class BitMapColumn extends BaseBitmapColumn {

    @Override
    public boolean isReadable() {
        initIndexReader();
        boolean readable = indexReader.isReadable();
        if (indexLocation.getStoreType().isPersistent()) {
            IoUtil.release(indexReader);
        }
        indexReader = null;
        return readable;
    }

    public  BitMapColumn(IResourceLocation parent);

}