PG1204 opened a new pull request, #7298:
URL: https://github.com/apache/texera/pull/7298
### What changes were proposed in this PR?
If the HuggingFace operator's Result Column Name matches an existing input
column, `getOutputSchemas` reached `Schema.add`, which threw a generic
`RuntimeException("Attribute name '...' already exists in the schema")`, which
is unhelpful, and it doesn't tell the user what to do.
This adds a pre-check in `getOutputSchemas`: if the resolved result column
already exists in the input schema, it throws a clear, actionable message
("Result column '...' already exists in the input table. Choose a different
Result Column Name.") instead of the opaque internal error.
### Any related issues, documentation, discussions?
Closes #7198.
### How was this PR tested?
`sbt "WorkflowOperator/testOnly
org.apache.texera.amber.operator.huggingFace.*"`: passes (124 tests). Added a
test that a colliding result column produces the clear "Result column '...'"
error. scalafmt clean.
### Was this PR authored or co-authored using generative AI tooling?
This PR was co-authored with Claude Opus 4.8 in compliance with ASF policy.
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