plan: less allocation (pingcap#5302)

heiheipp · Dec 5, 2017 · c1b408a · c1b408a
1 parent a1b1bb4
commit c1b408a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/plan/predicate_push_down.go b/plan/predicate_push_down.go
@@ -345,8 +345,8 @@ func (p *LogicalAggregation) getGbyColIndex(col *expression.Column) int {
 // PredicatePushDown implements LogicalPlan PredicatePushDown interface.
 func (p *LogicalAggregation) PredicatePushDown(predicates []expression.Expression) (ret []expression.Expression, retPlan LogicalPlan) {
 	retPlan = p
-	var exprsOriginal []expression.Expression
 	var condsToPush []expression.Expression
+	exprsOriginal := make([]expression.Expression, 0, len(p.AggFuncs))
 	for _, fun := range p.AggFuncs {
 		exprsOriginal = append(exprsOriginal, fun.GetArgs()[0])
 	}