diff --git a/executor/aggregate_test.go b/executor/aggregate_test.go
index abe7a8a92364c..06e632002d0b3 100644
--- a/executor/aggregate_test.go
+++ b/executor/aggregate_test.go
@@ -565,7 +565,7 @@ func (s *testSuite) TestIssue13652(c *C) {
 	tk.MustQuery("select a from t group by +a")
 	tk.MustQuery("select a from t group by ((+a))")
 	_, err := tk.Exec("select a from t group by (-a)")
-	c.Assert(err.Error(), Equals, "[planner:1055]Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.t.a' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by")
+	c.Assert(err.Error(), Equals, "[planner:1055]Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'a' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by")
 }
 
 func (s *testSuite) TestHaving(c *C) {
diff --git a/planner/core/logical_plan_builder.go b/planner/core/logical_plan_builder.go
index b0e532fe733a0..e7440cfc3bd19 100644
--- a/planner/core/logical_plan_builder.go
+++ b/planner/core/logical_plan_builder.go
@@ -1538,7 +1538,7 @@ func (b *planBuilder) checkOnlyFullGroupByWithGroupClause(p LogicalPlan, sel *as
 	gbyExprs := make([]ast.ExprNode, 0, len(sel.Fields.Fields))
 	schema := p.Schema()
 	for _, byItem := range sel.GroupBy.Items {
-		expr := getInnerFromParentheses(byItem.Expr)
+		expr := getInnerFromParenthesesAndUnaryPlus(byItem.Expr)
 		if colExpr, ok := expr.(*ast.ColumnNameExpr); ok {
 			col, err := schema.FindColumn(colExpr.Name)
 			if err != nil || col == nil {