Add case-insensitive ordering

src/Tests.CSharp/CommonCSharpTests.cs

@@ -613,6 +613,18 @@ public static class CommonCSharpTests
             {
                 Expect.equal(Query.OrderBy([Field.Named("n:Test")], Dialect.SQLite), " ORDER BY data->>'Test'",
                     "Order By not constructed correctly for numeric field");
+            }),
+            TestCase("succeeds for PostgreSQL case-insensitive ordering", () =>
+            {
+                Expect.equal(Query.OrderBy([Field.Named("i:Test.Field DESC")], Dialect.PostgreSQL),
+                    " ORDER BY LOWER(data#>>'{Test,Field}') DESC",
+                    "Order By not constructed correctly for case-insensitive field");
+            }),
+            TestCase("succeeds for SQLite case-insensitive ordering", () =>
+            {
+                Expect.equal(Query.OrderBy([Field.Named("i:Test.Field ASC")], Dialect.SQLite),
+                    " ORDER BY data->>'Test'->>'Field' COLLATE NOCASE ASC",
+                    "Order By not constructed correctly for case-insensitive field");
             })
         ])
     ]);