Cleanup guessed parameters handling in hql (#3255)

Partial revert of no longer needed logic from #2964 (obsoleted by #2723)

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

@@ -58,7 +58,6 @@ public partial class HqlSqlWalker
 		private readonly LiteralProcessor _literalProcessor;
 
 		private readonly IDictionary<string, string> _tokenReplacements;
-		private readonly IDictionary<IParameterSpecification, IType> _guessedParameterTypes = new Dictionary<IParameterSpecification, IType>();
 
 		private JoinType _impliedJoinType;
 
@@ -93,21 +92,6 @@ public override void ReportError(RecognitionException e)
 			_parseErrorHandler.ReportError(e);
 		}
 
-		internal IStatement Transform()
-		{
-			var tree = (IStatement) statement().Tree;
-			// Use the guessed type in case we weren't been able to detect the type
-			foreach (var parameter in _parameters)
-			{
-				if (parameter.ExpectedType == null && _guessedParameterTypes.TryGetValue(parameter, out var guessedType))
-				{
-					parameter.ExpectedType = guessedType;
-				}
-			}
-
-			return tree;
-		}
-
 		/*
 		protected override void Mismatch(IIntStream input, int ttype, BitSet follow)
 		{
@@ -1176,7 +1160,6 @@ IASTNode GenerateNamedParameter(IASTNode delimiterNode, IASTNode nameNode)
 				// when the parameter is used as an argument.
 				if (isGuessedType)
 				{
-					_guessedParameterTypes[paramSpec] = type;
 					parameter.GuessedType = type;
 				}
 				else

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

@@ -651,8 +651,7 @@ public IStatement Translate()
 
 				try
 				{
-					// Transform the tree.
-					_resultAst = hqlSqlWalker.Transform();
+					_resultAst = (IStatement) hqlSqlWalker.statement().Tree;
 				}
 				finally
 				{