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Add unit test ensuring that if property is set to true then output is…
… sorted on Z-order value. Signed-off-by: Malte Velin <[email protected]> Author: Malte Sølvsten Velin <[email protected]> Date: Sat Dec 28 20:10:01 2024 +0100 Add configuration property to toggle sorting output on Z-order value. Signed-off-by: Malte Velin <[email protected]> commit 82e940f17f51a0ebeaac0b03441b13875da3c439 Author: Fred Storage Liu <[email protected]> Date: Fri Dec 20 17:02:18 2024 -0800 Fix indentation in CloneTableBase (#3996) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Fix indentation in CloneTableBase ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> commit 4dbadbbf8ddd0a12273ac9521d61bc89196dc80d Author: Carmen Kwan <[email protected]> Date: Thu Dec 19 22:39:44 2024 +0100 [Spark] Make Identity Column High Water Mark updates consistent (#3989) #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Currently: - When we do a MERGE, we will always call `setTrackHighWaterMarks` on the transaction. This will have an effect if there is an INSERT clause in the MERGE. - If we `setTrackHighWaterMarks`, we collect the max/min of the column using `DeltaIdentityColumnStatsTracker`. This stats tracker is only invoked on files that are written/rewritten. These min/max values are compared with the existing high watermark. If the high watermark doesn't exist, we will keep as high watermark the largest of the max or the lowest of the min without checking against the starting value of the identity column. - If an identity column did not generate a value yet, the high watermark is None and isn't stored in the table. This is true for GENERATED ALWAYS AS IDENTITY tables when it is empty and true for GENERATED BY DEFAULT AS IDENTITY tables when it only has user inserted values for the identity column. - If you run a MERGE UPSERT that only ends up updating values in a GENERATED BY DEFAULT table that doesn't have a high watermark yet, we will write a new high watermark that is the highest for the updated file, which may be lower than the starting value specified for the identity column. Proposal: - This PR makes all high water mark updates go through the same validation function by default. It will not update the high watermark if it violates the start or the existing high watermark. Exception is if the table already has a corrupted high water mark. - This does NOT prevent the scenario where we automatically set the high watermark for a generated by default column based on user inserted values when it does respect the start. - Previously, we did not do high water mark rounding on the `updateSchema` path. This seems erroneous as the min/max values can be user inserted. We fix that in this PR. - Previously, we did not validate that on SYNC identity, the result of max can be below the existing high water mark. Now, we also do check this invariant and block it by default. A SQLConf has been introduced to allow reducing the high water mark if the user wants. - We add logging to catch bad high water mark. ## How was this patch tested? New tests that were failing prior to this change. ## Does this PR introduce _any_ user-facing changes? No commit ae4982ce267052c526fef638a88ce86f7d85e583 Author: Allison Portis <[email protected]> Date: Thu Dec 19 11:42:13 2024 -0800 [Kernel] Fix flaky test for the Timer class for metrics (#3946) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [X] Kernel - [ ] Other (fill in here) ## Description Fixes a flaky test. ## How was this patch tested? Unit test fix. ## Does this PR introduce _any_ user-facing changes? No. commit da58cad55741313852005cf2d84a7f2e0280bf2b Author: Allison Portis <[email protected]> Date: Wed Dec 18 19:35:07 2024 -0800 [Kernel] Remove CC code from SnapshotManager (#3986) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description We are re-thinking the design of the Coordinated Commits table feature and much of this snapshot code will be refactored. Remove it for now as it greatly complicates our snapshot construction, and hopefully we can be more intentional in our code design/organization when re-implementing it. https://github.com/delta-io/delta/commit/fc81d1247d66cc32e454e985f0cfc81447f897b6 already removed the public interfaces and made it such that `SnapshotImpl::getTableCommitCoordinatorClientHandlerOpt` never returned a handler. ## How was this patch tested? Existing tests should suffice. ## Does this PR introduce _any_ user-facing changes? No. commit 34f02d8858faf2d74465a40c22edb548e0626c05 Author: Cuong Nguyen <[email protected]> Date: Wed Dec 18 14:46:52 2024 -0800 [Spark] Avoid unnecessarily calling update and some minor clean up in tests (#3965) commit 1cd6fed7987ad15e7d8b2d593c4579ce865f4cbe Author: Andreas Chatzistergiou <[email protected]> Date: Wed Dec 18 23:01:54 2024 +0100 [Spark] Drop feature support in DeltaTable Scala/Python APIs (#3952) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> This PR adds drop feature support in the DeltaTable API for both scala and python APIs. ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> Added UTs. ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> Yes. See description. commit baa55187fd32bb4b0f97fd1d2305db4e0dd7d44e Author: Carmen Kwan <[email protected]> Date: Wed Dec 18 20:21:45 2024 +0100 [Spark][TEST-ONLY] More tests updating Identity Column high water mark (#3985) #### Which Delta project/connector is this regarding? - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Test-only PR. Add one more test for updating the identity column high water mark when it not already available. ## How was this patch tested? Test-only PR. ## Does this PR introduce _any_ user-facing changes? No. commit f577290c5dec0b76130397cc0a050f9030b12035 Author: Rahul Shivu Mahadev <[email protected]> Date: Tue Dec 17 13:55:03 2024 -0800 [Spark] Fix auto-conflict handling logic in Optimize to handle DVs (#3981) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Bug: There was an existing long standing bug where the custom conflict detection logic in Optimize does not catch concurrent transactions that add DVs. e.g. AddFile(path='a') -> AddFile(path='a', dv='dv1'). Fix: Updated the conflict resolution to consider a composite key of (path, dvId) instead of just depending on path. ## How was this patch tested? - unit tests ## Does this PR introduce _any_ user-facing changes? no commit fc81d1247d66cc32e454e985f0cfc81447f897b6 Author: Scott Sandre <[email protected]> Date: Fri Dec 13 11:14:09 2024 -0800 [Kernel] Remove Coordinated Commits from public API (#3938) #### Which Delta project/connector is this regarding? - [ ] Spark - [ ] Standalone - [ ] Flink - [X] Kernel - [ ] Other (fill in here) ## Description We are re-thinking the design of the Coordinated Commits table feature (currently still in RFC). Thus, we should remove it from the public Kernel API for Delta 3.3 release. To summarize the changes of this PR - I remove `getCommitCoordinatorClientHandler` from the `Engine` interface - I move various previously `public` CC interfaces and classes to be `internal` now - `SnapshotImpl::getTableCommitCoordinatorClientHandlerOpt` is hardcoded to return an empty optional - Delete failing test suites and unapplicable utils ## How was this patch tested? Existing CI tests. ## Does this PR introduce _any_ user-facing changes? We remove coordinated commits from the public kernel API. commit 2f5673e0432962cb834e103dbc79ce8aea9a4e37 Author: Thang Long Vu <[email protected]> Date: Fri Dec 13 01:09:27 2024 +0100 [Docs] Update documentation for Row Tracking to include Row Tracking Backfill introduced in Delta 3.3 (#3968) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [X] Other (Docs) ## Description - Update the [Row Tracking blog](https://docs.delta.io/latest/delta-row-tracking.html#-limitations). Before, we mention in the limitation that we cannot enable Row Tracking on non-empty tables. Now, with [Row Tracking Backfill release](https://github.com/delta-io/delta/releases/) in Delta 3.3, we are now enable Row Tracking on non-empty tables. - Explicitly mention that you can enable Row Tracking on existing tables from Delta 3.3. <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> ## How was this patch tested? N/A <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? N/A <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> commit 259751b51d73831fd6222d98178091b037ef0d7a Author: Thang Long Vu <[email protected]> Date: Fri Dec 13 01:09:17 2024 +0100 [Docs][3.3] Update documentation for Row Tracking to include Row Tracking Backfill introduced in Delta 3.3 (#3969) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [X] Other (Docs) ## Description - Cherry-pick https://github.com/delta-io/delta/pull/3968 into Delta 3.3. <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> ## How was this patch tested? N/A <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? N/A <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> commit d0be1d7b6c376b5d7cf7fba5daf039a2638cd7b9 Author: Zhipeng Mao <[email protected]> Date: Thu Dec 12 20:01:50 2024 +0100 Add identity column doc (#3935) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description It adds doc for identity column. <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> ## How was this patch tested? Doc change. <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? No. <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> commit fdf887d6104582955ad75d3f7297b36d249d91d1 Author: Zhipeng Mao <[email protected]> Date: Thu Dec 12 19:59:20 2024 +0100 [SPARK] Add test for Identity Column merge metadata conflict (#3971) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description It adds a test for identity column to verify merge will be aborted if high water mark is changed after analysis and before execution. <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> ## How was this patch tested? Test-only. <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? No. <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> commit 58f94afafd16a19644fef7130a46cb8a93d18ec8 Author: Dhruv Arya <[email protected]> Date: Thu Dec 12 10:58:13 2024 -0800 [PROTOCOL][Version Checksum] Remove references to Java-specific Int.MaxValue and Long.MaxValue (#3961) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [X] Other (PROTOCOL) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> Fixes a Version Checksum spec changes introduced in https://github.com/delta-io/delta/pull/3777. The last two bin bounds for Deleted File Count Histogram right now are defined in terms of Java's Int.MaxValue and Long.MaxValue. This PR makes the spec language independent by inlining the actual values of these bounds. ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> N/A ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> No commit 05cdd3cd4752dbb826f6bcfa4ba1d46ef1b246ee Author: Anton Erofeev <[email protected]> Date: Thu Dec 12 17:20:08 2024 +0300 [Kernel] Fix incorrect load protocol and metadata time log (#3964) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [X] Kernel - [ ] Other (fill in here) ## Description Resolves #3948 Fixed incorrect load protocol and metadata time log <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> ## How was this patch tested? Unit tests <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? No <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> commit 19d89f6ba0803b0f4c1826a521c27ababdd50864 Author: Jiaheng Tang <[email protected]> Date: Wed Dec 11 18:28:25 2024 -0800 Update liquid clustering docs (#3958) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [x] Other (docs) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> Add docs for OPTIMIZE FULL, in-place migration, and create table from external location. ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. -->  ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> No commit 30d74a6b8d5a305ce4a6ab625f69d0b9b93e6f92 Author: Carmen Kwan <[email protected]> Date: Wed Dec 11 21:25:09 2024 +0100 [Spark][TEST-ONLY] Identity Column replace tests for partitioned tables (#3960) #### Which Delta project/connector is this regarding? - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Quick follow up for https://github.com/delta-io/delta/pull/3937 Expand test to cover partitioned tables too. ## How was this patch tested? Test only change. New tests and existing tests pass. ## Does this PR introduce _any_ user-facing changes? No. commit 10972577202783720f5e61925ee7d7c6fc204a78 Author: Fred Storage Liu <[email protected]> Date: Wed Dec 11 11:50:01 2024 -0800 Update Delta uniform documentation to include ALTER enabling (#3927) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [x] Other (fill in here) ## Description Update Delta uniform documentation to include ALTER enabling ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> commit 57d0e3b42f60d133db9c4a81a432804803d9955b Author: Fred Storage Liu <[email protected]> Date: Wed Dec 11 07:37:09 2024 -0800 Expose Delta Uniform write commit size in logs (#3898) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Expose Delta Uniform write commit size in logs commit 407d4c99b437636cde2fcc5c52039bb19510bb64 Author: Kaiqi Jin <[email protected]> Date: Wed Dec 11 07:36:30 2024 -0800 Use default partition value during uniform conversion when partition value is missing (#3924) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> Previously, missing <key, value> pair in the partitionValues map was not handled correctly, resulting in a Delta -> Iceberg conversion failure. To fix this, this PR use default value correctly for missing entries in the partitionValues map. ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> Existing tests ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> No commit e3a613dfa550defb86a05a57d9fef52daa86e8da Author: Cuong Nguyen <[email protected]> Date: Tue Dec 10 15:35:16 2024 -0800 [Spark] Pass catalog table to DeltaLog API call sites, part 3 (#3949) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Fix a number of code paths where we want to pass catalog table to the commit coordinator client via DeltaLog API <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> ## How was this patch tested? Unit tests <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? No. <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> commit b39d5b328ffa8e1071fc6aab78cfb345c8f2d8f7 Author: Fred Storage Liu <[email protected]> Date: Tue Dec 10 09:33:33 2024 -0800 Add sizeInBytes API for Delta clone (#3942) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Add sizeInBytes API for Delta clone ## How was this patch tested? existing UT ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> commit 61ac84d4579fdf99465861991f1a0fb697fa0325 Author: Cuong Nguyen <[email protected]> Date: Tue Dec 10 09:07:26 2024 -0800 [SPARK] Clean up vacuum-related code (#3931) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> This PR cleans up a few things + In scala API, use the `VacuumTableCommand` instead of calling `VacuumCommand.gc` directly, + Pass `DeltaTableV2` to `VacuumCommand.gc` instead of `DeltaLog`. + Use `DeltaTableV2` in tests instead of `DeltaLog`. ## How was this patch tested? Unit tests <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> No commit 79e518ba81505384695ec4a71ba0013eeb860646 Author: Johan Lasperas <[email protected]> Date: Tue Dec 10 17:50:10 2024 +0100 [Spark] Allow missing fields with implicit casting during streaming write (#3822) ## Description Follow-up on https://github.com/delta-io/delta/pull/3443 that introduced implicit casting during streaming write to delta tables. The feature was shipped disabled due to a regression found in testing where writing data with missing struct fields start being rejected. Streaming writes are one of the few inserts that allows missing struct fields. This change allows configuring the casting behavior used in MERGE, UPDATE and streaming writes wrt to missing struct fields. ## How was this patch tested? Extensive tests were added in https://github.com/delta-io/delta/pull/3762 in preparation for this changes, covering for all inserts (SQL, dataframe, append/overwrite, ..): - Missing top-level columns and nested struct fields. - Extra top-level columns and nested struct fields with schema evolution. - Position vs. name based resolution for top-level columns and nested struct fields. with e.p. the goal of ensuring that enabling implicit casting in stream writes here doesn't cause any other unwanted behavior change. ## This PR introduces the following *user-facing* changes From the initial PR: https://github.com/delta-io/delta/pull/3443 Previously, writing to a Delta sink using a type that doesn't match the column type in the Delta table failed with `DELTA_FAILED_TO_MERGE_FIELDS`: ``` spark.readStream .table("delta_source") # Column 'a' has type INT in 'delta_sink'. .select(col("a").cast("long").alias("a")) .writeStream .format("delta") .option("checkpointLocation", "<location>") .toTable("delta_sink") DeltaAnalysisException: [DELTA_FAILED_TO_MERGE_FIELDS] Failed to merge fields 'a' and 'a' ``` With this change, writing to the sink now succeeds and data is cast from `LONG` to `INT`. If any value overflows, the stream fails with (assuming default `storeAssignmentPolicy=ANSI`): ``` SparkArithmeticException: [CAST_OVERFLOW_IN_TABLE_INSERT] Fail to assign a value of 'LONG' type to the 'INT' type column or variable 'a' due to an overflow. Use `try_cast` on the input value to tolerate overflow and return NULL instead." ``` commit 8f344098e0601d04f9bd3fa25306569b3d106e06 Author: jackierwzhang <[email protected]> Date: Tue Dec 10 08:49:46 2024 -0800 Fix schema tracking location check condition against checkpoint location (#3939) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description This PR introduces a better way to check if the schema tracking location is under the checkpoint location that would work with arbitrary file systems and paths. ## How was this patch tested? New UT. ## Does this PR introduce _any_ user-facing changes? No commit fdc2c7f7c7367a50de8734cc9b4520cecc5aeadc Author: Rajesh Parangi <[email protected]> Date: Mon Dec 9 17:50:24 2024 -0800 Add Documentation for Vacuum LITE (#3932) #### Which Delta project/connector is this regarding? - [X] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Adds Documentation for Vacuum LITE ## How was this patch tested? N/A ## Does this PR introduce _any_ user-facing changes? NO commit 00fa0ae8a0d2ec9f0e52cbe8ab28274a80e6272b Author: Carmen Kwan <[email protected]> Date: Mon Dec 9 21:02:47 2024 +0100 [Spark][TEST-ONLY] Identity Column high watermark and replace tests (#3937) #### Which Delta project/connector is this regarding? - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description In this PR, we expand the test coverage for identity columns. Specifically, we add more assertions for the high watermarks and cover more test scenarios with replacing tables. ## How was this patch tested? Test-only PR. We expand test coverage. ## Does this PR introduce _any_ user-facing changes? No. commit 7224677acda11eb21103112c8b636963874e9071 Author: Carmen Kwan <[email protected]> Date: Mon Dec 9 20:32:51 2024 +0100 [Spark] Enable Identity column SQLConf (#3936) #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description This PR is part of https://github.com/delta-io/delta/issues/1959 In this PR, we flip the SQLConf that guards the creation of Identity Column from false to true. Without this, we cannot create identity columns in Delta Spark! ## How was this patch tested? Existing tests pass. ## Does this PR introduce _any_ user-facing changes? Yes, it enables the creation of Identity Columns. commit bb3956f0c8e290725d0b6ab02981d2c5ad462c12 Author: Andreas Chatzistergiou <[email protected]> Date: Fri Dec 6 14:51:31 2024 +0100 [Spark] CheckpointProtectionTableFeature base implementation (#3926) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> Base implementation of `CheckpointProtectionTableFeature`. Writers are only allowed to cleanup metadata as long as the can truncate history up to `requireCheckpointProtectionBeforeVersion` in one go. As a second step, the feature can be improved by allowing metadata cleanup even when the invariant above does not hold. Metadata cleanup could be allowed if the client verifies it supports all writer features contained in the history it intends to truncate. This improvement is important to support for providing GDPR compliance. ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> Added tests in `DeltaRetentionSuite`. ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> No. commit da162a097a25524fc97334f47a180257cb487789 Author: Dhruv Arya <[email protected]> Date: Thu Dec 5 17:16:14 2024 -0800 [Protocol] Add a version checksum to the specification (#3777) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [X] Other (PROTOCOL) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> Adds the concept of a Version Checksum to the protocol. This version checksum can be emitted on every commit and stores important bits of information about the snapshot which can later be used to validate the integrity of the delta log. ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> N/A ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> N/A commit 8fb17a0160a937307d6fb9276a77403aeb7efc63 Author: Dhruv Arya <[email protected]> Date: Thu Dec 5 16:58:21 2024 -0800 [Spark][Version Checksum] Read Protocol, Metadata, and ICT directly from the Checksum during Snapshot construction (#3920) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [X] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> Stacked over https://github.com/delta-io/delta/pull/3907. This PR makes the Checksum (if available) the source of truth for Protocol, Metadata, ICT during snapshot construction. This helps us avoid a Spark query and improves performance. ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> Added some test cases to existing suites ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> No commit 1ee278ae23bc08a25c448524264622ba106686cd Author: Allison Portis <[email protected]> Date: Wed Dec 4 15:40:15 2024 -0800 [Kernel][Metrics][PR#4] Adds Counter class (#3906) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [X] Kernel - [ ] Other (fill in here) ## Description Adds a `Counter` that will be used by following PRs to count metrics. ## How was this patch tested? Adds a unit test. ## Does this PR introduce _any_ user-facing changes? No. commit 8cd614107468389a117362f708a540c0263c01e7 Author: Qiyuan Dong <[email protected]> Date: Wed Dec 4 23:21:34 2024 +0100 [Kernel] Add JsonMetadataDomain and RowTrackingMetadataDomain (#3893) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [ ] Spark - [ ] Standalone - [ ] Flink - [x] Kernel - [ ] Other (fill in here) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> This PR adds the following to Delta Kernel Java: - `JsonMetadataDomain.java`: Introduces the base abstract class `JsonMetadataDomain` for metadata domains that use JSON as their configuration string. Concrete implementations, such as `RowTrackingMetadataDomain`, should extend this class to define their specific metadata domain. This class provides utility functions for - serializing to/deserializing from a JSON configuration string - creating a `DomainMetadata` action for committing - creating a specific metadata domain instance from a `SnapshotImpl` - `RowTrackingMetadataDomain.java`: Implements the metadata domain `delta.rowT…
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