Update src/SqlAst/IfNullReturnTypeExtension.php

Add reference link to MySQL docs Co-authored-by: Markus Staab <[email protected]>
staabm · Apr 9, 2023 · 53e059c · 53e059c
1 parent 1f73daf
commit 53e059c
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/SqlAst/IfNullReturnTypeExtension.php b/src/SqlAst/IfNullReturnTypeExtension.php
@@ -47,6 +47,7 @@ public function getReturnType(FunctionCall $expression, QueryScope $scope): ?Typ
 
         // The result type is always the "more general" of the two args
         // in the order: string, float, integer.
+        // see https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#function_ifnull
         if ($this->isResultString($argType1NoNull, $argType2NoNull)) {
             $resultType = $resultType->toString();
         } elseif ($this->isResultFloat($argType1NoNull, $argType2NoNull)) {