proper fix for #8844, convert array before using it

fixes #9415

framework/CHANGELOG.md

@@ -5,6 +5,7 @@ Yii Framework 2 Change Log
 -----------------------
 
 - Bug #8723: Fixed `yii\helpers\VarDumper::export()` unable to export circle referenced objects with `Closure` (klimov-paul)
+- Bug #9415: Fixed regression in 2.0.6 where on Oracle DB `PDO::ATTR_CASE = PDO::CASE_UPPER` did not work anymore (cebe)
 - Chg #9369: `Yii::$app->user->can()` now returns `false` instead of erroring in case `authManager` component is not configured (creocoder)
 - Chg #9411: `DetailView` now automatically sets container tag ID in case it's not specified (samdark)
 

framework/db/oci/Schema.php

@@ -280,14 +280,14 @@ SQL;
         ]);
         $constraints = [];
         foreach ($command->queryAll() as $row) {
+            if ($this->db->slavePdo->getAttribute(\PDO::ATTR_CASE) === \PDO::CASE_LOWER) {
+                $row = array_change_key_case($row, CASE_UPPER);
+            }
             if ($row['CONSTRAINT_TYPE'] !== 'R') {
                 // this condition is not checked in SQL WHERE because of an Oracle Bug:
                 // see https://github.com/yiisoft/yii2/pull/8844
                 continue;
             }
-            if ($this->db->slavePdo->getAttribute(\PDO::ATTR_CASE) === \PDO::CASE_LOWER) {
-                $row = array_change_key_case($row, CASE_UPPER);
-            }
             $name = $row['CONSTRAINT_NAME'];
             if (!isset($constraints[$name])) {
                 $constraints[$name] = [