diff --git a/parser.cpp b/parser.cpp
index 7d63d4b..38ce5dd 100644
--- a/parser.cpp
+++ b/parser.cpp
@@ -433,39 +433,39 @@ namespace usql {
 
 	    // function call
 	    if (token_typcol == TokenType::identifier && m_lexer.nextTokenType() == TokenType::open_paren) {
-		std::string function_name = m_lexer.consumeToken(TokenType::identifier).token_string;
-		std::vector<std::unique_ptr<Node>> pars;
+			std::string function_name = m_lexer.consumeToken(TokenType::identifier).token_string;
+			std::vector<std::unique_ptr<Node>> pars;
 
-		m_lexer.skipToken(TokenType::open_paren);
-		while (m_lexer.tokenType() != TokenType::close_paren && m_lexer.tokenType() != TokenType::eof) {
-			pars.push_back(parse_expression());
-			m_lexer.skipTokenOptional(TokenType::comma);
-		}
-		m_lexer.skipToken(TokenType::close_paren);
-		return std::make_unique<FunctionNode>(function_name, std::move(pars));
+			m_lexer.skipToken(TokenType::open_paren);
+			while (m_lexer.tokenType() != TokenType::close_paren && m_lexer.tokenType() != TokenType::eof) {
+				pars.push_back(parse_expression());
+				m_lexer.skipTokenOptional(TokenType::comma);
+			}
+			m_lexer.skipToken(TokenType::close_paren);
+			return std::make_unique<FunctionNode>(function_name, std::move(pars));
 	    }
 
 	    // numbers and strings
 	    std::string tokenString = m_lexer.consumeToken().token_string;
 
 	    if (token_typcol == TokenType::int_number)
-		return std::make_unique<IntValueNode>(std::stoi(tokenString));
+			return std::make_unique<IntValueNode>(std::stoi(tokenString));
 	    if (token_typcol == TokenType::double_number)
-		return std::make_unique<DoubleValueNode>(std::stod(tokenString));
+			return std::make_unique<DoubleValueNode>(std::stod(tokenString));
 	    if (token_typcol == TokenType::string_literal)
-		return std::make_unique<StringValueNode>(tokenString);
+			return std::make_unique<StringValueNode>(tokenString);
 		
 	    // db column
 	    if (token_typcol == TokenType::identifier)
-		return std::make_unique<DatabaseValueNode>(tokenString);
+			return std::make_unique<DatabaseValueNode>(tokenString);
 
 	    // null
 	    if (token_typcol == TokenType::keyword_null)
-		return std::make_unique<NullValueNode>();
+			return std::make_unique<NullValueNode>();
 
 	    // true / false
 	    if (token_typcol == TokenType::keyword_true || token_typcol == TokenType::keyword_false)
-		return std::make_unique<BooleanValueNode>(token_typcol == TokenType::keyword_true);
+			return std::make_unique<BooleanValueNode>(token_typcol == TokenType::keyword_true);
 
 	    // token * for count(*)
 	    if (token_typcol == TokenType::multiply)