xuang7 opened a new issue, #7524:
URL: https://github.com/apache/texera/issues/7524
### Feature Summary
Step 6 of the operator-demo video generator: add a controller for the
dataset-selection flow, so source operators can point at a real file and
produce output.
Source operators read from a dataset rather than from an upstream operator.
Their file is chosen through a modal that picks a dataset, a version, and a
file, and only that flow sets a usable file reference on the operator.
### Proposed Solution or Design
Add a new `DatasetControllerBuilder` to the Playwright layer. It drives the
file-selection modal used by source operators.
```
new DatasetControllerBuilder(ctx)
.datasetName(dataset.name)
.datasetVersion(dataset.version)
.file("movies.csv")
.execute()
```
The controller handles:
- opening the file-selection modal,
- selecting the dataset by name,
- selecting the required dataset version,
- selecting the file and confirming the choice,
- waiting for the operator to load the reference and infer its schema.
File selection must go through the modal because it sets the full dataset
URI on the operator. Directly filling the form field only sets a file name and
can overwrite that URI, causing the operator to fail at runtime.
Frontend hooks:
Add stable `data-testid` attributes for the modal controls where needed, and
extend the guard test accordingly.
### Affected Area
_No response_
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