Paimon Source and Hudi 1.1 for unpartitioned table data validation fails.

[vinishjail97]

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Please describe the bug 🐞

Error:    ITConversionController.testVariousOperations:266->checkDatasetEquivalence:955->checkDatasetEquivalence:1029->lambda$checkDatasetEquivalence$10:1036 Datasets have different row counts when reading from Spark. Source: PAIMON, Target: HUDI ==> expected: <100> but was: <0>

In Hudi 1.x, all the partition paths from MDT are coming in as empty causing the failures as compared to 0.x.

  protected List<PartitionPath> listPartitionPaths(List<String> relativePartitionPaths) {
    List<String> matchedPartitionPaths;
    try {
      if (isPartitionedTable()) {
        if (queryType == HoodieTableQueryType.INCREMENTAL && incrementalQueryStartTime.isPresent() && !isBeforeTimelineStarts()) {
          HoodieTimeline timelineToQuery = findInstantsInRange();
          matchedPartitionPaths = TimelineUtils.getWrittenPartitions(timelineToQuery);
        } else {
          matchedPartitionPaths = tableMetadata.getPartitionPathWithPathPrefixes(relativePartitionPaths);
        }
      } else {
        matchedPartitionPaths = Collections.singletonList(StringUtils.EMPTY_STRING);
      }
    } catch (IOException e) {
      throw new HoodieIOException("Error fetching partition paths", e);
    }

https://github.com/apache/hudi/blob/master/hudi-common/src/main/java/org/apache/hudi/BaseHoodieTableFileIndex.java#L346

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[vinishjail97]

apache/hudi#17788
Handling external file groups in hudi's MDT.