removed unused docs

and unused db entry

src/core/qgsfield.cpp

@@ -24,7 +24,6 @@
 #include <QIcon>
 #include <QLocale>
 #include <QJsonDocument>
-#include <QJsonObject>
 
 /***************************************************************************
  * This class is considered CRITICAL and any change MUST be accompanied with

src/providers/postgres/qgspostgresprovider.cpp

@@ -4221,11 +4221,8 @@ static QVariant parseJson( const QString &txt )
 {
   QVariant result;
   QJsonDocument jsonResponse = QJsonDocument::fromJson( txt.toUtf8() );
-  //it's null when no json format
+  //it's null if no json format
   result = jsonResponse.toVariant();
-
-  //TODO json/jsonb convert toVariantMap from QJsonObject in case it's a map etc.
-  //we can check there with jsonResponse.isArray if it's an array etc.
   return result;
 }
 

tests/testdata/provider/testdata_pg_json.sql

@@ -11,5 +11,4 @@ CREATE TABLE qgis_test.json
 INSERT INTO qgis_test.json(jvalue, jbvalue)
   VALUES
     ('[1,2,3]', '[4,5,6]'),
-    ('{"a":1,"b":2}', '{"c":4,"d":5}'),
-    ('123', '456');
+    ('{"a":1,"b":2}', '{"c":4,"d":5}');