Fixed buildInCondition bug.

framework/db/QueryBuilder.php

@@ -592,11 +592,11 @@ class QueryBuilder extends \yii\base\Object
 			return $operator === 'IN' ? '0=1' : '';
 		}
 
-		if (is_array($column)) {
 		if (count($column) > 1) {
 			return $this->buildCompositeInCondition($operator, $column, $values);
-			} else {
+		} elseif (is_array($column)) {
 			$column = reset($column);
+		}
 		foreach ($values as $i => $value) {
 			if (is_array($value)) {
 				$value = isset($value[$column]) ? $value[$column] : null;
@@ -607,8 +607,6 @@ class QueryBuilder extends \yii\base\Object
 				$values[$i] = is_string($value) ? $this->db->quoteValue($value) : (string)$value;
 			}
 		}
-			}
-		}
 		if (strpos($column, '(') === false) {
 			$column = $this->db->quoteColumnName($column);
 		}