PHPLIB-293 Add support for a comment parameter to the aggregate command

docs/includes/apiargs-MongoDBCollection-method-aggregate-option.yaml

@@ -35,6 +35,18 @@ post: |
   version of MongoDB, this option will be ignored.
 ---
 arg_name: option
+name: comment
+type: string
+description: |
+  Users can specify an arbitrary string to help trace the operation through the
+  database profiler, currentOp, and logs.
+
+  .. versionadded:: 1.3
+interface: phpmethod
+operation: ~
+optional: true
+---
+arg_name: option
 name: hint
 type: string|array|object
 description: |

src/Operation/Aggregate.php

@@ -74,6 +74,9 @@ class Aggregate implements Executable
      *    This is not supported for server versions < 3.4 and will result in an
      *    exception at execution time if used.
      *
+     *  * comment (string): An arbitrary string to help trace the operation
+     *    through the database profiler, currentOp, and logs.
+     *
      *  * hint (string|document): The index to use. Specify either the index
      *    name as a string or the index key pattern as a document. If specified,
      *    then the query system will only consider plans using the hinted index.
@@ -150,6 +153,10 @@ public function __construct($databaseName, $collectionName, array $pipeline, arr
             throw InvalidArgumentException::invalidType('"collation" option', $options['collation'], 'array or object');
         }
 
+        if (isset($options['comment']) && ! is_string($options['comment'])) {
+            throw InvalidArgumentException::invalidType('"comment" option', $options['comment'], 'string');
+        }
+
         if (isset($options['hint']) && ! is_string($options['hint']) && ! is_array($options['hint']) && ! is_object($options['hint'])) {
             throw InvalidArgumentException::invalidType('"hint" option', $options['hint'], 'string or array or object');
         }
@@ -276,6 +283,12 @@ private function createCommand(Server $server, $isCursorSupported)
             $cmd['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
         }
 
+        foreach (['comment', 'maxTimeMS'] as $option) {
+            if (isset($this->options[$option])) {
+                $cmd[$option] = $this->options[$option];
+            }
+        }
+
         if (isset($this->options['collation'])) {
             $cmd['collation'] = (object) $this->options['collation'];
         }
@@ -284,10 +297,6 @@ private function createCommand(Server $server, $isCursorSupported)
             $cmd['hint'] = is_array($this->options['hint']) ? (object) $this->options['hint'] : $this->options['hint'];
         }
 
-        if (isset($this->options['maxTimeMS'])) {
-            $cmd['maxTimeMS'] = $this->options['maxTimeMS'];
-        }
-
         if (isset($this->options['readConcern'])) {
             $cmd['readConcern'] = \MongoDB\read_concern_as_document($this->options['readConcern']);
         }

tests/Operation/AggregateTest.php

@@ -44,6 +44,10 @@ public function provideInvalidConstructorOptions()
             $options[][] = ['collation' => $value];
         }
 
+        foreach ($this->getInvalidStringValues() as $value) {
+            $options[][] = ['comment' => $value];
+        }
+
         foreach ($this->getInvalidHintValues() as $value) {
             $options[][] = ['hint' => $value];
         }