[#7183] Cannot ORDER BY null in PostgreSQL, when Field.sortAsc() has no parameters

jOOQ/src/main/java/org/jooq/impl/ConstantSortField.java

@@ -60,11 +60,16 @@ final class ConstantSortField<T> extends CustomField<T> {
     @Override
     public void accept(Context<?> ctx) {
         switch (ctx.family()) {
+            // [#6574] [#7183] Some databases do not allow for ORDER BY null clauses
 
 
 
 
 
+            case POSTGRES:
+                ctx.sql('(').visit(K_SELECT).sql(" 1)");
+                break;
+
             default:
                 ctx.visit(DSL.NULL().sortDefault());
                 break;