Use table alias is specified when selecting all fields of a type

Author: mythz

src/ServiceStack.OrmLite/Expressions/SqlExpression.cs

@@ -2031,7 +2031,12 @@ protected virtual object VisitParameter(ParameterExpression p)
         {
             var paramModelDef = p.Type.GetModelDefinition();
             if (paramModelDef != null)
-                return new SelectList(DialectProvider.GetColumnNames(paramModelDef, paramModelDef.ModelName));
+            {
+                var tablePrefix = paramModelDef == ModelDef && TableAlias != null
+                    ? TableAlias
+                    : paramModelDef.ModelName;
+                return new SelectList(DialectProvider.GetColumnNames(paramModelDef, tablePrefix));
+            }
 
             return p.Name;
         }

tests/ServiceStack.OrmLite.Tests/Expression/SqlExpressionTests.cs

@@ -665,10 +665,10 @@ public void Can_select_subselect()
                     db.Insert(new LetterFrequency { Letter = letter }, selectIdentity: true));
 
                 var q = db.From<LetterFrequency>(db.TableAlias("x"));
-                q.Where(x => x.Letter == Sql.Custom(q.Column<LetterFrequency>(c => c.Letter, true)));
+                q.Where(x => x.Letter == Sql.TableAlias(x.Letter, "obj"));
                 var subSql = q.Select(Sql.Count("*")).ToSelectStatement();
 
-                var rows = db.Select<Dictionary<string, object>>(db.From<LetterFrequency>()
+                var rows = db.Select<Dictionary<string, object>>(db.From<LetterFrequency>(db.TableAlias("obj"))
                     .Where(x => x.Letter == "C")
                     .Select(x => new {
                         x,