added more general mysql optimization tips (#384)

Co-authored-by: Markus Staab <[email protected]>

Author: staabm

src/Rules/QueryPlanAnalyzerRule.php

@@ -131,6 +131,7 @@ private function analyze(CallLike $callLike, Scope $scope): array
                             $table
                         ))
                         ->line($callLike->getLine())
+                        ->tip('see Mysql Docs https://dev.mysql.com/doc/refman/8.0/en/select-optimization.html')
                         ->build();
                 }
             } else {
@@ -152,6 +153,7 @@ private function analyze(CallLike $callLike, Scope $scope): array
                             $table
                         ))
                         ->line($callLike->getLine())
+                        ->tip('see Mysql Docs https://dev.mysql.com/doc/refman/8.0/en/select-optimization.html')
                         ->build();
                 }
             }

tests/rules/QueryPlanAnalyzerRuleTest.php

@@ -54,18 +54,23 @@ public function testNotUsingIndex(): void
         $this->numberOfRowsNotRequiringIndex = 2;
 
         $proposal = "\n\nConsider optimizing the query.\nIn some cases this is not a problem and this error should be ignored.";
+        $tip = 'see Mysql Docs https://dev.mysql.com/doc/refman/8.0/en/select-optimization.html';
+
         $this->analyse([__DIR__.'/data/query-plan-analyzer.php'], [
             [
                 "Query is not using an index on table 'ada'.".$proposal,
                 12,
+                $tip,
             ],
             [
                 "Query is not using an index on table 'ada'.".$proposal,
                 17,
+                $tip,
             ],
             [
                 "Query is not using an index on table 'ada'.".$proposal,
                 22,
+                $tip,
             ],
         ]);
     }