Changed SQL-Statements so that they work under Standard SQL not only MySQL

Author: Hendrik Donath

locallib.php

@@ -736,7 +736,8 @@ function pdfannotator_get_questions($courseid, $context, $questionfilter) {
     if ($questionfilter == 1) {
         $sql = $sql . ' AND NOT c.solved = 0 ';
     }
-    $sql = $sql . "GROUP BY a.id, p.name, p.usevotes, cm.id, c.id, a.page, a.pdfannotatorid, c.content, c.userid, c.visibility, c.timecreated, c.isdeleted, c.ishidden";    $params = array_merge([$courseid], $inparams);
+    $sql = $sql . "GROUP BY a.id, p.name, p.usevotes, cm.id, c.id, a.page, a.pdfannotatorid, c.content, c.userid, c.visibility, c.timecreated, c.isdeleted, c.ishidden";
+    $params = array_merge([$courseid], $inparams);
     $questions = $DB->get_records_sql($sql, $params);
 
     $seehidden = has_capability('mod/pdfannotator:seehiddencomments', $context);

version.php

@@ -25,6 +25,6 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = 'mod_pdfannotator'; // Full name of the plugin (used for diagnostics).
-$plugin->version   = 2020102300; // The current module version (Date: YYYYMMDDXX).
+$plugin->version   = 2020102301; // The current module version (Date: YYYYMMDDXX).
 $plugin->release  = 'PDF Annotator v1.4 release 4';
 $plugin->requires  = 2016112900; // Requires this Moodle version.