Fixed encoding of empty ArrayExpression for PostgreSQL

framework/CHANGELOG.md

@@ -9,6 +9,7 @@ Yii Framework 2 Change Log
 - Bug #15822: Fixed `yii\base\Component::off()` not to throw an exception when handler does not exist (silverfire)
 - Bug #15817: Fixed support of deprecated array format type casting in `yii\db\Command::bindValues()` (silverfire)
 - Bug #15804: Fixed `null` values handling for PostgresSQL arrays (silverfire)
+- Bug: Fixed encoding of empty `yii\db\ArrayExpression` for PostgreSQL (silverfire)
 
 
 2.0.14.1 February 24, 2018

framework/db/pgsql/ArrayExpressionBuilder.php

@@ -42,9 +42,6 @@ class ArrayExpressionBuilder implements ExpressionBuilderInterface
         }
 
         $placeholders = $this->buildPlaceholders($expression, $params);
-        if (empty($placeholders)) {
-            return "'{}'";
-        }
 
         return 'ARRAY[' . implode(', ', $placeholders) . ']' . $this->getTypehint($expression);
     }

framework/db/pgsql/ArrayParser.php

@@ -102,8 +102,6 @@ class ArrayParser
 
         if (!$isQuoted && $result === 'NULL') {
             $result = null;
-        } elseif ($isQuoted && $result === '{}') {
-            $result = [];
         }
 
         return $result;