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src/Language/Interpreters/AndInterpreter.php

 {
     /**
      * Execute logical AND expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/EqualsInterpreter.php

 {
     /**
      * Execute logical EQUALITY expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/GreaterThanInterpreter.php

 {
     /**
      * Execute logical GREATER THAN expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/GreaterThanOrEqualInterpreter.php

 {
     /**
      * Execute logical GREATER THAN OR EQUAL expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/InInterpreter.php

 {
     /**
      * Execute logical IN expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/IsNotNullInterpreter.php

 {
     /**
      * Execute logical IS NOT NULL expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/IsNullInterpreter.php

 {
     /**
      * Execute logical IS NULL expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/LessThanInterpreter.php

 {
     /**
      * Execute logical LESS THAN expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/LessThanOrEqualInterpreter.php

 {
     /**
      * Execute logical LESS THAN OR EQUAL expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/LikeInterpreter.php

 {
     /**
      * Execute logical LIKE expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/NotEqualsInterpreter.php

 {
     /**
      * Execute logical NOT EQUAL expression
+     *
+     * @return mixed
      */
     public function execute()
     {

src/Language/Interpreters/NotInInterpreter.php

 {
     /**
      * Execute logical NOT IN expression
+     *
+     * @return mixed
      */
     public function execute()
     {