DNM: testing index refactor

[cshuo]

Describe the issue this Pull Request addresses

Summary and Changelog

Impact

Risk Level

Documentation Update

Contributor's checklist

• Read through contributor's guide
• Enough context is provided in the sections above
• Adequate tests were added if applicable

[hudi-bot]

CI report:

• 87ebeba Azure: SUCCESS

Bot commands

@hudi-bot supports the following commands:

• @hudi-bot run azure re-run the last Azure build

[codecov-commenter]

Codecov Report

❌ Patch coverage is 89.16667% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.48%. Comparing base (14a549f) to head (87ebeba).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
.../hudi/metadata/index/record/BaseRecordIndexer.java	71.84%	25 Missing and 4 partials ⚠️
...dex/UnsupportedExpressionIndexRecordGenerator.java	42.85%	4 Missing ⚠️
...i/metadata/index/expression/ExpressionIndexer.java	88.23%	1 Missing and 3 partials ⚠️
...hudi/metadata/HoodieBackedTableMetadataWriter.java	95.23%	1 Missing and 2 partials ⚠️
...org/apache/hudi/metadata/index/IndexerFactory.java	85.71%	2 Missing and 1 partial ⚠️
...ata/index/SparkExpressionIndexRecordGenerator.java	80.00%	2 Missing and 1 partial ⚠️
...metadata/index/columnstats/ColumnStatsIndexer.java	94.28%	1 Missing and 1 partial ⚠️
...udi/metadata/index/secondary/SecondaryIndexer.java	90.47%	0 Missing and 2 partials ⚠️
...apache/hudi/metadata/index/files/FilesIndexer.java	95.00%	0 Missing and 1 partial ⚠️
...etadata/index/record/PartitionedRecordIndexer.java	96.42%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18364      +/-   ##
============================================
- Coverage     68.48%   68.48%   -0.01%     
- Complexity    27362    27539     +177     
============================================
  Files          2420     2445      +25     
  Lines        132127   132732     +605     
  Branches      15909    15990      +81     
============================================
+ Hits          90491    90897     +406     
- Misses        34627    34788     +161     
- Partials       7009     7047      +38     

Flag	Coverage Δ
common-and-other-modules	44.56% <63.33%> (+0.18%)	⬆️
hadoop-mr-java-client	45.12% <57.55%> (+<0.01%)	⬆️
spark-client-hadoop-common	48.22% <47.16%> (-0.12%)	⬇️
spark-java-tests	48.82% <74.89%> (-0.10%)	⬇️
spark-scala-tests	44.96% <71.96%> (-0.16%)	⬇️
utilities	38.67% <70.71%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...oodieBackedTableMetadataWriterTableVersionSix.java	76.41% <100.00%> (+0.73%)	⬆️
...apache/hudi/metadata/HoodieMetadataWriteUtils.java	83.49% <100.00%> (+0.90%)	⬆️
.../metadata/SecondaryIndexRecordGenerationUtils.java	88.27% <100.00%> (ø)
...va/org/apache/hudi/metadata/index/BaseIndexer.java	100.00% <100.00%> (ø)
...tadata/index/bloomfilters/BloomFiltersIndexer.java	100.00% <100.00%> (ø)
...data/index/model/IndexPartitionInitialization.java	100.00% <100.00%> (ø)
...ta/index/partitionstats/PartitionStatsIndexer.java	100.00% <100.00%> (ø)
...ache/hudi/metadata/index/record/RecordIndexer.java	100.00% <100.00%> (ø)
...metadata/FlinkHoodieBackedTableMetadataWriter.java	85.71% <100.00%> (-0.34%)	⬇️
.../metadata/JavaHoodieBackedTableMetadataWriter.java	85.18% <100.00%> (-0.53%)	⬇️
... and 20 more

... and 48 files with indirect coverage changes

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