Fix unary operators parsing

src/Parsers/ExpressionListParsers.cpp

@@ -2614,9 +2614,18 @@ Action ParserExpressionImpl::tryParseOperand(Layers & layers, IParser::Pos & pos
 
     if (cur_op != unary_operators_table.end())
     {
-        layers.back()->pushOperator(cur_op->second);
+        if (pos->type == TokenType::OpeningRoundBracket)
+        {
+            ++pos;
+            auto identifier = std::make_shared<ASTIdentifier>(cur_op->second.function_name);
+            layers.push_back(getFunctionLayer(identifier, layers.front()->is_table_function));
             return Action::OPERAND;
         }
+        else
+        {
+            layers.back()->pushOperator(cur_op->second);
+        }
+    }
 
     auto old_pos = pos;
     auto current_checkpoint = layers.back()->current_checkpoint;

tests/queries/0_stateless/02920_unary_operators_functions.reference

@@ -0,0 +1 @@
+2

tests/queries/0_stateless/02920_unary_operators_functions.sql

@@ -0,0 +1 @@
+SELECT NOT (0) + NOT (0);