[Data] Add descriptive error if user tries to download from invalid column #56852
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Signed-off-by: Balaji Veeramani <bveeramani@berkeley.edu>
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This pull request improves the user experience by providing a more descriptive error message when download() is used with a non-existent column. The implementation is on the right track, but the fix is incomplete as it doesn't cover all code paths. The new check is only added to PartitionActor, which is bypassed in certain scenarios like chained download operations. I've left a detailed comment on how to make the fix comprehensive by adding a similar check in another location and suggested a small refactoring to avoid code duplication.
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| "Ray Data tried to download URIs from a column named " | ||
| f"{self._uri_column_name!r}, but a column with that name doesn't " | ||
| "exist. Is the specified download column correct?" | ||
| ) |
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Bug: Column Check Fails on Non-PyArrow Tables
The column existence check accesses block.column_names before the block is guaranteed to be a PyArrow table. If the input isn't a PyArrow table (e.g., a pandas DataFrame), this can raise an AttributeError or lead to incorrect results.
marcostephan
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Sep 24, 2025
…olumn (ray-project#56852) <!-- Thank you for your contribution! Please review https://github.com/ray-project/ray/blob/master/CONTRIBUTING.rst before opening a pull request. --> <!-- Please add a reviewer to the assignee section when you create a PR. If you don't have the access to it, we will shortly find a reviewer and assign them to your PR. --> ## Why are these changes needed? <!-- Please give a short summary of the change and the problem this solves. --> **Before** > KeyError: 'Field "eggs" does not exist in schema' **After** > ValueError: Ray Data tried to download URIs in a column named 'eggs', but a column with that name doesn't exist. Is the specified download column correct? ## Related issue number <!-- For example: "Closes ray-project#1234" --> ## Checks - [ ] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [ ] I've run `scripts/format.sh` to lint the changes in this PR. - [ ] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [ ] Unit tests - [ ] Release tests - [ ] This PR is not tested :( Signed-off-by: Balaji Veeramani <bveeramani@berkeley.edu> Signed-off-by: Marco Stephan <marco@magic.dev>
elliot-barn
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Sep 27, 2025
…olumn (#56852) <!-- Thank you for your contribution! Please review https://github.com/ray-project/ray/blob/master/CONTRIBUTING.rst before opening a pull request. --> <!-- Please add a reviewer to the assignee section when you create a PR. If you don't have the access to it, we will shortly find a reviewer and assign them to your PR. --> ## Why are these changes needed? <!-- Please give a short summary of the change and the problem this solves. --> **Before** > KeyError: 'Field "eggs" does not exist in schema' **After** > ValueError: Ray Data tried to download URIs in a column named 'eggs', but a column with that name doesn't exist. Is the specified download column correct? ## Related issue number <!-- For example: "Closes #1234" --> ## Checks - [ ] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [ ] I've run `scripts/format.sh` to lint the changes in this PR. - [ ] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [ ] Unit tests - [ ] Release tests - [ ] This PR is not tested :( Signed-off-by: Balaji Veeramani <bveeramani@berkeley.edu> Signed-off-by: elliot-barn <elliot.barnwell@anyscale.com>
dstrodtman
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Oct 6, 2025
…olumn (#56852) <!-- Thank you for your contribution! Please review https://github.com/ray-project/ray/blob/master/CONTRIBUTING.rst before opening a pull request. --> <!-- Please add a reviewer to the assignee section when you create a PR. If you don't have the access to it, we will shortly find a reviewer and assign them to your PR. --> ## Why are these changes needed? <!-- Please give a short summary of the change and the problem this solves. --> **Before** > KeyError: 'Field "eggs" does not exist in schema' **After** > ValueError: Ray Data tried to download URIs in a column named 'eggs', but a column with that name doesn't exist. Is the specified download column correct? ## Related issue number <!-- For example: "Closes #1234" --> ## Checks - [ ] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [ ] I've run `scripts/format.sh` to lint the changes in this PR. - [ ] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [ ] Unit tests - [ ] Release tests - [ ] This PR is not tested :( Signed-off-by: Balaji Veeramani <bveeramani@berkeley.edu> Signed-off-by: Douglas Strodtman <douglas@anyscale.com>
justinyeh1995
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Oct 20, 2025
…olumn (ray-project#56852) <!-- Thank you for your contribution! Please review https://github.com/ray-project/ray/blob/master/CONTRIBUTING.rst before opening a pull request. --> <!-- Please add a reviewer to the assignee section when you create a PR. If you don't have the access to it, we will shortly find a reviewer and assign them to your PR. --> ## Why are these changes needed? <!-- Please give a short summary of the change and the problem this solves. --> **Before** > KeyError: 'Field "eggs" does not exist in schema' **After** > ValueError: Ray Data tried to download URIs in a column named 'eggs', but a column with that name doesn't exist. Is the specified download column correct? ## Related issue number <!-- For example: "Closes ray-project#1234" --> ## Checks - [ ] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [ ] I've run `scripts/format.sh` to lint the changes in this PR. - [ ] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [ ] Unit tests - [ ] Release tests - [ ] This PR is not tested :( Signed-off-by: Balaji Veeramani <bveeramani@berkeley.edu>
landscapepainter
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Nov 17, 2025
…olumn (ray-project#56852) <!-- Thank you for your contribution! Please review https://github.com/ray-project/ray/blob/master/CONTRIBUTING.rst before opening a pull request. --> <!-- Please add a reviewer to the assignee section when you create a PR. If you don't have the access to it, we will shortly find a reviewer and assign them to your PR. --> ## Why are these changes needed? <!-- Please give a short summary of the change and the problem this solves. --> **Before** > KeyError: 'Field "eggs" does not exist in schema' **After** > ValueError: Ray Data tried to download URIs in a column named 'eggs', but a column with that name doesn't exist. Is the specified download column correct? ## Related issue number <!-- For example: "Closes ray-project#1234" --> ## Checks - [ ] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [ ] I've run `scripts/format.sh` to lint the changes in this PR. - [ ] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [ ] Unit tests - [ ] Release tests - [ ] This PR is not tested :( Signed-off-by: Balaji Veeramani <bveeramani@berkeley.edu>
Future-Outlier
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Dec 7, 2025
…olumn (ray-project#56852) <!-- Thank you for your contribution! Please review https://github.com/ray-project/ray/blob/master/CONTRIBUTING.rst before opening a pull request. --> <!-- Please add a reviewer to the assignee section when you create a PR. If you don't have the access to it, we will shortly find a reviewer and assign them to your PR. --> ## Why are these changes needed? <!-- Please give a short summary of the change and the problem this solves. --> **Before** > KeyError: 'Field "eggs" does not exist in schema' **After** > ValueError: Ray Data tried to download URIs in a column named 'eggs', but a column with that name doesn't exist. Is the specified download column correct? ## Related issue number <!-- For example: "Closes ray-project#1234" --> ## Checks - [ ] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [ ] I've run `scripts/format.sh` to lint the changes in this PR. - [ ] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [ ] Unit tests - [ ] Release tests - [ ] This PR is not tested :( Signed-off-by: Balaji Veeramani <bveeramani@berkeley.edu> Signed-off-by: Future-Outlier <eric901201@gmail.com>
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Why are these changes needed?
Before
After
Related issue number
Checks
git commit -s) in this PR.scripts/format.shto lint the changes in this PR.method in Tune, I've added it in
doc/source/tune/api/under thecorresponding
.rstfile.