Fix

Author: bahusoid

src/NHibernate/Hql/Ast/ANTLR/HqlSqlWalker.cs

@@ -832,16 +832,6 @@ void CreateFromJoinElement(
 
 					HandleWithFragment(fromElement, with);
 				}
-
-				if (fromElement.Parent == null)
-				{
-					// Most likely means association join is used in invalid context
-					// I.e. in subquery: from EntityA a where exists (from EntityB join a.Assocation)  
-					// Maybe we should throw exception instead
-					fromElement.FromClause.AddChild(fromElement);
-					if (fromElement.IsImplied)
-						fromElement.JoinSequence.SetUseThetaStyle(true);
-				}
 			}
 
 			if ( log.IsDebugEnabled() )
@@ -930,7 +920,7 @@ private static string GetPropertyPath(DotNode dotNode, IASTNode alias)
 			return lhs.Path + "." + path;
 		}
 
-		IASTNode CreateFromElement(string path, IASTNode pathNode, IASTNode alias, IASTNode propertyFetch)
+		FromElement CreateFromElement(string path, IASTNode pathNode, IASTNode alias, IASTNode propertyFetch)
 		{
 			FromElement fromElement = _currentFromClause.AddFromElement(path, alias);
 			SetPropertyFetch(fromElement, propertyFetch, alias);

src/NHibernate/Hql/Ast/ANTLR/HqlSqlWalker.g

@@ -266,10 +266,14 @@ fromElementList @init{
 
 fromElement! 
 @init {
-   IASTNode fromElement = null;
+   FromElement fromElement = null;
 }
 	// A simple class name, alias element.
-	: ^(RANGE p=path (a=ALIAS)? (pf=propertyFetch)? ) { fromElement = CreateFromElement($p.p, $p.tree, $a, $pf.tree); }
+	: ^(RANGE p=path (a=ALIAS)? (pf=propertyFetch)? ) 
+	{
+	 fromElement = CreateFromElement($p.p, $p.tree, $a, $pf.tree);
+	 fromElement.JoinSequence.SetUseThetaStyle(true);
+	}
 		-> {fromElement != null}? ^({fromElement})
 		->
 	| je=joinElement 

src/NHibernate/Hql/Ast/ANTLR/Tree/FromClause.cs

@@ -447,6 +447,11 @@ internal void FinishInit()
 					dependentElement.Parent.InsertChild(index, item);
 				}
 			}
+
+			if (_appendFromElements.Count > 0)
+			{
+				_fromElements[0].JoinSequence.SetUseThetaStyle(true);
+			}
 			_appendFromElements.Clear();
 		}
 

src/NHibernate/Hql/Ast/ANTLR/Tree/FromElement.cs

@@ -711,8 +711,7 @@ public void SetOrigin(FromElement origin, bool manyToMany)
 			}
 			else
 			{
-				// Otherwise, the destination node was implied by the FROM clause and the FROM clause processor
-				// will automatically add it in the right place.
+				FromClause.AppendFromElement(this);
 			}
 		}
 

src/NHibernate/Hql/Ast/ANTLR/Tree/FromElementFactory.cs

@@ -321,7 +321,7 @@ public FromElement CreateEntityJoin(
 				//      1) 'elem' is the "root from-element" in correlated subqueries
 				//      2) The DotNode.useThetaStyleImplicitJoins has been set to true
 				//          and 'elem' represents an implicit join
-				if (elem.FromClause != elem.Origin.FromClause || DotNode.UseThetaStyleImplicitJoins)
+				if (DotNode.UseThetaStyleImplicitJoins)
 				{
 					// the "root from-element" in correlated subqueries do need this piece
 					elem.Type = HqlSqlWalker.FROM_FRAGMENT;