String nameCaseSensitive = columnNames.ceilingKey(nameIc);
for (int i = 0; i < columnNameList.size(); ++i) {
String columnName = columnNameList.get(i);
Type columnType = typeList.get(i);
c.put(columnName.toLowerCase(), new SimpleColumn(columnType, columnName));
}
return new ColumnNamesImpl(nameCaseSensitive, c);
}