TheR1sing3un

[SUPPORT] Introduce in-memory-cache for ExternalSpillableMap

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**_Tips before filing an issue_** - Have you gone through our [FAQs](https://hudi.apache.org/learn/faq/)? - Join the mailing list to engage in conversations and get faster support at [email protected]. - If you...

### Change Logs _Describe context and summary for this change. Highlight if any code was copied._ jira https://issues.apache.org/jira/browse/HUDI-8084 Still work in progress. ### Impact _Describe any public API or user-facing...

[HUDI-8382] Improve MOR-Snapshot-Query performance for COW like table

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In some cases, a MOR table's latest (or view at time-travel specified instant) file-slices all have only base-file but empty log-files. When performs Snapshot-Query for these tables, we can regard...

[HUDI-8084] Support Sort Merge Join Compaction

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### Change Logs Support Sort Merge Join Compaction With Higher Performance ### Impact none ### Risk level (write none, low medium or high below) none ### Documentation Update none ###...