public static ZoneId getDefaultZoneId(Types.NestedField expireField) {
    Type type = expireField.type();
    if (type.typeId() == Type.TypeID.STRING) {
      return ZoneId.systemDefault();
    }
    return ZoneOffset.UTC;
  }
Create a filter expression for expired files for the `FILE` level. For the `PARTITION` level,
we need to collect the oldest files to determine if the partition is obsolete, so we will not
filter for expired files at the scanning stage

@param expirationConfig expiration configuration
@param expireTimestamp expired timestamp
amoro-ams/src/main/java/org/apache/amoro/server/optimizing/maintainer/IcebergTableMaintainer.java