lexer.nextToken();
acceptIdentifier("SETS");
accept(Token.LPAREN);
exprParser.exprList(groupingSet.getParameters(), groupingSet);
accept(Token.RPAREN);
groupBy.addItem(groupingSet);
} else {
groupBy.addItem(this.exprParser.expr());
}
if (!(lexer.token() == (Token.COMMA))) {