var table2CacheFields = new Dictionary<string, List<string[]>>
{
    {
        "Table1", new List<string[]>
            {
                new string[] {"Field1"},
                new string[] {"Field2"},
            }
    },
    {
        "Table2", new List<string[]>
            {
                new string[] {"Field1"},
                new string[] {"Field3", "Field4"},
            }
    },
};