branch-4.1: [improvement](function) Add dictionary fast path for day and week arithmetic #67184 - #67233
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…thmetic (#67184) `days_add`, `days_sub`, `weeks_add`, and `weeks_sub` on DATEV2 and DATETIMEV2 currently use the generic `DateV2Value::date_add_interval` path for every row. That path constructs a `TimeInterval`, converts the date through second-level arithmetic, and rebuilds date and time fields even though day and week intervals only move the date part. This PR adds an inline `DateV2Value::date_add_days` fast path. Dates in the existing 1900-2039 day-offset dictionary use direct day-number and reverse-date lookups; inputs or results outside that dictionary retain the generic implementation. DATETIMEV2 keeps its time fields unchanged, and result range checks preserve the existing out-of-range behavior. An author microbenchmark measured approximately 8.8 ns to 2.6 ns per row for clustered dates and 8.8 ns to 3.5 ns for dates spread across 1950-2030. Differential coverage compares the new helper with the generic implementation across the supported date domain. Focused function tests cover leap years, boundaries, large deltas, DATEV2, DATETIMEV2, add/subtract paths, and out-of-range results. ### Release note None ### Check List (For Author) - Test - [x] Unit Test - [ ] Regression test - [ ] Manual test - [ ] No need to test or manual test - Behavior changed: - [x] No - [ ] Yes - Does this need documentation? - [x] No - [ ] Yes Validation: - `./run-be-ut.sh --run --filter='VDateTimeValueTest.date_add_days_matches_date_add_interval:VTimestampFunctionsTest.days_add_v2_test:VTimestampFunctionsTest.days_add_v2_boundary_test:VTimestampFunctionsTest.days_sub_v2_test:VTimestampFunctionsTest.weeks_add_v2_test:VTimestampFunctionsTest.weeks_add_v2_boundary_test:VTimestampFunctionsTest.weeks_sub_v2_test' -j16` — 7 tests passed under ASAN_UT. - `build-support/check-build-hygiene.sh` — passed. - `build-support/clang-format.sh`, `build-support/check-format.sh`, and `git diff --check origin/master...HEAD` — passed. - `build-support/run-clang-tidy.sh --base origin/master --build-dir be/ut_build_ASAN` — no diagnostics on changed ranges after the targeted suppression for GTest macro expansion; the overall command remains non-zero because of pre-existing diagnostics outside the diff and toolchain header-resolution errors such as missing `stddef.h`.
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Cherry-picked from #67184