} else if (lexer.token() == (Token.BETWEEN)) {
lexer.nextToken();
SQLExpr beginExpr = primary();
accept(Token.AND);
SQLExpr endExpr = primary();
expr = new SQLBetweenExpr(expr, beginExpr, endExpr);
} else if (lexer.token() == (Token.IS)) {
lexer.nextToken();
if (lexer.token() == (Token.NOT)) {
lexer.nextToken();