private static Collection<String> escape(JdbcDialect dialect,Collection<String> cols){
  Collection<String> res=new ArrayList<>(cols.size());
  for (  String col : cols)   res.add(dialect.escape(col));
  return res;
}

private static Collection < String > escape ( JdbcDialect dialect , Collection < String > cols ) { Collection < String > res = new ArrayList < > ( cols . size ( ) ) ; for ( String col : cols ) res . add ( dialect . escape ( col ) ) ; return res ; }
escape collection of column names .
