expressions_mutator(Node *node,
27952796
else
27962797
returncopyObject(node);
27972798
}
2798-
if (IsA(node,ArrayExpr))
2799+
caseT_ArrayExpr:
27992800
{
28002801
ArrayExpr*arrayexpr= (ArrayExpr*)node;
28012802
ArrayExpr*newarray;
@@ -2831,7 +2832,7 @@ eval_const_expressions_mutator(Node *node,
28312832

28322833
return (Node*)newarray;
28332834
}
2834-
if (IsA(node,CoalesceExpr))
2835+
caseT_CoalesceExpr:
28352836
{
28362837
CoalesceExpr*coalesceexpr= (CoalesceExpr*)node;
28372838
CoalesceExpr*newcoalesce;
@@ -2878,7 +2879,7 @@ eval_const_expressions_mutator(Node *node,
28782879
newcoalesce->location=coalesceexpr->location;
28792880
return (Node*)newcoalesce;
28802881
}
2881-
if (IsA(node,FieldSelect))
2882+
caseT_FieldSelect:
28822883
{
28832884
/*
28842885
* We can optimize field selection from a whole-row Var into a simple
@@ -2941,7 +2942,7 @@ eval_const_expressions_mutator(Node *node,
29412942
newfselect->resultcollid=fselect->resultcollid;
29422943
return (Node*)newfselect;
29432944
}
2944-
if (IsA(node,NullTest))
2945+
caseT_NullTest:
29452946
{
29462947
NullTest*ntest= (NullTest*)node;
29472948
NullTest*newntest;
@@ -3024,7 +3025,7 @@ eval_const_expressions_mutator(Node *node,
30243025
newntest->argisrow=ntest->argisrow;
30253026
return (Node*)newntest;
30263027
}
3027-
if (IsA(node,BooleanTest))
3028+
caseT_BooleanTest:
30283029
{
30293030
BooleanTest*btest= (BooleanTest*)node;
30303031
BooleanTest*newbtest;
@@ -3076,19 +3077,24 @@ eval_const_expressions_mutator(Node *node,
30763077
newbtest->booltesttype=btest->booltesttype;
30773078
return (Node*)newbtest;
30783079
}
3079-
if (IsA(node,PlaceHolderVar)&&context->estimate)
3080-
{
3080+
caseT_PlaceHolderVar:
30813081
/*
30823082
* In estimation mode, just strip the PlaceHolderVar node altogether;
30833083
* this amounts to estimating that the contained value won't be forced
30843084
* to null by an outer join. In regular mode we just use the default
30853085
* behavior (ie, simplify the expression but leave the PlaceHolderVar
30863086
* node intact).
30873087
*/
3088-
PlaceHolderVar*phv= (PlaceHolderVar*)node;
3088+
if (context->estimate)
3089+
{
3090+
PlaceHolderVar*phv= (PlaceHolderVar*)node;
30893091

3090-
returneval_const_expressions_mutator((Node*)phv->phexpr,
3091-
context);
3092+
returneval_const_expressions_mutator((Node*)phv->phexpr,
3093+
context);
3094+
}
3095+
break;
3096+
default:
3097+
break;
30923098
}
30933099

30943100
/*

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