When selecting both a dereference field and a dotted field with the same name in MongoDB, the dereference field returns NULL

[krvikash]

This is a regression after #17710 merge.

    @Test
    public void test2()
    {
        String tableName = "test" + randomNameSuffix();

        Document document = new Document()
                .append("_id", new ObjectId("5126bbf64aed4daf9e2ab771"))
                .append("dotted.field", "foo")
                .append("dotted", new Document("field", "bar"));
        client.getDatabase("test").getCollection(tableName).insertOne(document);

        assertThat(query("SELECT \"dotted.field\", dotted.field FROM test." + tableName))
                .skippingTypesCheck()
                .matches("VALUES (NULL, NULL)");

        assertUpdate("DROP TABLE test." + tableName);
    }

Expected: Dereference field dotted.field should return bar

[krvikash]

Thanks, @findepi for pointing this out.