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pr: [#49328](https://github.com/milvus-io/milvus/pull/49328) pr: [#49724](https://github.com/milvus-io/milvus/pull/49724) pr: [#49763](https://github.com/milvus-io/milvus/pull/49763) pr: [#49698](https://github.com/milvus-io/milvus/pull/49698) issue: [#49241](https://github.com/milvus-io/milvus/issues/49241) issue: [#49746](https://github.com/milvus-io/milvus/issues/49746) issue: [#49634](https://github.com/milvus-io/milvus/issues/49634) ## Summary Backport the 2.6 partial update op series to `hotfix-2.6.16`: - support `ARRAY_APPEND` and `ARRAY_REMOVE` partial update ops for Array fields - expose `fieldOps` through REST upsert - preserve existing Array rows when an op payload row is null ## Target branch Base branch: `hotfix-2.6.16` ## Cherry-picks - `5849977c408be2abd063d13c318e970bb4515f06` from [#49328](https://github.com/milvus-io/milvus/pull/49328) - `017ee8e5d97ec891c442489b1354b60676ca3b15` from [#49724](https://github.com/milvus-io/milvus/pull/49724) - `4e10473389843ff2cedc1911083af5a93fa83ec6` from [#49763](https://github.com/milvus-io/milvus/pull/49763) - `824c642c71154952bf70eaaf7b57cbcd7d08e67f` backports the applicable WAL test/recovery stabilization from `73dc8d4034fd352f5c69fd47266fccc062704feb` / [#49698](https://github.com/milvus-io/milvus/pull/49698) after omitting newer rate-limit API changes that do not exist on `hotfix-2.6.16` The partial update cherry-picks applied cleanly on top of `milvus/hotfix-2.6.16`. ## Additional revert - `2753c8defc7a860446d1f5f76b11a50c3cc71550` reverts `8ae21f715094abc92e00369e89a7208681eecfed` to restore the 2.6.16 build environment image version after CI reported Conan 2.x in the newer image. ## Validation - `git diff --check milvus/hotfix-2.6.16...HEAD` - attempted targeted Go test for `internal/streamingnode/server/wal/adaptor`, blocked locally because this worktree lacks `rocksdb.pc` and `milvus_core.pc` PR CI is the validation gate for this backport. --------- Signed-off-by: Wei Liu <wei.liu@zilliz.com> Signed-off-by: Zhen Ye <chyezh@outlook.com> Co-authored-by: Zhen Ye <chyezh@outlook.com>