Make modelDef, tableDefs and IsFieldName() protected

Author: mythz

src/ServiceStack.OrmLite/Expressions/SqlExpression.Join.cs

@@ -9,7 +9,7 @@ namespace ServiceStack.OrmLite
 {
     public abstract partial class SqlExpression<T> : ISqlExpression
     {
-        List<ModelDefinition> tableDefs = new List<ModelDefinition>();
+        protected List<ModelDefinition> tableDefs = new List<ModelDefinition>();
 
         public bool IsJoinedTable(Type type)
         {

src/ServiceStack.OrmLite/Expressions/SqlExpression.cs

@@ -37,7 +37,7 @@ public abstract partial class SqlExpression<T> : ISqlExpression, IHasUntypedSqlE
         protected bool useFieldName = false;
         protected bool selectDistinct = false;
         protected bool CustomSelect { get; set; }
-        private ModelDefinition modelDef;
+        protected ModelDefinition modelDef;
         public bool PrefixFieldWithTableName { get; set; }
         public bool WhereStatementWithoutWhereString { get; set; }
         public IOrmLiteDialectProvider DialectProvider { get; set; }
@@ -1755,7 +1755,7 @@ protected string RemoveQuoteFromAlias(string exp)
             return exp;
         }
 
-        protected bool IsFieldName(object quotedExp)
+        protected virtual bool IsFieldName(object quotedExp)
         {
             var fieldExpr = quotedExp.ToString().StripTablePrefixes();
             var unquotedExpr = fieldExpr.StripQuotes();