[HUDI-9424] Extract and test merger logic for FileGroupReader#13242

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the-other-tim-brown wants to merge 31 commits intoapache:masterfrom

the-other-tim-brown:merger-and-refactor

Commits on May 23, 2025

initial draft of refactoring, needs unit test
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dedupe ordering field code
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start adding tests
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fix rebase issues
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reduce size of changes, fix schema evolution, handle deletes in a consistent way
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add more testing, standardize delete records
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add more merge tests, fix bugs
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style
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fix update optimization
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add delete testing for custom payload
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add some java docs, ensure consistent ordering value type
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fix use of final
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move conversion to record buffer
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update javadocs
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update comment
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fix conflicts
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add back delete record vs data record processing
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move delete handling before partial merge, update signatures for consistent older/newer ordering
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add delete handling logic to merger and unit tests
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simplify null handling, update unit test
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fix style, use constant
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rename method
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cleanup after rebase
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undo empty record handling
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fix empty
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fix conflicts
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Commits on May 24, 2025

restore doProcess methods for capturing logic for handling outputs of merger, move schema handling to payload case only for efficiency
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add back inner method to keep code more similar to master
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further minimize diff with master
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update javadoc
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add proper message for illegal state exception
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