private CloseableIterable<Record> openPosDeletes(DeleteFile file) {
    return openFile(file, POS_DELETE_SCHEMA);
  }
Get all delete ids of equality delete files

<p>For example, if there are two equality delete fields, one is [1, 2] and another is [1], the
delete ids will be [1, 2].

@return delete ids
amoro-format-iceberg/src/main/java/org/apache/amoro/io/reader/CombinedDeleteFilter.java