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Add upper bound support for forward scans in MultiScan (#13723)

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Summary:
Respect the scan upper bound/limit, if specified, in `MultiScan`. This applies to block based table and other native RocksDB SSTs. In order to properly support it, the `MultiScan` object caches the `ReadOptions` passed by the user and sets the `iterate_upper_bound` as appropriate. We optimize for the case of either all scans specifying the upper bound, or none of them. In case of mixed scans, we reallocate the DB iterator anytime `ReadOptions` has to be updated.

Tests:
New unit tests in `db_iterator_test`

Pull Request resolved: https://github.com/facebook/rocksdb/pull/13723

Reviewed By: cbi42

Differential Revision: D77385049

Pulled By: anand1976

fbshipit-source-id: 9c02d125770cbedbe6e8c10767ba537e7f7540e1
This commit is contained in:
anand76
2025-06-26 12:19:16 -07:00
committed by Facebook GitHub Bot
parent fd95bc8f5a
commit 8b84390517
10 changed files with 317 additions and 33 deletions
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@@ -88,6 +88,7 @@ cpp_library_wrapper(name="rocksdb_lib", srcs=[
"db/memtable_list.cc",
"db/merge_helper.cc",
"db/merge_operator.cc",
"db/multi_scan.cc",
"db/output_validator.cc",
"db/periodic_task_scheduler.cc",
"db/range_del_aggregator.cc",