GaussDB Kernel 503
- Adapted Ustore to distributed deployment/parallel query/global temporary table/full vacuum/column constraints DEFERRABLE and INITIALLY DEFERRED.
- Added the online index rebuild function to Ustore.
- Enhanced B-tree empty page estimation for Ustore to improve the cost estimation accuracy of an optimizer.
- Added the storage engine reliability verification framework Diagnose Page/Page Verify to Ustore.
- Enhanced the view parsing, detection, and repair related to Ustore.
- Enhanced the WAL locating capability for Ustore. The gs_redo_upage system view is added to support constant replay of a single page and obtain and print any historical page, accelerating fault locating for damaged pages.
- Extended the Ustore transaction directory's physical format for transaction slots for space reuse within a transaction.
- Added the online index creation function for Ustore.
- Adapted Ustore to the flashback function and ultimate RTO.
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