public void close() {
    positionMap = null;
    try {
      if (eqPredicate != null) {
        eqPredicate.close();
      }
    } catch (IOException e) {
      LOG.error("", e);
    }
    eqPredicate = null;
  }
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